On a 4 link doesnt the pinion if its set straight/level stay on that same Level plane through out its arc travel.

Im no expert but I think it does. If thats the case then it may be the perfect example to use to explain the pinion angle based off the tranny centerline method.

If it is the case, That the pinion stays at the same angle through out the rear ends arc on a 4 link.

.Only moving up and down on the same Level plane. The Pinion angle is Not changing.

Only the driveshaft and joint angles have changed, not the pinion angle from parralel.

Just a Friendly rear end pinion angle talk mike