Re: GMC tranny problem

Posted by Allan in NE on September 27, 2004 at 20:03:07 from (148.78.243.25):

In Reply to: Re: GMC tranny problem posted by Charles on September 27, 2004 at 17:35:08:

Hi Charles,

Yes, we retrofitted all the 4L60 & 4L80 dipsticks to the locking type. This was going on at the same time as the vent tube modification referred to in Tommy's post below.

Trouble was, these two modifications did nothing to get to the core problem of overheating. It just covered GM's backside somewhat against lawsuits resulting from the hot oil fires.

In the 1991 model year, GM finally somewhat bullet-proofed that tranny against failure by redesigning & spring-loading the 2/4 clutch release.

Towing still gave the transmission fits, but if the owner installed the optional GM external cooler and stayed out of overdrive, chances of the transmission's survival increased quite a bit.

Allan

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