The white is just the color of the grease seal that keeps the grease on the needle bearings.. Most seals are black. About the only to tell if they are worn is to dissemble and inspect. Or (worst case) they fall apart.
1995, 4.0, 5 speed YJ, SOA, TC drop, 8.8 swap with 4.10 and LSD, e-grills bumper, 33" BF all terrains on 15" wheels.