Hi. I was reading over your dana 60 swap and was curious if you found the problem of your death wobble yet? If not, I'd bet ya $20 it's because you don't have a track bar. I did the dana swap also and trust me, you want that track bar on there. I also did the rear shackle flip btw. Since the rear flip kit moved the axle forward, instead of moving the front mount of the rear spring, I had custom blocks machined with an offset center bolt (similar to the 1" blocks you used up front)... This however did not cure the shackle angle problem. Basically, as you noticed, the rear shackle is now actually angled a little forward instead of rearward and the rear end rides really stiff. Have you got your truck completely sorted out by now? Sorry nobody had more info for you before you started your project.