Gear Oil

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03-20-2006, 05:32 PM

MichelleBeMyGT

2nd Gear Member

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Join Date: Jul 2005

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Posts: 254

Gear Oil

I'm going to put my 4.10 gears in this weekend. I was wondering what oil to put in the rear differential? What oil weight? Thanks

03-20-2006, 06:06 PM

ShadowDrake

5th Gear Member

Join Date: Aug 2005

Location: Whitehall, Michigan

Posts: 2,638

RE: Gear Oil

75w140. As long as it is close, it's fine. I used 85w140 Royal purple (already had a friction modifier, too).

03-20-2006, 06:20 PM

MichelleBeMyGT

2nd Gear Member

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Join Date: Jul 2005

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RE: Gear Oil

Thanks... Do you know how many quarts it takes? I'm guessing three but idk.

03-20-2006, 06:26 PM

Matts00GT

4th Gear Member

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RE: Gear Oil

I thought it took 75w-90...I didnt know there was a 75-140.

03-20-2006, 06:47 PM

sprostang

I ♥ Acer

Join Date: Sep 2005

Location: Illinois

Posts: 6,190

RE: Gear Oil

The gear oil that comes with the car from the factory is synthetic 75w-140. You can use 75w-90 in its place.

03-20-2006, 07:22 PM

ShadowDrake

5th Gear Member

Join Date: Aug 2005

Location: Whitehall, Michigan

Posts: 2,638

RE: Gear Oil

It took about two and a half quarts before it overflowed a bit. You'll need to buy three quarts.

Manual says 75w140, tag on the diff says 75w140.

For me, 75w90 was too far off.

03-20-2006, 08:31 PM

sprostang

I ♥ Acer

Join Date: Sep 2005

Location: Illinois

Posts: 6,190

RE: Gear Oil

Not to argue, but, 75w-90 is fine. I called ford to find out to be sure. The service guy told me that 75w-90 is even better than 75w-140. (Royal purple) [&:]