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.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
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