my sisters teg tranny is starting to slip at the 1st to 2nd transition, i found a local that is selling a tranny for $40 but he doesnt know what year its off of. my sister has a 93 teg. is there a way to tell from the vin number what year the tranny was made? and what year trannys can i use on my sister's car without running into any compatibility problems? i.e. computer...etc