Thanks all, -I'm gonna have to measure the shaft length and yoke I have and compare it to the info I got. Still trying to verify the exact length for a 68 - TH400 car as the info collected so far indicate 48 to 49 1/2, or even close to 50"". Also trying to exclude that the mechanic back in the 80"s did not just leave the 350 trans driveshaft in place and just added the proper yoke to fit onto the TH400. I believe there is a dimension for the yoke sticking out and total length from end on the yoke to C/L u-joint on the other end.