That works great till you get an aftermarket pinion, they measure by actual depth.
I copied the dealership tool, and made the carrier bearing sizes in chev, Ford, Dana, so it works on all diffs, including Toyota.
The small square flat piece is exactly 0.050" to transfer the end of the pinion gear over to the center of the case, where the machined "flat"
center of the cross shaft.
( Hope that make sense)
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