You might ought to check in buying a used transmission from Ed Morad and having it installed or installing it yourself. We got one for our 98GTP and it was like 650.00 shipped I think. The car isn't worth what a rebuilt was going to cost and a shop price was high also.
The transmission only had 92 or 98,000 when we got it used from Morad. The shifting seemed to still not shift quite right after installing but I think it has more to do with the car and motor having so many miles on it. Car is still going strong though. It does fine but it just seems like when pulling up a hill say, the car builds boost rather than shifting down. A quick mass of the throttle will get it to kick down and go. That is why I say it is more to do with the car since the old transmission did this also before going out.
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charlie
black 98 gtp sedan, 222,000 and running great with the new used tranny!
zzp 3" d/p aluminized
dhp 1.0