This spacer tool that is shown in the shop manual for checking the clearance on the pinion gear (spacer tool J-4050). Do I need this for a rebuild if I'm reusing the same gears? The way I read the text it is only needed if installing and setting up a new pinion gear.John
If you do not use the spacer during installation the rear pinion bearing will not be forced far enough into the housing and it will wear on the front of the pinion gear. I don't remember with a 3.9 but some times you can use a punch between the teeth and drive the bearing forward.
Where are you located? I have a stack of the spacers. I could mail you one.
You could also make up a simple tool/spacer.
