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Those are tough to re-build and not still have a leak. Auto zone/Advance and others sell a re-build kit, but they also sell re-built boxs. I sugest getting a re-buit one and save a lot of effort taking it on and off trying to get the re-build right. I put on an AGR Superbox2, it was a huge improvement.
First, the only place I could find rebuild instructions was the Jeep service manual. I went to 3 different "chain" auto parts places, and could not find a decent kit. Finally, I went to a "mom & pop" place and got one. When I tore it apart, the bearings ended up being just a little different, and a couple of pieces were not included. I got numbers off of the bearings and tried to get it cross referenced, to no avail. I even made a couple of spanners to get it apart. I lost a couple of the ball bearings, and had to go to a bearing house to get some (Free!). I got it back together properly with the new pieces that would fit. It looks really neat, but I'm sure it will leak (we are finishing a frame-off, and haven't installed the motor yet). At the end of the day, I've got a $75.00 kit, 2 days time, and $20.00 worth of gas in a $165.00 part. BUT, By God, I know how to rebuild one!!! I'll hook this one up and try it before I put the front clip on, just to make sure I've failed. Then, I'll go buy a rebuilt one like my cheap a@# should have done to begin with. I have become quite certain that I will never learn. Hope this helps! - Dwain
I have to replace my steering box also. I am thinking about using the one from a Grand Wagoneer. I have been told it is very similar to the AGR Superbox. I am going to the parts store today for a direct comparison. I will post my findings.