Had to repair differential in my 2001 Dodge 2wd, 5.2L.
Problem was both front and rear Pinion Bearings.
Could not obtain some tools during Christmas/New Years period.
First Substitute for the Miller Special Tool C-4164 Carrier Side Bearing wrench. Got all parts from Tractor Supply. Used drill press and Welder, but welder could be replaced with drilling 2 pilot holes for locking pins.
Second was a torque assist method of tightening the Pinion Nut.
Use a floor jack under the wrench handle and a piece of tape vertically or horizontally on the wrench head to measure angle of rotation.
Jack the wrench handle while holding the Flange in place against rear spring or floor and monitor the general degrees of rotation of the wrench head.
If the Pinion Nut pitch is 16/inch, each 360 degree nut rotation will generate .0625" travel. Each degree of rotation yielding .0001736" travel.
I expect most everyone here already knows this, but just in case.
Best regards m2a