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Old 04-22-2002, 12:57 PM   #1
Ginseng
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Thumbs up Redline Tranny & Diff Fluids

I just had Redline 75W90NS put in the tranny and 75W90 in the rear diff. WRX with 13 months and 30,300 miles of hard highway and some city driving.

Conclusion, a highly recommended fluid for you hard shifting 5MTs. The greatest benefit came from increase in the speed and smoothness of the synchro engagement. This resulted in faster and smoother up and down shifting. Honestly, it made my transmission feel as good as or better than new. It did not seem to reduce noise once your were in gear, but coming out of and going into gears is now smooth and fast like teflon coated butter through a goose.

On the flip side, it did nothing to help the "can't get it into first gear when rolling at more than 10 MPH" problem.

All in all, highly recommended for your 30K change, or sooner. And at about $44 for the fluids worth my money.

Wilkey
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Old 04-22-2002, 01:32 PM   #2
Drexel
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Default NS

I am curious as to why you used the NS w/out any friction modifiers in the tranny?? How is it hooking up? I was also under the impression that the rexes were using diff oil w/out friction modifiers? I put the Shockproof Superlight in the tranny and the NS in my Diff and all seems well. The tranny is very smooth but the reverse issue is stilll there. I can shift into first much sooner now than i could before though. Not a huge change but i run our local track once a week so its peace of mind more than anything!

www.midamericamotorplex.com

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Old 04-22-2002, 03:44 PM   #3
Ginseng
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In searches, the 75W90NS appeared to be a good choice for reliable MT synchro operation. In fact, the Redline bottle implies that this is the fluid of choice for the gearbox. I found that the synchro operation is very smooth and very fast with this fluid. As I knew the change was coming, I paid particular attention to the shift quality pre and post change. I'm satisfied so far.

Redline recommends the 75W90 for hypoid and LSD gearsets. Since the LSD operation is somewhat more difficult to sense in normal driving, I'll have to pay attention over the long run.

Reverse seems to engage about the same as before, maybe just a bit smoother. But then again it's only been 100 miles and I've only been in reverse twice. I'll be back with more impressions over the next day or so.

Wilkey
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Old 04-23-2002, 07:30 PM   #4
Ginseng
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Thumbs up

Well,

It has now been two days and almost 400 miles after the switch to Redline driveline fluids. All I can say is wow. The tranny just gets silkier. And another benefit, getting it into reverse is now almost completely trouble-free. The reverse gear on this WRX had been balky since day one. Sometimes it took (de)clutching and jockeying the shifter towards reverse once or twice before it went in. Oftentimes it made a very audible "crunch" as it went in. Now it just slides right in. No slipping out of gear, just smooth, smooth, smooth.

Wilkey
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Old 04-25-2002, 02:26 AM   #5
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Default Re: NS

Quote:
Originally posted by Drexel
I am curious as to why you used the NS w/out any friction modifiers in the tranny?? How is it hooking up? I was also under the impression that the rexes were using diff oil w/out friction modifiers?
Drexel
Since Ginseng is doing lot of highway driving he doesn't need a tranny oil with too much friction cuz most of the time hes not gonna be changing gears. Friction is good for synchros but not as great for bearings; vice versa for friction oils.

Diff oil you MUST USE frictionless oil.


COBB Gear Oil Article
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Old 04-27-2002, 09:37 AM   #6
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Someone emailed redline not too long ago and redline said to use 75w-90 NS in the front and 75w-90 in the rear.

I love my redline differential fluids. Thier consistency is great. Even if it's -10F outside and your car is cold, the shifter action is still like warm butter. And the shifter feel does not change from -10F and a cold car to 100F and a car running WOT. Great great stuff.
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Old 04-27-2002, 12:19 PM   #7
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Nixx,

Yeah, i was pretty sure you should be using the NS in the DIff, glad some else caught that!

Drexel
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Old 04-28-2002, 01:14 PM   #8
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I am running NS in the rear diff. Is this bad? Should I change it?
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Old 04-29-2002, 12:09 PM   #9
Ginseng
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no_rex,

I don't think you should have any real difficulty with NS in the rear diff. In fact, I've heard that some people actually put in a blend of NS and non-NS in the rear diff to promote more aggressive lockup. The NS is the formula without friction modifiers and thus is not as "slippery" as the regular, hence the NS or non-slip designation.

Wilkey
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Old 04-30-2003, 07:48 PM   #10
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I should point out that I talked to a technician at Redline and he said the Cobb article was flat-out wrong about MT-90. MT-90 and MTL are GL-4 oils that should not be used in a Subaru transmission. He also said Shockproof has solids that are bad on the synchros and the best choice was 75W90NS in both tranny and diff, since Subaru LSDs are not clutch-type LSDs that need friction additives.
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Old 05-02-2003, 04:42 PM   #11
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The limited-slip units are sealed viscous coupling types and are not affected by the type of oil used in the diffs. The purpose of the friction modifiers as in the Redline 75W90 is to reduce gear and bearing friction and lower operating temperatures.
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