4L80-E slips in R. high line pressures - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-27-2012, 11:23 AM
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4L80-E slips in R. high line pressures

with harness connector connected pressures are Reverse 270 psi. Drive 130 psi. P-N 65 psi. With harness disconnected pressures are Reverse 280 psi. Park, Neutral, and Drive are 170 psi. Trans. goes into Reverse but slips. Forward gears are OK. fluid isnot burned and no codes. Am at a loss. Help.
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Old 02-27-2012, 07:25 PM
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Quote:
Originally Posted by mastermechanic99
with harness connector connected pressures are Reverse 270 psi. Drive 130 psi. P-N 65 psi. With harness disconnected pressures are Reverse 280 psi. Park, Neutral, and Drive are 170 psi. Trans. goes into Reverse but slips. Forward gears are OK. fluid isnot burned and no codes. Am at a loss. Help.

Is the ''check engine'' lite on?

Have you checked for trouble codes?

What year 4L80e trans?

Recent repair work or is the trans high mileage?

Common failure on the 4L80e is a cracked rear band servo. This causes reverse to slip.

If the PCM is seeing a slippage in reverse, the system will raise main line pressure to compensate
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