manual trans question

Okay, so we got the tranny out today. The input shaft is indeed longer and thicker on the V6 t-5. We haven't gotten the V6 tranny torn down yet, but we did find out the main bearing is toast. The rollers became welded to the races. Not good. It looked like the main input gear had some wear too. We did notice that the '89 tranny has an extra electrical connection on the top cover. Any clue what it is? Do you think it's a good idea to rebuild the '95 tranny or just find another working one. The bone yard by us sells running take-outs for about $300.