[Troy]

I just lifted my 1979 F-150 Long box 4" and now my rear driveline is vibrating between 45 & 50 mph and the front driveline is insanely bad! It feels like an off balance washing machine when I put it in 4 wheel drive. Before the lift the rear driveline vibrated between 50 & 55 mph but the front was smooth up to 50 mph (Hunting/chasing antelope across the muddy prairies in Montana).

I've replaced the U-joints front and rear and it still vibrates.

I think the problem is that at some point in time the previous owner of my truck didn't want to replace 3 u-joints per driveline so the cheap a*s converted it to 1 u-joint per end.

Should I have driveshafts with Cardan joints at the transfer case built up? How about Double Cardan drive shafts?

What is everyone else using on their Long box 79’s with 4” of lift or better? Did anyone have to use axle shims to realign the rear pinion angles with a 4" lift?

Thanks for he help,