What to do if your 4L60E transmission slips?
If you want the TC clutch to grab a little better, put in a bottle of BLACK LubeGard (yes, BLACK… not red) and leave the PWM functioning, IMO. Just my thoughts. Click to expand… Do you have a reputable transmission shop in your area?
When did the GM 4L60 E transmission come out?
The 4L60-E is the “E”lectronically shift controlled version of the 4L60. The Late 4L60-E was released in 1997 in and fully phased into wide use through GM by 1998 in both RWD car platforms (including the C6 Corvette) and trucks in both 2wd and 4wd configurations.
When does slippage go away on GM 4L60E?
There has been no trouble code recorded yet for slippage, and even though I can see it on my tach and hear it in the drone of the engine (lovely straight 6 exhaust note), my AutoTap ODBII which has the “enhanced GM diags”, never shows a slip value above 1 or 2 RPM. The problem goes away at around 65 MPH and above.
What can I do about my GM Reman transmission slipping?
GM’s reman transmissions address the PWM valve bore wear by reaming the bore and installing a larger valve. Sonnax has a much better solution. They have you ream the bore and install a steel sleeve along with a new hard-anodized valve.
If you want the TC clutch to grab a little better, put in a bottle of BLACK LubeGard (yes, BLACK… not red) and leave the PWM functioning, IMO. Just my thoughts. Click to expand… Do you have a reputable transmission shop in your area?
The 4L60-E is the “E”lectronically shift controlled version of the 4L60. The Late 4L60-E was released in 1997 in and fully phased into wide use through GM by 1998 in both RWD car platforms (including the C6 Corvette) and trucks in both 2wd and 4wd configurations.
GM’s reman transmissions address the PWM valve bore wear by reaming the bore and installing a larger valve. Sonnax has a much better solution. They have you ream the bore and install a steel sleeve along with a new hard-anodized valve.
There has been no trouble code recorded yet for slippage, and even though I can see it on my tach and hear it in the drone of the engine (lovely straight 6 exhaust note), my AutoTap ODBII which has the “enhanced GM diags”, never shows a slip value above 1 or 2 RPM. The problem goes away at around 65 MPH and above.