4l80e max line pressure. TPS will set line pressure vss sets the shift points .

4l80e max line pressure. With the exception of the line pressure.

4l80e max line pressure HOT ROD Staff Writer Sep 19, 2013. Shifts fine automatically or manually, and "locks up" in 3rd, but if shifter is placed in OD (4th gear), the car actually seems to "neutral out" unless transmission temperature is hot. 2003 GMC Sonoma LQ4 6. This raises line pressure 35-40 psi over stock, resulting in firmer shifts and increased transmission torque capacity at all throttle angles. 4L80E-LB1 All the benefits of increased line pressure without overloading the pump at idle; Sonnax is an industry leader in the cutting edge design, manufacture and distribution of the highest quality products to 4L80E Line Pressure Booster. Was wondering on a 4l80e, when the converter is locked and the line pressure is at max, what charge pressure is the converter seeing? Trying to understand the fluid schematic. Your pressure of 50-60 lbs is too low. I see from various sources that the trans pressure on a gauge in psi pretty much right off idle should be nearly max (for that gear) The numbers given in psi, for example You're getting line pressure and TV pressure confused. Originally Posted by Jetn3. Pump/Valve Body. 9 volts to it and get the maximum current; however this is not a good solution, the variation of the force Main/max line pressure is 90 would increasing this be an overall increase? In the thread title you mention 4L80E, and that is why I came in here, to find information about tuning for a 4L80E behind an LT1. I have tried to study the methods myself but I've never messed with an automatic vehichle before and Slight shudder during lockup - 4L80E. If the converter discharge/drain side is limited in any way, the cooler line pressure would be lower yet the thrust would be higher. With the way I previously used to tune the trans for a faster, firmer shift, I would set the shift time to my desired speed, like (. 60-65 forward and 90-100 Reverse, even unplugged, even at full throttle while driving. It looks like the converter is fed from the TCC solenoid which is using line pressure. The current specification is 0. Any suggestions on modifying the current 58, 58, 58, 58, 58, 60, 67, Join Date Aug 2016 Location Texas Posts 222. 1995 K2500 SUBURBAN, LB7 4L80E; 6L80, 6L90; Dodge-Cummins Diesel; Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving Stronger pressure regulator springs raise pressure equal amounts at idle and maximum pressure. welder350fd. hot. Holley has them ramp to 100% duty cycle very early on when using their turbo tunes. lbs. The 4L80e transmission fluid capacity lurks at 6. 3K views 19 replies 6 participants last post by jakeshoe May 26, 2020. 250 sec) and then would adjust the shift pressure just by comfort feel. The set time is a bit slow on this video because we forgot to max out the line pressure with the pressure control solenoid. Or whatever felt like it worked with that shift time. I'd be well wary of running at full line pressure. Having said that, I believe the TCC solenoid regulates line pressure based on estimated engine torque. It depends how much load, weight, torque the engine can make, the size of tires, The lower the amperage to the EPC the higher the line pressure will go, to some max set internally by the trans setup and boost/pressure regulator valve. Thread starter EVH; Start date Jun 23, 2021; E. It shifts very nicely when in SD mode but as soon as I re-enable the MAF it loses the firmness - I assume due to the line pressure following the tables? I'm hesitant to add too much shift pressure as I don't know what's safe/not, this is the first -80E I've messed with but it'd sure be nice if this thing would Eventually throws p1870 code and trans goes to limp mode and Max line pressure. Jump to Latest 14K views 3 replies 3 participants last post by Crosley May 14, 2009. Pressure gauge is hooked to the line pressure port of the trans. All, I've been digging for a solution on this, and it appears that some have issues w/ P59 and some don't. Maximum engine input torque for the 4L80 is 440 ft. 86 posts · Joined 2016 Add to quote; Only show this user #1 · Oct 31, 2024. Warning: apply parking brake and The trans builder said to have all the line pressure in by 25% throttle or so. If there was a way to monitor exact internal pressure it very well may be what GM Powertrain spec is. If you get a p1810 code, it commands max line pressure for your trans. This is after about 20 minutes of driving, the tran Maximum line presssure; No 4th; 2nd Gear starts w/MIL on; Line Pressure Booster Kit 4L80E-LB1. Max Line Pressure on P0101, P0102, and P0103 is only on the 99-02 P01 PCM truck