So I ordered this the other day after researching a number of older posts about converting over to a double u-joint shaft and getting rid of the rag joint in the stock FSJ shaft:
https://www.amazon.com/gp/product/B000F ... UTF8&psc=1
I went to put in in last night and after pulling the stock shaft, I found out that this one is indeed too short to fit my application. I believe I am running the original steering box on my 1978 Cherokee, which I believe would be the J10 box. Also not running a body lift. The column side of the CJ shaft seemed to be the right size, but the steering box collar seemed to be a little too big, although I did not begin to torque it down. Once again, it was too short to reach on both ends.
Also, in removing the stock shaft, the clip that holds the rubber "boot" where the lower shaft telescopes into the upper shaft broke in half. I did not think this was too big of a deal, so I just replaced it with a zip tie. Snugged it down enough to where the boot would stay in place and the shaft could slide decently.
Hope this helps for those that may want to swap out their stock shaft. If I got the wrong shaft, please point me in the right direction as I would still like to swap my original shaft out since there is some decent play in the original upper u joint. From my research this is a common problem for all of us.
Also, for those removing the stock shaft, make sure you remove both bolts in the collars to be able to both remove and install the shaft back onto the splines.
Ok, I have mentioned shafts too many times in one post....