Is it possible to take a 1971 open drive shaft SM420 and modify the u-joint and u-joint housing section to mate up to my 1954 torque tube drive shaft/differential? I currently have a 3 speed and am tired of it sticking in 1st gear. I'm hoping that only the housing for the sm420 u-joint and possibly the u-joint itself would need to be replaced. Any thoughts? Image 1 is my current 3 speed. Image 2 is from Denny's SM420 rebuild with an enclosed driveshaft. Image 3 is the 1971 SM420 in question. Any help would be appreciated! mark
