1968 with T56 and Ford 9" Vibration

[LS short box]

I have a T56 in 68 short box. High hump is a must. Also motor mounts that place the engine as low as possible to reduce engine angle. Also as said above a one piece 3.5" drive shaft will be very close to the trailing arm cross member pass thru hole. I had to trim the top of the hole for more clearance on my 4/6" drop. Also double check the drive shaft balance. My engine angle is about 3.75 degrees. I did not change the stock rear axle angle. I have zero vibrations.