Hi Mick,
Thank you for the donation.
Overfilling of trans fluid can cause the symptoms described. Recheck the trans fluid level again if you did not follow the following procedures.
Hydra-Matic 4L80-E & ZF 4HP 24E
1. Park vehicle on level ground. Apply parking brake, and run engine at 750 RPM for several minutes. Shift gear selector through all ranges and return to Park.
2. With engine idling, withdraw and wipe dipstick. Replace dipstick in filler tube, withdraw again and check fluid level. Fluid level should be between MAX and MIN marks on dipstick. Add fluid if necessary. DO NOT overfill.
NOTE: Transmission fluid temperature MUST NOT exceed 122 °F (50 °C) when checking fluid level on ZF 5HP 24 transmission.
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Sunday, February 22nd, 2009 AT 8:04 AM