Originally Posted By: threeputtpar
Originally Posted By: paulo57509
Originally Posted By: demarpaint
I'd like to know the mileage on the vehicle, conditions it was used under, and how it was maintained.
Vehicle: 2003 GMC Safari
Mileage: ~131k
Usage: Not severe; no towing
Previous trans service: Pan drop, fluid and filter (every other pan drop); approximately every 30k-40k miles.
Fluid: Pennzoil licensed DexIII up until last fluid and filter change. Last fill was with unlicensed ST Dex III.
Failure Mode: 2-3 shift became "slippery". Eventually lost 3rd gear. Trans still has 1st, 2nd and reverse. Pretty certain 3-4 clutch pack failure (VERY common failure with 700R4/4L60/4L60E transmissions).
Cause of failure: Unknown at this time.
Data point: Failure occurred 7,312 miles after last service.
Rebuild in progress with upgrades - quality parts. No corner cutting here. New solenoids, wiring harness, aux cooler, rebuilt converter, etc.
https://www.700r4l60e.com/store/product.php?productid=320&cat=22&page=1
C'mon and admit it; you took Oil Changer's advice and have been using MaxLife in that trans.
According to him this is never an issue with these trans.
I have never had a trans let go during any hard use. They always seam to let go on flat roads while mildly accelerating.