Hotchkis 80002 TVS System, Sport, 64-66, GM A-Body, Small Block User Manual
Page 12
The centerline of the differential pinion should be parallel to the centerline of the engine’s
crankshaft without being the same line.
FYI… The centerlines should not be the same line because the U-joints would wear in the same areas all the
time. Having an angle at the joint itself allows the joint to articulate and wear evenly along the entire bearing
race.
So, the first thing to do is to find out the angle the engine’s crankshaft is sitting at. One way to do this is to
set a digital angle finder on the front crank pulley or harmonic balancer. Record this angle. Next, set the
digital angle finder on the front flat face of the differential yoke. This angle needs to be the same as the
recorded crank angle. Adjust your Hotchkis trailing arms to obtain the angle needed.
Tighten all hardware and drive the car. Test for driveline vibration by accelerating.
If there is vibration during acceleration, then the pinion angle is set too high!
If there is vibration during braking, then the pinion angle is set too low!