calibrations and it is only enabled on the 99-00s. Having looked at other Terminator X files in the wild, they're pretty much the same. Also, I read that this problem can be intensified when it sits for a while and there is torque converter drain back. cold and 65psi. I would start with just verifying all pinouts from trans connector and PCM, there are changes from 4L60e to 4L80e. anyhow, with the highest line pressure settings they could get, the shifts got firm but not enough to break the tires loose on a 4L80E TR220 cam RevMax 2800rpm stall converter Schoenfeld LT Headers Nelson tuned Also with this code ur tranny will b at max line pressure causing harsh shifts and can blow trans seals in drums. The valve body separator plate and accumulator mods have a large part in the shift Heavy Duty Truck Basic Build. Upshift and Downshift Pressure Modifier: These tables are a modifier to the returned base shift pressure tables. GM 4L60 transmission calibrations command line pressure based on engine calculated torque output, not TPS settings so I don't know how you are going to convert those To start, this is a turbo (S366) third gen 5. Figure 2 is of 2013 Dodge RAM 6. The Line Pressure transducer harness connector is simply plug & play into the optional Holley EFI 554-136 500 PSI Pressure Transducer. So far I've been able to determine with HP and another software that PWM is disabled in this tranny. There is nowhere in the trans diag page to disable the Maf fail - max line pressure setup. These will often result in poor line pressure, high temperatures, flared shifts and other generic drivability concerns. The 4L80E also comes with a lock-up pressure plate for direct, In the TunerStudioMS interface, the 0-60% signal has been converted to a 40-100% signal, where 100% means maximum line pressure, and 40% means minimum line pressure. yup i tried this. I think lines are 5/16" but could be 3/8" not where I can check right now. I also increased line pressure and shortened shift time. when your credit cards are max\'ed-call and raise the limits. The question is a bit premature as I have yet to get an actual cooler line pressure reading. See if you can get a manual reading of range pressures for Low, Second Drive OD and Reverse. 4L80E behind a 2001 5. GM units work off amperage. At max line the normal pressure in the cooler, not the converter is usually 80 psi. The 4L80e is 26. Operation: Max Line Pressure. maximum voltage or current for 4L80e line pressure control A voltage source in not a good way to control this electronic 4L80 Trans Cooler Line Pressure. I haven't messed much with the 80's, but I know in 400's different mfg's use different sized oil passages in the input shafts. Sonnax lube regulated pressure regulator valve 34200-14K provides a significant increase in cooler flow under low RPM and high pressure conditions that benefits all vehicles, and eliminates the need for I'm trying to firm up the shifts on the 4L80E in my swap truck. If you're slipping under max line pressure, in either first or second, trans has to come out for overhaul. I think that there is a chart somewhere indicating amperage to the force motor vs line pressure. Drop-in TCC Apply Limit Valve Kit 22771A-44K. They also feature Whenever the P1810 trouble code has been thrown, the transmissions line pressure is at it’s maximum. Always replace the 3rd/Reverse checkball sleeve inner O-ring (101A and B, Figure 1, Page 2) and inspect AFL valve bore (108, Figure 1, Fused 12v+ should be supplied to all solenoids and the PCM controls the ground circuits. Jump to Latest 7. com/channel/UCcz3-NrTLE0G_PY_lceSQAQInstagram: littlevictoryfabcoLO A voltage source in not a good way to control this electronic pressure control. Last edited by 72tutone; 11-11-2020 the return on the cooler lines just dumps back into the tranny like AnimalAin said. where they tried 5 different controllers with a basic stock 4L80 in a 69 camaro. Smart-Tech ® Overrun Clutch Valve Kit 34200-40K Details; Lube Regulated Pressure Regulator Valve 34200-14K*; Line Pressure Booster Kit 4L80E-LB1*; Internal. Moderators: jsmcortina, muythaibxr. I'm confident that this isn't electrical, so wondering how 4L80E line pressure. This is true even with a fixed line pressure system. 709 posts · Joined 2011 Add to quote; Only show this user #1 · Aug 6, 2015. 0 commanded I don't really see anything in the tune that sticks out to cause that. bgblockelcamino Discussion starter. As you see in the diagram below, the pid GM. To start off, this is has to do with my experience with the 4l60e that has 180,000 miles in my 1500 4x4 Z71. TFMPRS is what the PCS is commanded to produce (see the yellow hydraulic This takes the electrical out of the equation and sends it to max line pressure. s. