Originally Posted by skza
I wonder what physical differences there are between the 4t65e and the 4t65e-hd...
what makes it "heavy duty"???
The differential pin diameter is larger for one. I think that it is mainly just larger internals, and the HD version got the larger torque converter. And it got a higher final gear, 2.89 compared to the 3.29.
What I was actually looking for is the RPO number (trunk lid number) for the 4T60-E HD, mainly to figure out which one that I have, the POS normal one, or the POS HD one
. I have a 94 Grand Prix GTP with the 3.4 DOHC engine, and it just tears up transmissions. If in fact I have the normal 4T60-E, then when my transmission blows I will drop a HD one in. The only problem is that I have no idea which one I have, its RPO M13, i know that.