What universal joints - please help!
 

Hi

I am trying to replace u-joints for my Blazer rear drive shaft and after removing it from car I have no idead what to buy. That what I can see dismounted looks so strange and nobody here knows what to do.
My car is Blazer 4x4 aut. transmission, 4 doors, LS, year 2000, 4.3V6
My drive shaft is Three Rivers 15038490

From catalogue it looks very simple 2 identical u-joints, but after removing, the u-joint from diff end looks strange: two caps looks pretty different than the oders two. Also dimensions are different. Two seeger rings are much nearer then sloths on the two other caps. See attached photos.

Before removal it was similiar to what we have here https://evrorazbor.ru/assets/images/...5/dsc00837.jpg

OK I know what to do. You can remove the thread then.