The spring limits the slip a little, but the differential works mostly during the application of power. This causes the spider gears to push on the side gear, which in turn engages the clutches.

[Petteri Aimonen] presents for us a modular differential probe, as his entry into the 2021 Hackaday Prize. This project shows a simple and well polished implementation of a differential-to-single-e… ...

Differential fluid, also called gear oil, is the fluid that is poured into the rear differential housing. It needs to lubricate the clutches, gears, and bearings in the rear end.

Fortunately, you only need to change this oil every 30,000 to 50,000 miles.⚠️As always, check your owner's manual for the exact frequency you should service your differential. Every car is ...