People are covering the engine... so for your question on the rear diff... unless you have a limited slip... you don't need any special additives. But it looks like you have other issues to address first. Just make sure you change both front and rear diff fluid before driving again. And sooner is better.. even if you are not driving it... the water will separate and start to rust things if it sits long enough.
98 Cherokee Sport- 4.5", AA SYE and TW Shaft, 33" Cooper Discoverer STTs, XCr8000, Jcroffroad Stage 2 Winch Bumper , 60" Hi-lift, Cobra Ultra III, Gragar Soft 8s, Detour Tail Bone, jcr Offroad Stage 2 Sliders, RockCrusher Diff Covers Front, Lockright in the front, Aussie in the Rear (Ford 8.8) with 488s... More $$$ for Bank Account (On Back Order...)
99 Cherokee Sport- Stock and Staying that Way (Wife's DD)
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