The dealership has those thick steel washers/shim for about 8 bucks each. Measure the thickness of your present 2 steel "washers" and factor in the backlash and order the right thickness. That's one way.

Another is to get a dana44 pinion shim kit maybe from Randys. Should be very reasonable....the outside diameter is perfect.....bet they can sell them by themselves. I'm 94% sure it's the dana 44 shim pack.....shims vary in thickness from .003 on up.


EDIT------------just re-read post....OK....I see you went the dealership route. That is kinda strange that the thickest shims didn't work. Wonder what that's all about. Sounds like a call to Randys.