Differential End Play Measurement
This is a variation on the manual method, using stuff I found in the garage and my new Harbor Freight digital caliper (claimed accurate to +/- 0.001").
First assemble the differential and install the extension housing:
Then I rested this thick, flat metal plate thing with a hole in the middle over the center of the seal:
Then extend the depth finder on the caliper and zero out the distance between the top of the plate and the pinion:
Hold the body of the caliper firmly while prying up the diff through all its travel with a big screwdriver through the VSS hole:
Full travel measured 0.016":
Spec for play is 0.005" to 0.025", so no need to swap in a different thickness selective washer. Test OK.