Mitsubishi Repair: transmission breakage, spacewagon, neutral position

Question
hi,i am driving a mitsubishi spacewagaon (2002) model. the transmission broke for some reason inside,i've change the transmission completely from a good running car, same model,the problem is when the transmission was installed the car would run for a few distance and suddenly stop.the gear shifted in a neutral position for reason i dont know.is this could be a computer sensor problem to the transmission?do you think electrical system has something to do with it?pls help me . i have search the net looking for a repair manual to this car that i can buy,do you also know a place / site that i can check? in cd or book manual . pls help me ,.... thank you very much, hoping to find a solution to my problem.

Answer
Agnes: Sorry on the repair manual for some reason the spacewagon just does not have a repair manual for it that you can buy. I would say you need to have the car coded, to see what the computer might tell you is going on with the system. It does control the transmission, so there could be a sensor weak or bad. But coding it would help explain a lot of things. Hope this helps and God bless: Linda