QUOTE(mgphoto @ Aug 18 2022, 08:56 AM)
The backlash is what needs to be set when changing differentials.
The new differential will be a different size requiring different size spacers. The spacers vary by .1 mm with an additional shim at .05 mm.
Measurements start at .1 mm larger on the ring gear side and adjusted by changing spacers to get the correct backlash.
I agree... you may need to measure the side play and the shims mentioned in your thread to fit the new diff.
but the ring and pinion are set using back lash in the forward/rear directions.
the factory tool is expensive, and its a complicated process when changing the spool.
others have taken a spare trans case and cut a window in it in the past... to allow measurements of backlash. or the factory method.
usually best preformed by a professional with experience.
brant