With the flywheel removed I checked both parallelism and clutch housing Pilot bore runout, with a dial indicator per the manual, and both are well within limits.

The flywheel face had .001”run out. Oddly, the face of it is not flat- it is cone-shaped……..the inner segment of the flywheel surface is “higher” than the outer segment. It is significant- laying a machinists square on the section where the clutch disc sits reveals that the flywheel surface “cones” upwards towards the center of the flywheel. I’m bringing it back to the machinist tomorrow. Cone shaped flywheel surface

The driveshaft slip yoke is 3.75” long from the back of the casting’ machined face to the end of the yoke. Slip yoke

There is 1.5” of that yoke section exposed when the driveshaft is installed, which leaves 2.25” of slip yoke that sits inside the T5’s tail shaft. This doesn’t seem enough to me. Your thoughts?

Last edited by Norcal Dave; 05/03/2023 2:47 AM.
~ Dave
1950 Chevrolet 3600 3/4-ton with 261 engine & T5 Transmission