rear end gear oil

been researching this on net for 2 days now;;..i'm ready to put gear oil in my floater 9" rear end.in my fuel altered with est. 1600hp[high side].what oil is everyong using and why?i've read to use red line shockproof synthic and read to use just 80wt-90wt gl5 from local parts store.because it with stick to gears better and desipate the heat and shock better;.very confussed here..just a simple thing;;lol;;maybe just putting to much into it???i won't get to race every weekend like most you do if that makes a differance..also if you call richmand or strange on there web pages the say no to synthic..

 

I think you will be more than fine with the redline shockproof!

 

Unless the "Redline shockproof" is somehow different than other synthetics, you want to avoid it.
Mark Williams will give you the rundown on synthetics as they say don't use them. [PERIOD!!]
I have seen more than one rear end gear failure in both racing and heavy duty applications due to the synthetics, gears burnt up in less than 20 passes, or one tow across the state.
The conventional 90w (or 75w-90) was designed for the hypoid type gear and for some reason does way better in high load applications.
It is possible that the people at Redline figured out what was lacking and fixed it, but for my money ($0.02) why put a more expensive oil in a place where it "might" be as good?

Kendrick

 

Rearend Oil

I run the redline oil with the friction modifier also ( a small little bottle ). I run a top alcohol dragster with over 3000 horse and have no problems in the eight years I have been in the class. I would never run anything else. We had a 9 1/2 inch gear with over 90 passes on it. One thing I was tought to do is run the oil level a little above the center of the axle so when you take off the front pinion bearing will not get starved for oil. Just my 2 cents. Richard Putz

 

Agree, best we have ever run! No problems and long gear life.

 

Redline Shockproof is the best we have ever used......great stuff. we run a little more, like Richard says.

 

Been a long time away from this board. I have had very good luck with synthetic and shockproof is the way to go. In my personal opinion I feel that running a synthetic will allow you to run the gears way tighter than you can with conventional lube ( This is the technique I employ on setup) without damaging the gear surface due to heat breakdown of the lubricant. This in turn will reduce the shockload to the gear surface when tire shake occurs. I have only worked on a 2000hp dragster so my experience is limited but with a conventional 9" gear we have run 3 seasons and just pulled the gears out and they were free of cracks so I can't be completely off base.

 

Redline Heavy Shockproof is what I'd run. I have used different types of Redline gear lube in just about every type of drag car, passenger car and light truck (up to one tons) applications with zero problems. I have to seriously question anyone who claims that a QUALITY synthetic lube of any type in any application will cause a problem as long as it's correct for that application. I've never heard an explanation that makes any sense. The old "it's too slippery" thing is total nonsense if you get the correct lube for your application.

Joad Donnelly

 

Royal Purple Max Gear

I have used RP Max gear for many years never an issue. I run it in the truck diffs. and the trans. also, not one problem.

 

we have used the same Redline diff oil for 6 years, must take the head out and have a look one day.... (1600HP Chevy, 1500kg car)

 

My input is Redline Shock Proof is the way to go.
Redline offers less rotating resistance and great cling.