1 Ol’ Blue my ’71 LS powered offroad truck has been giving me some bad driveshaft vibrations over 50 mph while decelerating. Looking into it further, I discovered that my pinion angle needed adjusting. Read more to see how I fixed it. DIY Driveshaft Vibration FixJune 15, 2015 in FABRICATION PROJECTS / OL' BLUE tagged 4x4 / AXLE / Custom / Driveshaft Vibration / Fabrication / Leaf Spring Shim / Metal Fabrication / Mig Welding / Off Road / Offroad / Welding by Paul