Replacing U-joint(s)?

I checked the "How-to" board and couldn't find this one listed.

I'm considering replacing my U-joint(s). The parentheses are present because my Haynes manual says the front U-joint can't/shouldn't be replaced, any comment? Also, when replacing the rear U-joint, which type/grade of grease should be used? Estimates on time involved for a DIYer?

you have to push the one side of the joint down so the other side cap can come off. once you get the joints out you just replace the same way they came out. The important part on the way back in is to be sure the caps are greased so that the pins don't fall over when you push the cap back on.