Need quick advice. (Axle/Tranny Fluid)
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Eats, Sleeps, Dreams Rotary
Joined: May 2003
Posts: 3,639
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From: MIA
Need quick advice. (Axle/Tranny Fluid)
Got redline 75w/90 and 75w/90ns. I was planning on using the NS in the differential and the regular in the tranny. I live in Miami, were temperatures are usually always over 90 degrees.
Rotary Freak
Joined: Dec 2001
Posts: 2,402
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From: chandler, AZ
I think NS is for non slip so you'd use in an open diff? correct me if I'm wrong. I think that is what the guy from the local speed shop told me. I just used the straight up 75w90 gear oil in my diff.
Still on 1st engine
Joined: Jun 2003
Posts: 1,176
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From: SoCal
From Redline's site:
75W90
Our most popular gear oil, this is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W90 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W90 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.
Our most popular gear oil, this is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W90 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W90 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.
75W90 NS
This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.
This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.
Junior Member
Joined: Sep 2004
Posts: 11
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From: Canada
Use MT-90 or 75W90NS in the transmission. MT-90 is GL-4. 75W90NS is GL-5. RED LINE says the synchros will last longer with GL-4. Mazda says you can use GL-4 or GL-5 in their transmissions.
Use 75W90 in the differential. 75W90NS doesn't have the friction modifiers for limited-slip hypoid differentials. 75W90 is GL-5. Mazda says you can use GL-4 or GL-5 in their differentials.
Use 75W90 in the differential. 75W90NS doesn't have the friction modifiers for limited-slip hypoid differentials. 75W90 is GL-5. Mazda says you can use GL-4 or GL-5 in their differentials.
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