Just to add:
A ball diff is not a set-n-forget sort of device. The first couple runs on a new or freshly built ball diff WILL require a check & re-adjust. These break-in runs will wear a slight groove into the surface of the Diff rings. Also the spring tension will soften after assembly. This will cause the diff to start slipping within a run or two. Therefore I suggest you get used to setting a diff AFTER it's been installed in your car.
I find it best to test diff tension in the following way:
- With the car held in the air, give one wheel a quick spin with the palm of your hand
- It diff action should stop the spin within 3/4 of a turn on it's own
If you have a brushless, it may be necessary to block the opposite tires from rolling. Due to the lack of magnetic cogging, the brushless motor will NOT hold the spur gear steady when you try to spin the diff.
This test can easily be done with one side of the suspension dissasembled. This means you can make the adjustments on one side of the diff, while spin-testing the wheel on the other side.
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