Weird metal piece included with the new truetrac diff

69_340_GTS said
How exactly are you supposed to do that with an 8.75" rear end?

I too believe it is the thrust block that is only used on an 8.75" with the old adjustable bearings.

What I was told by the rear end shop was to bolt the axles in place with the center section removed and check the clearance between the axle ends using the plug --I haven't got there yet.