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post #1 of (permalink) Old 10-28-2003, 10:24 AM
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what type of lube for 12 bolt

i just found out that the po took the breeather on my 84 12 bolt off! i need to do an oil change on it. what should i put in and do i need a new seal or reuse old seal or silicone or silicone and old seal? thanks
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post #2 of (permalink) Old 10-28-2003, 10:52 AM
ratlover
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Re: what type of lube for 12 bolt

Depends on what you have in the back and if you tow and such. It have a clutch type limited slip in it or a locker or what? Or is it open?

Depends on what you got if you want 80 90w or what(80 90 is used most of the time) and if you need a frition modifier and all that jaz though.
post #3 of (permalink) Old 10-28-2003, 10:54 AM
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Re: what type of lube for 12 bolt

and if you fear contamination I would yank the cover. You will need a new gasket or you can try ultra black RTV. The old gasket will get destroyed. Gasket vrs RTV is kinda like ford vrs chevy.....its all preference.
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post #4 of (permalink) Old 10-28-2003, 01:06 PM
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Re: what type of lube for 12 bolt

its an open diff and i dot tow much its on a blazer. its a 12 bolt truck axle from an 84 the blazer is 83
post #5 of (permalink) Old 10-28-2003, 04:05 PM
ratlover
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Re: what type of lube for 12 bolt

80 90w or mobil synthetic, but I think it only comes in 75 90?
post #6 of (permalink) Old 10-28-2003, 05:19 PM
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Re: what type of lube for 12 bolt

I'd go with 80w 90, and pull the cover, replace the gasket. Use a little black RTV on the gasket to make a good seal.
And since you're doing one axle, you might as well do the other. The minimal time and effort will be worth it.
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