+1 on that Sim.
If you find yourself loosening the diff because it feels gritty, even after you clean your diff balls and ring, you might want to check the thrust bearing as well. I clean out my diff quite often but I found out recently that it was because the thrust bearing wasn't being cleaned as thoroughly as my diff ring and balls that was causing my diffs to feel clicky.
Diffs should not be too tight but should also never slip. There's a gray area between it and you can find out by "how it feels" within the region that it's not slipping as you hold the two ends down and trying to rotate the gear as Sim stated...
It's good advice, I use the same trick, I just stick in two cheapo L-wrenches on the ends and try to hold the two ends steady with one hand and try to rotate the gear with as much force as possible with the other hand. Your finger may hurt a bit so applying a towel over the gear teeth may alleviate some of the pain it may cause.
The hand test is good but just remember that if you have a hot brushless setup, by the time the gear reduction takes place in your spur and pinion, there's a lot more torque exerted onto the diff often times when your vehicle is at a standstill or while braking...
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