rear end fluid
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Junior User
Joined: Jul 2002
Posts: 86
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From: Anaheim USA
rear end fluid
I have a 2000 V10 F350 with the limited slip 3.73 rear end. Ford says to use synthetic 75-140 gear oil. My Ford dealer has it for $18.00 a quart! (I have the Mag-Hytec cover so I need 6 quarts).
I can get Mobil 1 synthetic gear oil for $7.00 a quart but it is 75-90.
Does anyone know if the weight difference would cause any problems? I live in Southern California so the temperatures are not too extreme.
I can get Mobil 1 synthetic gear oil for $7.00 a quart but it is 75-90.
Does anyone know if the weight difference would cause any problems? I live in Southern California so the temperatures are not too extreme.
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
make sure you use 75-140 as V10man says.. synth any brand will do. They do make gaskets for the rear and use the right stuff gasket maker in a can..you need friction modifier also...??
Senior User
Joined: Jan 2004
Posts: 336
Likes: 0
From: 29 Palms, CA
I used Redline synthetic fluid on both differentials when my truck had 107K on it, seems good to go.
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Posting Guru
Joined: Nov 2002
Posts: 1,222
Likes: 4
From: Texas
V10 man has it right. Your cover should have the drain plug so you don't have to bother taking the cover off. I have used Amsoil in my last 4 trucks, never a problem.
Synthetic in diffs should be good for 100K or lifetime if not submerged in water. Continual heavy towing may shorten that time--the rear diff gets very warm under load.
Synthetic in diffs should be good for 100K or lifetime if not submerged in water. Continual heavy towing may shorten that time--the rear diff gets very warm under load.
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