Finally underway with conversion from TH350 to Saginaw 4 speed (3.11 first). Car is a '67 Convertible with a rebuilt '68 Bonneville 400 transplanted 5,000 miles ago. Doing this on the ground, wheel cribs, with my 25 yo son as father/son project. Pulled the TH 350 and driveshaft with yoke. Yoke is 4.25 inches, 27 spline, slides all the way into TH350, 1" exposed when attached at differential and slides easily. New steel flywheel, disc, clutch, pilot bearing, throwout bearing, date correct BOP bell housing ... all went on easily. Tranny on floor jack finally slid in after removing distributor cap and tipping engine back a bit. Bolted on 2-groove 27 spline Saginaw 4-speed, shifter hole a bit off, but everything fit perfectly including cross member support. Problem : Yoke won't slide onto output shaft of Saginaw. Goes on about 1.5" then binds. 3" of Yoke shaft exposed, and driveshaft about 3" too long. Saginaw was rebuilt by 76 yo GM transmission tech from the 60-80's time. He does nothing now but rebuilds Muncies,BW, Saginaw, all linkages, and all period correct Hurst shifters. The tranny came completely set up and linkage adjusted. All that argues against having twisted output splines if he is knowledgeable. New seals. Many new internal components. The yokes must not be compatible ? Am I hitting the tailshaft bushing ? Where do I go from here and what Yoke do I ask for ? Tell me I don't have to pull tranny ..... Thanks !