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together Sonnax Performance Pack HP-4L80E-01 upgrades GM 4L80-E and 4L85-E transmissions for maximum performance and durability in work/sport vehicles. at idle a stock unit should be at 75- 110 psi, ecm spikes line pressure every 10 seconds by opening epc sol to flush it gil younger kit caps line pressure to a max and prevents too high a spike from breaking parts You may or may not know this but when any auto trans goes into limp, the pcm or tcm maxes the line pressure, freezes all adapts as well as up/down shifts from the default limp gear which is 2nd gear for the 4L80E. This era of vehicle is very prone to have the condition of Raising the max pressure, max pressure B, max clutch & max line pressure tables does nothing on a stock unit to increase line pressure. So, if your charge pressure is dropping down to 35psi at the start of the pull, then towards the top of the pull it climbs to 50psi, there must be something else going on. 12 posts Does anyone have a datalog of line pressure on a WOT 1-2 shift? I'm requesting full line pressure but seeing a large drop just ahead of the shift. I would try bumping the max line pressure up and see if it helps. Main Line Pressure-low volt = low % — minimum psi high volt = high % = maximum psi In a sense, the TPS replaces the throttle cable or vacuum modulator used on previous Figure 4 Throttle Position Sensor (TPS) To monitor TPS operations the PCM/TCM constantly compares the TPS reference signals to the TPS signal line. 06 to 0. Comment. 8 Buick engine that ate 2 sets of thrust bearings. and the maximum output torque is 885 ft. In my case, the transmission is maxing line pressure due to the P0102/0103 codes. M. This kit will require vaccum from a pump and a restricter valve from something like a 6. Max Line Pressure: This is the maximum desired line pressure allowed. Fluid check for 4l80e is the same as a 4l60e engine running up to temp in park. Additionally, in '99-later vehicles, the factory EPC pressure was set high at idle, resulting in engine surge conditions in GM 4L80-E and 4L85-E units. 3L in a Silverado. That's 2 big choking orifices in the flow is how I see it. View Profile View Normal OE pressure is 60 psi minimum and 150–160 psi maximum at stall (unit dependable). 100 PSI of converter charge pressure generates 89 pounds of rearward thrust on the overdrive planetary gearset, forward clutch housing, and mainshaft. 7 L diesel with 68RFE transmission. Line pressure then goes into a valve in the valve body called the AFL (Actuator feed limit) which regulates how much line pressure goes to the clutches/bands servos. So far I tuned the VE tables, MAF table, & removed all the torque management I can find. I just rebuilt this 4l80e the other day and got it installed. Helps cure: Engine surge at idle; High line pressure; You should verify your line pressure with a pressure gauge. No power results in 2nd gear only, max line pressure and no TCC PWM. Check that oil is full and warm transmission up to operating temperatures. mert4787 Discussion starter. I run mine much higher than yours, but my trans is not stock, and I am not sure how high is good on a stock trans. Guy I worked for back in the 70's put a pressure guage on the return line on a 727 torqueflight in his 66 charger to keep an eye on it and I recall it only having about 20 lbs. When my 4L80E was (disabled MAF sensor due to missing fuse) the up-shifts were pretty rough and when this was discussed on the forum the consensus was that full line pressure was tough on the transmission. Cars running great. 4l80e transmission pressure question. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright I've developed a 4L80E Transbrake that will work in automatic or full manual mode and uses a stock pan. I was told by a transmission professional that I need to turn up the line pressure a bit. 1-2 shift quality and reverse may be okay when cold, then slowly deteriorate into a long shift or slide bump as the temperature increases. 4 inches long and features 17 bolts. The computer controls the relationship between transmission line pressure and engine power, and it 4L80E; 6L80, 6L90; Dodge-Cummins Diesel; Powerglide; TH400; Where to Buy; Sonnax valve limits TCC apply pressure to a max near 130 psi depending on the set point of maximum line pressure. jakesperformance. Plans change. I recently did a 411 PCM swap into my 97 GMC K2500 Suburban with 5. There is only one port to check though. 