Rear diff amount of fluid?
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Master of Strokes
Joined: Mar 2007
Posts: 6,808
Likes: 25
From: CA
Rear diff amount of fluid?
Alright on the 450 I need to know much much diff fluid I need. It says on the build sheet limited slip rear end but when the shop tore it apart they said that I have an Eaton locker in it 
So its got the 4.30 Gears in it and I don't need a friction modifier right. Also does any one know what weight oil to use?
Thanks
Nick
So its got the 4.30 Gears in it and I don't need a friction modifier right. Also does any one know what weight oil to use?Thanks
Nick
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
What axle does the 450 have? I think the duallies use the Dana 80. I think that's similar to the Sterling 10.50 I have, but I'm not sure of the Dana's exact specs. Hopefully somebody can add some info.
At least it's another bump for ya.
At least it's another bump for ya.
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
Page 383 of the 2008 Owner's Guide
14 pints, 7 quarts, or 6.6 liters. 75W140 synthetic gear oil.
As for the friction modifier, here's what it says:
Originally Posted by Ford SD owner's guide, Page 386
1Add 8 oz. (236 ml) of Additive Friction Modifier XL-3 or equivalent meeting Ford Specification
EST-M2C118–A for complete refill of limited slip Ford axles. Ford design rear axles contain a
synthetic lubricant that does not require changing unless the axle has been submerged in water.
EST-M2C118–A for complete refill of limited slip Ford axles. Ford design rear axles contain a
synthetic lubricant that does not require changing unless the axle has been submerged in water.
