Originally Posted by JLBpontiac350
...i would like to keep it as stock as i can. its a th200 metric tranny with a stock 305.
Look on the driver side near the shift shaft for an electrical connector. If there's one there (and there should be if the trans is original and/or correct), it's a "C".
A "C" needs the computer (or to be wired to lock up w/o the computer) in order to work as it should. If you've done away w/the computer, it's not very original- so I'd use the TH350. IMO, even if it has everything
original, swapping out the TH200C for a TH350C (also w/lock up TC) would be an improvement and I cannot imagine it causing the vehicle to lose value. On the contrary, it should increase the value. If you're worried about it, save the original to sell w/the car.