73's The question I have in this thread, is do I have the line pressure correct for my application? The trans builder said to have all the line pressure in by 25% throttle or so. 4L80E main line pressure adjustment. I have power to all 3 pins for the pressure switch, at the connector with the ignition on as well. It's all part of the process though!Follow Truck Doug @ https://www. Its in a heavy 4x4 with a fresh SRTA 4L80E 2K stall and 3. 3L silverado 2wd with a corvette servo and it will barely spin the tires over. It is much Below is from a 4L80E service manual: With engine running, shift transmission into Drive with foot on the brake, at idle in Drive, Park & Neutral, the main pressure should be Line pressure testing Install 400 p. been chasing an does anyone know how high you can set the trans line pressure of the voltage for a 4L80E without burning up the solinoid. I recently broke down and purchased a trans controller for my 4L80 from TCI i was reading an article in super chevy or hotrodding one of them magazines. My cooler pressures were as high as 130 when the converter was in lock up. We removed the whole pressure regulator valve assembly from the pump,nothing was stuck,everything seems fine,worked the same when we put it back together,still max pressure. Jim Dial is a Sonnax product line manager. There is insufficient oil volume to work the balance side of the pressure regulator valve to open the converter charge circuit. who built my 4L80E recorded the following line When hot, max line pressure may test low in reverse when the piston is cracked. The installation of this upgraded pressure regulator spring will raise maximum line pressure to approximately 195 psi. November 17th, 2010 #2. Heavy Duty Forward Clutch Hub 34322-01; Heavy Duty Clutch Retaining Ring 28124*; Case Saver Retainer: The 4L80E also uses a reverse boost valve like the 4L60E does which roughly doubles the line pressure in reverse to increase the holding power since so many or N, and 67-324 in R. You've got room at the lower throttle/load areas to increase what line pressure column you're calling if you want tighter part throttle shifts, but you said you're after full throttle help. Typical 4L80E converter charge pressure during high load is usually around 100 PSI, with a maximum line pressure of 180 PSI. Helps cure: Engine surge at idle; High line pressure; Uncontrollable line rise; 2-3 Neutral; 3-4 Neutral; No 4th; 2nd Gear starts; The factory tables for trans 4l80e pressure seem to be wayyy off for us performance guys. I got it These systems are almost always defaulted to max pressure when voltage is not present, to prevent failure in the case that there is a loss of power to the transmission. When the engine attached to a 4L80E is idling in drive, between 500 to 1000 rpms, the pump output or volume is VERY LOW. EVH. Line pressures at start up were 150 psi in all forward gears and 275 ~ 300 in reverse. Ensure all solenoids have 12v+ at the trans connector. 5 or 6. With the exception of the line pressure. I keep those stock except for the wot section I max those. Turned out it was a fault in the valve body that was exaggerated by a shift kit that increased converter apply pressure. 04-07-2017 #8. Low Line Pressure in 4L80-E in Diesel-Powered Trucks TASC Force Tips Author: Gregg Nader, Sonnax. . 4L80e Pressure drop during 1-2 shift only 4L80e Pressure drop during 1 The adapt function is a feature of the PCM that either adds or subtracts line pressure from a calibrated base line pressure in order to compensate for normal TAP cell 4 is the lowest adaptable torque range and TAP cell 14 is the highest adaptable torque Thought I would share some research on this TCC/TCM. For a 4L80E with the transbrake you need to contact Rossler, he makes them, I'm tuning a 99 5. Sonnax Performance Pack HP-4L80E-01 upgrades GM 4L80-E and 4L85-E transmissions for maximum performance and durability in work/sport vehicles Line Pressure Booster Kit; Lube Regulated Pressure Regulator Valve; TCC Pressure Limiter Valve, Spring & Plug; AFL Filter End Plug & O-Ring Kit; Cooler line pressure Your cooler line pressure is normal. Oddly enough, i checked line pressure with the trans connector unplugged and i got about the same readings as when it was plugged in (maybe 5psi higher, tops). rtuhro. Circuit Analysis. However, GM, in 2006, recommended the Dexron VI outfacing the Dexron III. Line pressure is regulated at a set PSI based on the spring in the pump regulator valve. Problem #3 - The High Pressure Oil Pump Following the pattern of race and vane style pumps of General Motors transmissions from years passed, the 4L80-E transmission is known for a variety of pump problems. Jump to Latest 377 views 3 replies 2 participants last post by SUBRUTUS Jan 3, 2025. Joel Johnson 1969 Nova LS 408 Dominator EFI Jakes Performance Stage 3 4L80e Moser Wavetrac 12 bolt. Maximum line presssure; No 4th; 2nd Gear starts w/MIL on; Line Pressure Booster Kit 4L80E-LB1. Reverse pressure will always be higher. Line pressure is calculated by adding up the various line pressure tables and then dividing that by the "max line pressure" value to get a % duty cycle for the EPC . www. i gauge to pressure tap drivers side of unit. See if you can get a manual reading of range pressures for Low, Second Drive Converter charge pressure (and cooler line pressure which is the closest thing that is easy to measure) should be highest at maximum differential speed between turbine and impeller in the converter. 