Gear Oil Viscosity???
Thread Starter
Slingshot
Joined: Dec 2001
Posts: 3,817
Likes: 24
From: Charlotte NC
Gear Oil Viscosity???
I am planning to replace my tranny and rear axle lubricants with synthetic gear oil and am wondering if I should use 75w-90w or 75w-140w? Any guidance here will be appreciated.
Thanks much.
Thanks much.
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
I use Mobil synthetic 75W-90 in the rear dif. plus two, four ounce tubes of G M Posi diff additive.
Race Director
Joined: Jun 2004
Posts: 13,961
Likes: 707
From: WI
A search turns up this:
http://forums.corvetteforum.com/show...r+oil+additive
Back in 1996 (or other years for C4), GM is going to recommond their fluid. However, their fluid does not contain the additive as it most likely used in other differentials. So, because our differentials are hypoid/limited slip, GM produced an additive (fricition modifier) and it is required (back in 1996) for use with their fluid.
Present time, most differentials are hypoid/limited sillp and therefore most of the aftermarket fluilds (redline, mobil1, castrol,...) already have such friction modifiers since that's the majority of the market.
nogoodsam
Another topic:
http://forums.corvetteforum.com/show...r+oil+additive
There are a lot more.
http://forums.corvetteforum.com/show...r+oil+additive
Back in 1996 (or other years for C4), GM is going to recommond their fluid. However, their fluid does not contain the additive as it most likely used in other differentials. So, because our differentials are hypoid/limited slip, GM produced an additive (fricition modifier) and it is required (back in 1996) for use with their fluid.
Present time, most differentials are hypoid/limited sillp and therefore most of the aftermarket fluilds (redline, mobil1, castrol,...) already have such friction modifiers since that's the majority of the market.
nogoodsam
Another topic:
http://forums.corvetteforum.com/show...r+oil+additive
There are a lot more.
