However while your in there I would just replace the shafts with 1 pice shafts.
You eliminate the problematic Vacuum Disconnect, and get larger 297X Ujoints which are ALOT stronger.
The shafts are essentially drop in, You need to remove the fork off the Vacuum actuator. And install a Napa #11800 Seal into the Passenger side of the pumpkin.
You can get the shafts from TJ's Or the newer body style XJ's.
They were about 60 bucks for both from Pick n Pull.
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A wise man once told me, "I am going to give you some advice; you can take it or leave it, but keep in mind that it is worth exactly what you paid for it"
I just did mine. I tried the method of inserting a socket behind the head of the bolt and it wouldnt pop the hub free. I ended up using a puller with a huge bar to crank it. when it let free it almost popped the entire axle half way out. They looked like original u's and i didnt have a vice or a ujoint tool. I took them to a buds house who had a vice and he hammered them out and pressed the new ones in. As long as you have a vice you can do it yourself. I am not the worse mechanic, but not the best.
I only broke 2 bolts on the actuator. if they are original which they most likely are, just replace them.
i broke the head of one of the 4 bolts taking the actuator off. once the actuator was off the stud threaded out easily with a channel locks. so i replaced that bolt. putting it back on i snapped 2 more bolt heads off with very little tightening torque. off the actuator had to go. got one of the studs out, but the second had nothing to grip so i have to drill it and remove it. didnt have the time or energy so its on with 3 bolts now. I would buy 4 new matching bolts if I had to do it all over.
As others have said, pressing out the old joints and pressing in the new joints shouldn't be that big of an issue, but if you don't want to mess with this, you can always just pull the shafts and have a machine shop press in the new joints for you. I have heard of guys paying as little as $10.00 for a machine shop to press them in. The Harbor Freight ball joint press also works well on U-joints.
this can be done easily with just a c clamp and a hammer or just a vice and a hammer. the only thing most people dont have laying around is a 36mm socket for the rotor and hub. VERY IMPORTANT DO NOT BUY CHEAP CHINA MADE PART FOR EXAMPLE DURALAST. THE SPACING IS NOT ALWAYS RIGHT AND THEY ARE A ***** I RECOMMEND BUYING PRECISION OR SOME OTHER U.S.A MADE JOINT
Any advise if your axle u-joints are original? Looks like mine are. The end caps look fused to the axle and the C-clips are at such an angle that I can't even get a screwdriver, let alone one of them there retaining clip plier thingys, in there.