Need help ASAP Ujoint replacement problem!!!

Replacing ujoin on rear driveshaft. I have a press. Can not get cap off of ujoint in order to remove it completely.

Suggestions!

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Press the joint and cap out of one side of the driveshaft then put the cap that is protruding in a vise and wiggle it off. No vise, use a pair of vice grips and a soft hammer to beat the grips and cap off. If that fails put a tiny bit of heat to the driveshaft where it grips the cap then pull it off. Hope this helps......