Originally Posted by md21722

The usual problem is the centering yolk. When I rebuilt mine all the needle bearings fell out of the yolk. The u-joints were lacking grease in a couple of cross ends but the caps still moved easily and the needle bearings had enough grease that they didn't fall out. Here are the parts I used a week or two ago:

3 x Spicer 5-1310X non-greaseable u-joints
1 x Spicer 211544X non-greaseable centering flange
1 x Spicer 286418 seal for non-greaseable centering flange

Note that the seal comes in a box of 5 so getting just one may be a little difficult.

You can go a couple of different ways on this. You can also rebuild with greaseable parts. I like the non-greaseable ones because they last a long time and greasing up there can be a pain. You can also replace just the ball in the centering flange if you switch to non-Spicer parts, like Precision. The entire Spicer flange is about the same cost as just the ball so I replaced it entirely.

Another note, I find the easiest way to do this is to hammer out the old u-joints with a hammer and socket. To reassemble, I used the frame of a ball joint press. Using the ball joint press there is no jarring force of the hammer so all the needle bearings stay put. With the parts clean, they will go in without much force. No need to hold the ball joint press in a vice, etc.