Rear Differential Oil ???
12-15-11, 12:47 PM
#1
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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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12-20-11, 05:43 AM
#8
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?
12-20-11, 06:16 AM
#9
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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.
12-20-11, 12:53 PM
#10
Full Member
I put redline heavy shockproof in mine 
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
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
12-20-11, 07:16 PM
#11
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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.
12-21-11, 04:15 PM
#15
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.
12-21-11, 06:33 PM
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Castrol or Valvoline maybe? It would probably be better if you just went back to the store and wrote down what they had and then searched for it on the internet. Either that, or use my method, which is to just search on the internet first and order it delivered to your house.
Red Line, Amsoil, GM (AC Delco), Ford (Motorcraft and Racing), Kendall, a bunch of off-brands, and probably a whole lot more that I don't know about. You shouldn't have trouble finding it.
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.
Red Line, Amsoil, GM (AC Delco), Ford (Motorcraft and Racing), Kendall, a bunch of off-brands, and probably a whole lot more that I don't know about. You shouldn't have trouble finding it.
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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Therealmogwai (05-21-21)
12-22-11, 07:59 PM
#19
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.
for direct and straight forward answers. i REALLY appreciate it...
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