Rear Differential Oil ???
I've been looking threw the tech manuals. I can't seem to find what weight oil to put in the rear end. If anyone knows let me know thanks.
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75w-90
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its on the first page of the "front and rear axel" section of the FSM
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And if you have an LSD, you'll need a gear lube intended for use in one or an LSD additive to be used with whatever you bought.
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Cool thanks for the help. Must have missed it on the first page there.
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Originally Posted by RotaryRocket88
(Post 10901400)
And if you have an LSD, you'll need a gear lube intended for use in one or an LSD additive to be used with whatever you bought.
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what kind of additive do you need for an S4 LSD?
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what brand of oil is most popular for the diff? is there a specific type or is it just any 75w-90 oil suitable? is it safe to assume that synthetic is the way to go? what of the lsd additive, is there a brand that is preferred for lsd diffs?
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Originally Posted by cr-rex
(Post 10906120)
what brand of oil is most popular for the diff? is there a specific type or is it just any 75w-90 oil suitable? is it safe to assume that synthetic is the way to go? what of the lsd additive, is there a brand that is preferred for lsd diffs?
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I put redline heavy shockproof in mine :D
Disclaimer: My rear diff is missing 4-5 half teeth and used to whine like crazy. Heavy shockproof quieted it right down, only a very faint whine now and after 11 auto-x events of hard launches the diff is still holding up great :) |
I've seen gear oil at the parts store that they say is good in transfer cases and and race appilications and stuff like that. Is it any good ? I'm talking about the stuff that comes in the tall bottle with the pointed spout.
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Originally Posted by Toxindude
(Post 10906839)
I've seen gear oil at the parts store that they say is good in transfer cases and and race appilications and stuff like that. Is it any good ? I'm talking about the stuff that comes in the tall bottle with the pointed spout.
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I use AMSOIL Severe Gear 75W90 with the AC delco LSD additive from a GM dealership
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It was from Advance Autoparts comes in a white bottle. Who makes the additive for the LSD.
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Originally Posted by Evil Aviator
(Post 10906129)
Yes, synthetic is usually the preferred type for the transmission and differential because the long change interval makes the higher price easier to swallow. However, synthetic makes a lot more difference in the transmission than the differential, so some people just use conventional oil in the differential. I like Red Line, but any of the top name brands would work just fine. I avoid using Mobil One in the transmission because it has been known to eat the synchros, but other than that I am not aware of any brand that is bad.
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Originally Posted by Toxindude
(Post 10907820)
It was from Advance Autoparts comes in a white bottle.
Originally Posted by Toxindude
(Post 10907820)
Who makes the additive for the LSD.
Originally Posted by cr-rex
(Post 10907939)
Thanks. So would I be good just using the redline by itself in my diff or should I use an additive?
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Well I ended up buying Royal Purple gear oil 75w and the additive. I already replaced the old stuff and it all works like a charm.
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Originally Posted by Toxindude
(Post 10908254)
Well I ended up buying Royal Purple gear oil 75w and the additive. I already replaced the old stuff and it all works like a charm.
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Originally Posted by Evil Aviator
(Post 10908073)
You can use Red Line 75W90 by itself, or you can use Red Line 75W90NS and add the limited slip friction modifier to your liking. Anything from Red Line that has "NS" in the name does not have LSD friction modifiers. You can use the NS oil in the differential without the modifier, but it will cause maximum lock-up, which may increase chatter and decrease the life of the differential and oil.
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