Justice,
Just a note that the pictured yoke is actually the rear half of the torque tube universal joint assembly, which slides onto the drive shaft stub in your torque tube. The front yoke is the part that slides onto the transmission output shaft and should be secured with a large washer and bolt to that shaft (not shown in your pic).
After a bit of resource searching, I did find that there are some minor differences between the 3 spd and 4 spd torque tube u-joint yoke assemblies which you can see in the picture I found in our own member
tclederman's web pages
3 Speed and 4 Speed u-joints. It provides a better comparison than what can be found in the parts books.
The picture doesn't give measurements, but clearly shows that the front yoke half of the u-joint assembly is longer for the 3 Speed vs the 4 Speed torque tube units.
A search of the
1929-54 Chevy Master Parts catalog shows that both rear halves of this u-joint assembly use the same rear yoke - GM# 3665768. So no difference at least in the length of the rear yoke section.
That resource also lists a different rear yoke for the 3/4 Ton enclosed front u-joint assembly as GM# 596911, but I couldn't find anywhere what the length of that yoke is to compare to the 1/2 Ton parts.
I guess the next question is, why do you need a longer yoke???
Dan
