Gear Oil???

[Six0~Stroker]

Ok guys, Im thinking of changing my gear oil (front and rear)... Thinking synthetic with Motorcraft Limited Slip additive. Any suggestions to what I sould get? And what Weight


Thank you in advance!

[RRF985]

I am getting close to doing the same. Most synthetics already have the Limited-Slip additive in it and do not need the Motorcraft stuff. I am thinking of doing Amsoil, Mobil 1 or Valvoline in mine and they all include the limited-slip additive. I'd stick with the 75w-140 for the rear and the 80w-90 in the front but that's just me.

[rentstdi]

I just got the oil and addative at my local dealership
the additive is 5.30
75w140 gear oil is 24.23 per quart--- 3 are recommended

I got it while I bought a new pinion seal and nut

[jcm3]

You can also get them online from Summit, including the front without the friction modifier in it. Redline sells the fluid without it (NS).

I also put down the amount needed, but hopefully someone will sanity check it for me if I come up short.

Front - 80w/90 - 3 qt - $14.95 each, $44.85 total - Red Line Synthetic Oil 58304 - Red Line Synthetic Gear Oil - Overview - SummitRacing.com

Rear - 75w/140 - 4 qt - $15.95 each, $63.80 total - Red Line Synthetic Oil 57914 - Red Line Synthetic Gear Oil - Overview - SummitRacing.com

Came out to $108.65, including shipping. Just an option.

[DoubleDpsd]

Can you use Ford's friction modifier with Redline's 75w140?

And can you get away with using 3 quarts of gear oil or better to get 4 quarts?? I just brough up an old thread and missed this one, my bad lol

[DoubleDpsd]

I also ready I think by S. Carlson that you can use the 75w140 in the front just with NO friction modifier. Can anyone confirm?

[Six0~Stroker]

Originally Posted by darsey715

I also ready I think by S. Carlson that you can use the 75w140 in the front just with NO friction modifier. Can anyone confirm?

I think so but what I am running into is most if not all SYN fluids have Friction Additive already in them...

[Six0~Stroker]

So far my plan is to get Valvoline Synthetic 75w-140 for the rear (4 @ 12.99) , and 75w-90 for the front. (3 @ 9.99) at Autozone.

[DoubleDpsd]

Originally Posted by Six0~Stroker

I think so but what I am running into is most if not all SYN fluids have Friction Additive already in them...

What about this stuff

Red Line Synthetic Oil 57105 - Red Line Synthetic Gear Oil - Overview - SummitRacing.com

[DoubleDpsd]

What about for cold temperatures? Cuz im planning on being up in tahoe this winter, getting down to 10 or 15degrees. Is 75w140 and 75w90 still recommended for cold weather? Thanks.