which gear oil for xcase/rear

[tarheels23]

Since I live in ohio I dont know which gear oil to get between lightweight or heavy duty shockproof. Someone said the redline heavy duty can only go to 45 degrees, since it gets colder than that here which one should I get?

 

[DSM1G90]

Why worry about the outside temperature? Manufacturers put what is needed in the rear end of their cars for years designed for all sorts of temperatures. But, if you're all worried about temps, put a trouble light with a 100w clear bulb in it to keep the case warm.

Redline GL-5 gear oil will handle any temp - hot or cold. AMSOIL makes an excellent GL-5 gear oil as well.

Just don't put GL-5 in your tranny. Stuff will eat up the syncros due to the high content of sulpher in the oil.

 

[OutKastGSX]

I live in Louisiana so its hot here

I use redline heavy shockproof in the xfer and diff.

Redline mt90 for tranny.

 

[tarheels23]

I'm worried about temperature because I don't wanna go out to my car when it starts getting cold and go to drive it and my transfer case or rear end breaks because the fluid froze.

I already use mt-90 in my tranny and I love it, I would just feel better using redline in my xcase and rear end than using valvoline 80-90w. Just wanted to know which one to get for my temp region

 

[DSM1G90]

Fluid won't and doesn't freeze up.

CRAP ! I've lived out in the farm in weather 30 plus below in the dead of winter and never had to worry about any oil based fluid freeze. My vehicles still operated with no problems.

Only way any fluid would freeze up if it had water in it to aid in it freezing, but we don't have to worry on stupid stuff like that since water and oil hate each other in the first place.

You' have to be way up north in Purdoe Bay in Alaska in the dead of winter for fluid to think on freezing-might be thick, but will not freeze - which is -60 plus below.

 

[atownturbo]

Try to use the search function next time I use redline 75w-90 and mt 90, Reno gets pretty cold and it works wonderful.

Visual Frequently Answered Questions - Home Page
Under miscellaneous fluids faq

 

[DSM1G90]

MT-90 is in my tranny at the present time and still shifts smooth no matter how cold it is outside.

http://vfaq.com/mods/fluids.html It'd be this page to save your search efforts.

 

[tarheels23]

so the car will be fine with heavy duty shockproof?

 

[DSM1G90]

Yes, - it ain't gonna fall apart on you that easy.

 

[dsmspick]

It gets pretty cold in Kansas and I use red line heavyweight in both with no issues.

 

[JusMX141]

NEVER have a heard of a transfer case or rear diff blowing in the dead of winter because the oil was too thick. Something to keep in mind.

 

[DSM1G90]

...might push the thick ooze past the seam gasket if it was that super-duper cold and that is just "might", but never freeze.