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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by K5Psycho, Jan 11, 2003.
anyone know how much gear oil the front and rear axles take.
About 3qt of something like this /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
Front: 3.5 pts (1.75 qts)
Rear: 4.2 pts (2.1 qts)
Use a GL-5 80W-90 gear lube....unless the rear has a gov-lock. If that's the case, the rear will take some special limited slip lube (I think).
GL 5 has the friction modifer already added to it /forums/images/graemlins/thumb.gif
Unless you have a diff that NEEDS limited slip additive, use GL4. GL5 is the same stuff except it has sulfer added to it (that's what the additive is) which will combine with water to make sulfiric acid. So, if your diffs will see any water, and you don't need the additive, GL4 is safer.
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