Quote:

The tail shafts are slightly different. The hemi box uses a bigger rear bearing on the tailshaft. I am pretty sure you can just use the smaller bearing and the 23 splined tail shaft and shaft and be ok. I think I have done that before. It has been a while since I have been into one of those and I don't really do that many of them.



The 18 spline box uses the 308 (large bearing) instead of the smaller 307 bearing. The snap ring also retains on the bearing with the 18 spline tail instead of on the extension housing.

You can use either extension housing as long as you use the appropriate bearing. The output shafts are the same.

I redid my 23 spline box with 18 spline guts and used the 23 spline output shaft, extension housing and bearing.