Cool ... Thanks for the thread. I am going out on a limb, and am going to try to put the diffs under my YJ frame. Using the donor frame(it's bent anyway) for all the bracketry. I have taken many measurements and the only issue so far is the width of the frame rails at the front differential hump. The yj is approx. 1 1/2 inches wider. I plan on correcting this with a notch and grafting in the TJ spring perch and shock mount. Any other ideas to look out for? The rear shock locations are opposites. TJ to the rear...yj to mthe front. But shock brackets are fairly simple.I will try and post pics as the project progresses if any are interested.