Quote:
Originally Posted by travislambert
I hear statements like this a lot which is the reason for the question. The engineers at GM are pretty sharp. I'm thinking they are aware of the cold shift problem, but there's a reason for sticking with the fluid they're using. It could just be a supplier contract, but I suspect it's more than that.
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My best friend at General Motors Prooving Grounds in Milford, MI and works in the calibration / R&D department.
When I asked him about the clunky shifting, he said "Just switch it to Syncromax or Redline, thats what everyone here does that owns a Tremec trans".
GM doesn't even make the transmission and they didn't design it. They fill it as absolutely as cheaply as they can with the same fluid they put in any other manual transmission.
There are MANY people on this forum who have done the same thing and it fixed their issues.
Tremec uses composite syncros which means you have to use an ATF without any detergents in it (the detergent will make the syncros swell), which means most of your Dex4 ATFs CANNOT be used. That is why GM recommends DEX3, which is non-synthetic. Not because it is their best option, but because it won't ruin the syncros.
The SyncroMax is a full blown synthetic lube with no detergent.