12 bolt lube

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mkpatrick

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Discussion starter · #1 · Sep 12, 2006

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I have a 12 bolt rear end with 4:88 gears. I'm going to pull off the cover and inspect the internals.
What sort of lube is recommended for a 'pozzi' 4:88 rear end. (not sure the difference between pozzi and limited slip, however, have driven and felt what a spool is all about, this definitely aint' no spool)

Anyway?

 

Everett#2390

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1967 RS Bench seat 327/2bbl/PG

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#2 · Sep 12, 2006

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SAE 80W90 and if it has clutches, limited slip, a bottle of GM Limited Slip Differential Additive.

 

big gear head

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#3 · Sep 12, 2006

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Posi and limited slip are the same thing. Posi is Eaton's brand name for their limited slip differential, which is what was installed in all of the mid '60s to early '70s Chevy muiscle cars with Positive Traction.

 

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trex70

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#4 · Sep 13, 2006

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when yo buy your differential fluid, just make sure it is for posi units. If you wanna be safe get the gm additive. I run Kendall 80-90 with a posi unit..no problems....yet

 

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mkpatrick

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Discussion starter · #5 · Sep 14, 2006

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What do y'all think of Royal Purple?

 

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Straight-line-69

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#6 · Sep 14, 2006

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Eaton "Strongly Recommends" the use of conventional (mineral) gear oil in their posi's plus the GM (or Ford) additive,..so ditch the Royal Purple.

 

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mkpatrick

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Discussion starter · #7 · Sep 14, 2006

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Straight-line-69 said:

Eaton "Strongly Recommends" the use of conventional (mineral) gear oil in their posi's plus the GM (or Ford) additive,..so ditch the Royal Purple.

Click to expand...

Will do...

 

big gear head

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#8 · Sep 15, 2006

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Yea, Eaton puts that card in the box with all of their new posi units, but GM uses the Eaton in their new trucks, and all of them have synthetic oil in them. I've been using Amsoil with the new Eatons for many years with no problems.