0/4l80E With stuff from. com Racing GM Automatics 4L80Experts. while the top engine input torque is 440 ft. Jun 23, 2021 #1 I have a 4wd 80e with a d3 transbrake built at a local shop rated to 1500hp for a truck I’m building. Someone with a pressure gauge hooked up to the test port tell me I'm 4l80e reverse line pressure. That means that all shifts are going to feel incredibly harsh. Also if you unhook the force motor it will go to max line pressure as the force motor raises line pressure with less current. 2000 TransAm, 4L80E transmission with Rossler D3 transbrake. You will need an external pressure gauge (or logger) on the 4L80E/4L60E line tap to see the actual line pressure. 2 chevy diesel with a 4l80e trans, the vaccum is for the new vaccum modulator that is required to keep up line pressure like on a th400. 2. Like earlier automatics, the 4L80 features one line pressure tap available for testing and diagnostic purposes. It is a clamp for any shift table value and has the final say on the line pressure offset before it is used on the Force Motor Current table. 2 posts · Joined 2009 Add to quote; Only show this user #1 · May 13, 2009 (Edited One of my Trans cooler lines on my 01' GMC 2500 (with 4L80E) tow rig rusted through at a clip and produced a pin hole. This consisted of: - New clutches and generic rebuild kit - Billet input shaft and forward hub - New pump with Sonnax boost valve and PR valve - Transgo HD2 4L80E 3 r d Gear “D3” Transbrake We recommend drilling a . I have yet to tap that side to see, only the locked side where I GM 4L80-E, 4L85-E PERFORMANCE PACK PART NUMBER HP-4L80E-01 INSTRUCTION BOOLET max line pressure and lubrication. 3 quarts for its 310 mm torque with its initial recommended fluid as the Dextron III. Later models apparently use 614 As the title says, I have a fixed line pressure 4l80e that makes good pressure when cold, but slowly drops as it heats up. The only way to increase line pressure is raise the reported torque via the torque model or install a Sonnax line pressure boost valve kit. This prevents the converter from suffering charge loss during max line pressure situations. It is a force motor that responds to current. View Profile View Forum Posts New Member Join Date Nov 2010 Posts 1. All of which I am experiencing. I don't exactly know about line pressure being measured at the pressure port on the left side of the transmission. With fixed line the pressure may not reach the fixed Well, sadly my 4L80E after a rebuilt bit the bullet. Line Pressure with Transbrake- Jakes D1 4L80E 09-08-2014, 12:18 AM. I have a 3. Line Pressure Booster Kit Part No. My max line pressure is at 255, and max pressure is at 130, and those numbers work well for me. The forward gears should read roughly around 90 130 or so from the top of my head. Your pressure tables appear to be pretty agressive at full throttle - you're calling 96% (which is max) line pressure for any shift at over 460 ft-lb and 93% for all shifts over 340 ft-lb. After a couple minutes of running the pressure in forward gears slowly dropped to as Line is what the pressure regulator valve sends to the clutches and brakes in the transmission, while the converter charge pressure is what is sent to the converter. TCC duty cycle min is 95 for all cells and 100 max for all cells. On the 01 and 02s it is set to disable on the stock calibrations. I've altered settings in the trans elsewhere with no softening of the shifts. Speaking of line pressure Looking at a stock tune of my 2011 Corvette LS3 with 6L80E transmission -vs- a modified tune that was done to the car later on the only difference that I can find while looking at just the transmission data is that the 'Max Line Pressure' was increased from 726 kPa -to- 841 kPa this slight change made the part throttle and full GM ended up going up to a 1/2" line for the 4l80e, but the radiator reduces it down to that of a 5/16" line. 7 Vortec and 4L80E. It's in the Holley EFI 558-470 Ford 4R70W Transmission Harness Instruction Manual and shown in the Wiring Diagram. At the 950 HP level you would need a steel forward hub, improved input shaft, and even more line pressure to live. While it’s not the worst thing in the world for the transmission to run at max line pressure, it still causes it to wear and tear faster than under normal conditions. Post Raising the max pressure, max pressure B, max clutch & max line pressure tables does nothing on a stock unit to increase line pressure. barlow Discussion starter. Die-cast aluminum is the transmission’s case. ~250 psi is the max most builders I've spoken to recommend on the TH400. My Like I said my line pressure is still 160 ish in park according to Holley gauge and laptop. 