Unfortunately bolt rear of shaft from axle and pull the slip yoke out, I think it's either a 7/16 or 3/8 wrench you need to take it it out (I've unfortunately done a ton of OBS u joints, just a warning to clear my name of any responsibility but I doubt you need it
*********CHOCK THE REAR WHEELS OR SET PARKING BRAKE, I'm not responsible if your truck runs you over**********
Make sure it's greaseable, I personally like Precision and Moog U joints, but yes those are the bolts and the front just slides out but have a drain pan under the the output on the trans, some fluid will probably come out.
Well I went to get them and o rileys and autozone couldn't tell me which ones I needed for front and rear.... So any help? O rileys had one that said it would fit the front and the rear but why would they have different ones as well?