Mark the shaft with a piece of chalk or something, front, rear, and rotation it's a good idea to try to get it back in the way it was. After you have the shaft out of the truck, you have to heat the yokes with a torch. The original joints have plastic injected into them to hold the cups in place you have to melt that out to get the joints apart. The new joints will come with snap rings to hold them in place. Once you have the plastic melted out support the shaft as close to the end as possible (be careful not to dent the shaft). Take a fairly good size chissle and hammer and pound on cross part of the old joint to force the cup out on opposite side. Repeat on all the cups, once you have the cups out clean all the rust and scale from the shaft bores. When you go to install the joints be sure you have the cross turned in such a way that you access the grease fitting (if that applies). What I do, is insert the cross into either the shaft or the yoke and carefully put on one new cap. Now, with a u-joint tool, vise, or big C-clamp push that cup in past where it would normally stop (1/4 inch past). By doing that you can get opposite cup started on the cross without messing up the neddle bearings. Now install the snap ring on the 1st cup and push the 2nd. cup into place and install the snap ring. Repeat on the rest.
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