Long story...sorry. We actually did get a reg 350 convertor in his truck, and it was driving OK. When we went to the track one day, about halfway into a run the engine spooled up to the rev limiter and then shut down. We got it back to the pits and the truck wouldn't move in any gear. All we got was a "whine" that increased in pitch with RPM. We took the trans out, cut the convertor in half, and found out we only had about 1/4" spline engagement between the convertor and the input shaft, and the splines broke in thast area. Thats why it wouldn't drive in any gear.
So, we were wondering if we cut that "nub" off the end of the input shaft, would we get enough spline engagement for the reg T350 convertor to work properly? Like I said, all the lockup internals were not reinstalled in the trans when it was rebuilt.
This whole process is to save $7-800 buying a lockup hi-stall (3000rpm) convertor since we already have a reg T350 3000rpm stall convertor. Thanks for the reply.