When I installed the open drive shaft and new spring perches on the '47 I left them long. I was told to drive it a while, re-torque them and use a cutoff wheel to trim them up with a 1/4" of threads exposed below the nuts.
Attachments
U-bolt Diagram.JPG (22.98 KB, 41 downloads)

Last edited by HandyAndy; 09/10/2022 2:40 PM. Reason: U-bolt Diagram added.

Andy

His: 1947 Chevrolet 3104
Hers: 2008 American Saddlebred

"I proudly Stand for the Flag and Kneel for the Cross" Unknown