I recently Bought a rear end for my chevy and its got 3.40 gears, 10 bolt, and its a Locked differential. My question is, how much of the posi lube should i use with the gear oil and should i use 80 90 gear oil?
Thanks

 

Locked as in spool type, actual locker, or limited slip(posi)? limited slip is the only one that needs the additive. I would go with synthetic no matter which you have.

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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

[This message has been edited by 82camaro (edited April 10, 2001).]

 

And I assume the actual ratio is 3.42.

The normal dose of the additive is one tube for petroleum and most synthetic lubes for one fill (put the additive in, then fill to the bottom of the hole with gear lube). If you go with AMSOIL Series 2000 75W90 gear lube, you don't need the additive. Assuming this is a clutch-type limited slip carrier: If something like a PowerTrax, you again don't need the additive.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" Hedders, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere w/open diff & slipping tranny. Daily driver while Camaro was being put together.