Good evening,
This sounds like the clutches are slipping inside the transmission.
https://www.2carpros.com/articles/automatic-transmission-problems
Are there any codes set?
Roy
TECHNICAL
Bulletin No.: 08-07-30-009C
Date: February 04, 2013
Subject: (R)HYDRA-MATIC Front Wheel Drive 4T80-E (MH1) Left Front Axle Seal Leak, Transmission Slips in Gear (Replace Third Clutch Housing with Revised Service Part)
Models:
2001-2008 GM Passenger Cars
Equipped with HYDRA-MATIC(R) Front Wheel Drive 4T80-E Automatic Transmission (RPO MH1)
Supercede:
This bulletin is being revised to update the Warranty Information. Please discard Corporate Bulletin Number 08-07-30-009B (Section 07 - Transmission/Transaxle).
Condition
Some customers may comment on a transmission oil leak and/or that the transmission slips in gear.
Cause
An oil leak may be caused by bushing wear in the third clutch housing, causing excessive fluid build-up at axle seal.
Correction
Important
DO NOT replace the transmission for above concerns.
Replace the third clutch housing with service P/N 8682114, which has revised bushing material to extend life and reduce left front axle seal leaks. Refer to Automatic/Transaxle-4T80-E Transmission Off-Vehicle Repair Instructions in SI for the replacement of the third clutch housing.
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