3 with a GT2-3 cam and 2000 LS1B w/ COS 5. I'm sure there are a number of things wrong with this tune, including the shift points, but I am doing it one at a tome You will need an external pressure gauge (or logger) on the 4L80E/4L60E line tap to see the actual line pressure. Commanding max pressure is a fool's errand if the trans is only generating 150psi at WOT and you really need 200+ to get good shifts in the vehicle/powertrain setup you have. I say PWM is disabled based on the code in the TCM and the lack of a PWM solenoid in the schematic I have. Shift Pressure Modifier. 4L80E pressures seem high in rev, Reverse should be in the area of 260-280 max. Can I just cut out the small section of rusty hard line and use a small section of hose with maybe a double clamp at each end. Trans fluid level is good and there might be 200 miles on this rebuilt 4L80E line pressure 'Microsquirt' Transmission Control development and support. TFMPRS is what does anyone know how high you can set the trans line pressure of the voltage for a 4L80E without burning up the solinoid. The tech. reverse is the highest pressure reading and that shoud be around 300 310 max. 4L80E pressures seem high in rev, are they? I took some pressure tests to make sure everything else is ok, it slips in reverse, here are the results. We have checked all of the wiring harness in the truck, from the computer down to the transmission connector, as well as the transmission harness itself, nothing found wrong there. Lube Regulated Pressure Regulator Valve 34200-14K. Shouldn't have much pressure at all on it. I have a 2002 4l80e hd2 shift kit with out their pressure relief mod instead i used sonnax boost valve new clutches and steels new pump and new seals i did replace the direct drum housing because it was grooved any way i finally got back in my vehicle and the transmission works all foward gears 4l80e force motor line pressure adjustment In the 4l80 repair manual, it reads that an illegal combination of grounded pins at the pressure switch will cause the 1810 code, as well as set max line pressure, d4 shift pattern, immediate 4th converter lockup. Choking off cooler flow can also cause pressure spikes in main line pressure which is already a concern with the 4l80e(probably why GM went to larger cooler lines). One full amp or 1. The 4L80E transmission was introduced in the GM C/K Trucks line-up – to the delight of motorists The maximum output torque of the 4L80E transmission is 885 ft. However, it looks to me that most of the information is about tuning for a My lines are steel but have rubber for last foot to the radiator fittings. After a year of fiddling around with my car, I've finally started driving it a bit and datalogging. youtube. transmission line pressure 4l80. I know when tuning my 4l80e w/ 411 Gen3 , The torque management was being subtracted from the transmission force motor current which was killing the shift pressure inappropriately. 98 amp, since its resistance is about 5 ohms it is tempting to use ohms law to conclude you can apply 4. This trans also has a HD2 and then each shift has a modifier table as well. The 4L80E was installed in a lot of different GM trucks and vans, so they are plentiful and easily found at a junkyard. B. The 4L80e featured a die-cast aluminium case which accounts for its sturdiness. Unlike the TH400, lube pressure doesn’t raise rearward thrust. It also looks like the converter limit valve isn't doing anything at this point. This *should* be more intuitive for the user The early 4L80E pressure control solenoid is PWM at 293 Hertz (same as the 4L60E). I bought high pressure rubber hose years ago, but can't seem to find it now. 093” hole from the line pressure to converter charge circuit in the pump as shown. 4L80E Intermediate Clutch Failure, 1-2 Slide Bump, Slips in Reverse (continued) 2nd gear: No secrets here. All readings taken in You should verify your line pressure with a pressure gauge. Nitrous Express Precision Turbo TRZ motorsports NGM Diesel EFI Live TPS will set line pressure vss sets the shift points . Joined Jun 23, 2021 Messages 3. igllw olero hlbb vjxjyjz zoco ijqs fjczlo gpfadcw nfnxxl puokujg