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4x4Poet · 03-03-2006, 09:22 PM

Any GL-5 gear oil for the diffs and NP205 transfer case. 80-90w is a good compromise between 75-90w and straight 90w. The TH350 auto trans fluid should stay separate from the adapter and xfer case if the seals do their job.

If either diff has a clutch-pack limited slip, then limited slip additive is warranted.

03-03-2006, 09:22 PM	#2
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Re: Fluid question Any GL-5 gear oil for the diffs and NP205 transfer case. 80-90w is a good compromise between 75-90w and straight 90w. The TH350 auto trans fluid should stay separate from the adapter and xfer case if the seals do their job. If either diff has a clutch-pack limited slip, then limited slip additive is warranted. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.