How often do you change your diff fluid?

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Dec 4, 2007 | 08:57 PM

#16

Flying Finn

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Joined: Nov 2007

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From: Miami Beach, FL

BTW, why is the front not synthetic? I thought i.e. 75w-90 Mobil would be good, no?

Last edited by Flying Finn; Dec 4, 2007 at 09:01 PM.

Dec 5, 2007 | 10:43 AM

#17

Eng1Driver

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Joined: Dec 2006

Posts: 366

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From: Rhode Island

Quote:

Originally Posted by Flying Finn

BTW, why is the front not synthetic? I thought i.e. 75w-90 Mobil would be good, no?

I guess it would be fine. However, I know that GM pickups and SUV's required you to change out a breather tube cap on the front axle to be compatible with synthetic oil. I'm not sure if Ford has these foolish issues or not so ask around.

Dec 5, 2007 | 03:15 PM

#18

blackhat620

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Joined: Dec 2003

Posts: 4,196

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From: Arizona

Quote:

Originally Posted by Flying Finn

BTW, why is the front not synthetic? I thought i.e. 75w-90 Mobil would be good, no?

You can use synthetic in place of dino lube with no problems. FMC uses dino to save a little money. The rear axle was changed to synthetic from the factory mainly to prevent premature failures they were experiencing a number of years back.

Dec 10, 2007 | 03:44 PM

#19

Flying Finn

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Joined: Nov 2007

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From: Miami Beach, FL

Quote:

Originally Posted by blackhat620

Thank you!

Dec 15, 2007 | 12:32 AM

#20

oltrucker

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Joined: Dec 2007

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use 90-140 synthetic gear lubean just bout forget about it. get heavy industril magnet ond get it inside the case or get a magnetic drain plug if there is a plug on axle. road ranger big truck transmission actully cst in magnets inside the trnsmission housings. that will take care of tiny metal stuff.