Jesda wrote:service records show that the original transmission had to be replaced at under 40k for the beefier (more reliable) one.
I'm not sure that there were that many improvments to the transmissions over time... I know Infiniti tried an external filter at one point - and Q1's current reman has vent holes in the bell housing around the torque convertor - but they say it just depends on what parts they had on hand when that particular unit was remanned. (e.g. one transmission had a drain plug on the pan, but this one doesn't).
I guess it's a crap shoot with anything. My 90 had 95K on the OEM unit and we replaced it under warranty for "slipping" because of my concerns over the typical whine that I hear from every Q transmission when it's below 60F ambient temperatures. It wasn't really slipping, and shifted as well as the remans they put in later.
I didn't believe the service guys when they said it was normal - but I've never had a Q transmission (or heard one) that's quiet when it's cold outside... In any case I don't know that it had much maintenence - maybe one pan drop at it's 60K service at T3 before I bought it. I wouldn't assume that every production transmission on the early Qs was junk...
I sure hope not since "Q2's" transmission is the original!! It shifts perfectly, so hopefully with her 93 TCU, a cooler, and the new pan I ordered with a drain plug (for partial fluid changes at each oil change between flushes) and Mobil 1 ATF it will last for a long time...
Heath