Sounds to me like maybe the selector wasn't hooked up correctly? I rebuild a 904 with a T3 shift kit for the very first time last summer and it worked perfectly. $104 for the rebuild kit and $92 for the T 3 shift kit. Anything over that was Labor they better get that straight. the first timer like me can rebuild one of those and make a real gear banging dragstrip transmission out of it at the very least they can make yours work right or whatever you paid over $200 in parts.