4l80e Line Pressure Adjustment. Enter your name and Dealership on the cover so that it may be forward

Enter your name and Dealership on the cover so that it may be forwarded to you in the event it is mislaid or lost. The pressure should rise with throttle. Remove check balls and PWM solenoid screen from case. Mar 17, 2025 · The OE pressure regulator valve design prevents adequate cooler flow at low RPM and high pressure/demand conditions, which can create overheat complaints. Put it into my street rod which already had a 4L80 and a first gen GM 4L80E technical information The 4L80E transmission is a four speed automatic with torque converter clutch. 99K subscribers Subscribe Is there a way to only control transmission line pressure on a 4l80e? I can wire the trans to manually but it'll have full line pressure. As you see in the diagram below, the pid GM. Solve 4L80E transmission troubleshooting issues fast. 2K views 01:53 Test unit #1 3rd gear clutches showing heat from a shift flar Apr 26, 2024 · 14K views 02:46 Old school 400 transbrake and the issues with them. Select the appropriate pressure regulator spring based on the intended application and install it into the oil pump. If you have any questions about the installation or line pressure readings, please contact our technical support department. Aug 16, 2023 · Starting a 4L80E information thread for those that want to learn more about these transmissions, how to service them, overhaul them or considering it for a swap into a GMT400 series truck, Squarebody or anything for that matter. ft. Be aware this isn't the "correct" way to adjust line pressure. Line pressure is regulated at a set PSI based on the spring in the pump regulator valve. LOWERING this table will RAISE the pressure returned by all requests. Gear" what are safe pressure limits for a stock 4L80E at the various torque settings? I've got 1->2 and 2->3 scaled from 0 @ 40lb-ft to 84 @ 640lb-ft and those shifts are really nice for my stock truck. That is located just above the shift lever on the transmission. If you have a large drop in pressure from cold to hot, you most likely have a damaged or worn pump. For a year and a half, the pressure would be around 35-40 psi at idle and driving My newly built 4L80e transmission is in! It doesn't work. Mar 1, 2002 · The computer controls the relationship between transmission line pressure and engine power, and it knows exactly what the amperage of the transmission pressure-control solenoid (PCS) should be at any given throttle position and engine speed. Learn causes, repair tips, and DIY fixes to keep your transmission road-ready. You know that your physical line is low in forward gears. I can look up specs sat and post if needed. Ok and with that said, the force motor current table is the final lookup for the current needed to generate the specified pressures via the PCS. I think that there is a chart somewhere indicating amperage to the force motor vs line pressure. 4K+ STREET/STRIP MILES ON TRANS. My line pressure is: 120 idle 205 reverse 1-4 gears cruizing 90-120 typically when downshifting to 2nd and doing wide Line pressure and shift feel are also controlled electronically with a Pressure Control Solenoid (PCS) located on the valve body. Oct 5, 2014 · Picked up a "junkyard" 4L80 for my son's '67 Chevelle. The pressure chart shown is used for all Astro and Safari vans that use the 4L60E. I'm confident that this isn't electrical, so wondering how it compares to others. Jun 22, 2023 · Recommended Sonnax parts for 4L80-E series rebuilds make it easy to upgrade heavy-duty and high performance vehicles at any power level for max reliability. Remove spacer plates and gasket. Pressure gauge is hooked to the line pressure port of the trans. LOW LINE PSI IN REVERSE. Reverse pressure will always be higher. I was struggling with my 4l80 shifting real hard from 1-2 and I finally Sep 13, 2022 · 4L80E line pressure by jsmcortina » Tue Sep 13, 2022 12:09 pm 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. 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. 63 . This is not electronically controlled. Reverse is about 105psi. It is not recommended to change these values unless you have modified the transmission pressure control solenoid or are experiencing trans slip under heavy load. 093, OE Boost Valve (new) 24202644, OE Boost Sleeve (new) 24202645, OE pressure regulator valve (new) 8680547, OE washer (used), OE isolator spring (used), OE pressure regulator spring (used), Sonnax 34200-05K o-ringed end plug. Apr 19, 2008 · Can the line pressure of the Allison be adjusted by EFI Live? I want to get just a bit more pressure into 5th. Remove parking pawl and manual linkage. 7 . In the upshift table "Base Shift Pressure vs. Its in a heavy 4x4 with a fresh SRTA 4L80E 2K stall and 3.

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