7374
Well-Known Member
Hey all, getting ready to reassemble my 8.75 and needed to know what fluid to use. It's a sure grip unit and I did get a bottle of the Sure grip additive but just didn't know what fluid everyone is comfortable with.
what differential fluid should go in 8-3/4
- Thread starter 7374
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................I just run regular 80-90....with the additive....some run full synthetic....u have a few choices of grades........kim........
damnimcooltom
Too Cool For School
DoctorDiff recommends 85-140, with a bottle of the additive you've got. That's what I always use.
I'm cheap. 80/90 has worked well for decades. To hell with that high priced crap. It's all about marketing anyway. Save your money. 80/90
Locomotion
Well-Known Member
I run synthetic Amsoil Severe Gear 75w-90. Although brand name conventional fluids offer good protection, synthetics tend to be better and provide extra insurance under heavy duty/performance use. They also tend to run cooler. I have the stuff in my race car 8 3/4" as well as my Dodge dually. The thinner stuff will free up a few extra HP over the thicker viscosities and it has a friction modifier in it for sure-grip/posi rear ends. But one can add their own as well if it needs more. My differential guy likes the stuff as well and I've reused bearings a couple of times between gear changes.
http://www.thelubepage.com/severe-gear-75w-90
http://www.thelubepage.com/severe-gear-75w-90
grimreaper
Cross Member
Some of the synthetics don't stink so bad, which may be of some value if you change gears or are into the differential frequently.
416stroker
Well-Known Member
I bet the whale would argue that point with you...loo!
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