96 Q45 with 91-93 transmission

[Twin96Q45]

Hi,My 96 Q45 transmission went out at around 188k. Was running strong but the clutches worn out first on the reverse and then 1st gear. I made a big mistake by replace it with a used 91-93 one. Now it always go the limp mode after a few minutes. Is it the TCU or something else? I had switched the TCU with my other 96 Q45 but it 's the same problem. Do I need a 91-93 TCU? Does it fit with the 96 wiring harness?Thanks

[93 Q45]

i just went through this with my 93 and no they dont interchange91 92 same 93 its own little bast---d 94 to 97 same so it sound like you messed up call a local salvage yard they will have more specific info all i know is my trans was a real bear to find i could find atrans for 94 plus all day

[rsiwicki]

You 2 guys are certainly the first to say that a you can't interchange years of transmission's with the year of the car. Your transmission is either installed incorrectly or the replacement is broke also. Do a search and read the posts, there are about 10 of us now that have several thousand miles and many years with the 90-93 transmission into a 94-96 Q. The gearing is different so you will need a 90-93 TCU to match up the shift points if you want it to be exact otherwise it will shift a few hundred rpms different. I have put over 30,000 hard miles on mine without a problem when I installed a 92 transmission into my 95 Q and I used both the 95 and a 93 TCU.