I just completed a dual-case install on my daughter's 82. I used the stock x-member but I had to message it with an 8# sledge hammer so the front drive shaft would clear. The pounding caused another problem- the x-member bent up on the passenger side so it wouldn't line up with the bolt holes. Simple fix- just drove the EB over it to straighten it out. Fit perfectly <IMG SRC="smilies/smile.gif" border="0"> The main problem with using the stock x-member is that the rear case has zero protection. Some sort of skid plate will be in order.
You can run the stock crossmember. I used mine for almost a year on my dual cases. Driveshaft just rubbed a little.
But like everybody else said, the rear case will get beat on. As soon as you can get the money get a budbuilt crossmember. It will support both cases and protect them from the rocks. I just put one on my 83 a couple weeks ago and i love it.
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