Under drive removal

[Bob C]

I think you have to pull the rear axle then remove the u-joint from the back of the dual high so you can pull it forward and out of the cross member.

Bob

[Joe K]

Originally Posted by Bob C

I think you have to pull the rear axle then remove the u-joint from the back of the dual high so you can pull it forward and out of the cross member.

Bob

Yes on that. The problem is the diamond shaped cross member "receiver" (which serves as foundation for the rear axle "push" and also to prevent the dual high unit from "rotating") is applied to the rear of the center back cross-member. AND the dual high is the first thing into the truck chassis - and it has to be the last thing out.

Original diamond receivers are riveted to the "rear" surface of the cross member. Sometimes in repair expediency, they were relocated using bolts on the front of the cross-member - which allow undoing the bolts and withdrawing the diamond receiver/dual high as a unit. (There is enough play in the spline/rear axle positioning on the spring clevis to allow this.)

But Ford changed the entire area in the 1930 Model Year and Borg-Warner transmissions/high speed rear ends - and again with retrofit replacement intermediate shafts. See discussion connected with this at https://www.fordbarn.com/forum/showthread.php?t=160035


The above pix shows the replacement intermediate shaft and the early version diamond receiver (and the splines it contains.)

Joe K