front diff operation

[ddgts68]

Didn't now we had owners manual. Have control trac system. It does not say to add anything other 75/90 oil. Also does not say to add modifier to rear either!

 

[1955moose]

Friction additive is for rear differential. Most Expeditions use a limited slip rear differential that requires it, along with the proper weight and type. I believe short of finding it on the internet, the additive is dealer only purchase.

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[ddgts68]

Yea I put it in the rear diff, owners manual doesn't say to put in the rear diff either. Previous owner removed front driveshaft because of a front abs sensor going bad. Since I believe I fixed the shudder problem,(believe it had something to do with drive shaft) was going to reinstall front drive shaft after changing fluid.

 

[Plati]

http://www.strutmasters.com/v/vspfiles/SMPages/PDFTSB/LincolnNav97-02PDF/TSB05-23-3.pdf

 

[ddgts68]

Put shaft in today, had it on jacks and front diff would engage about 10 mph. Made all kinds of noise engaging and disengaging probably because it was in air ( no load). Has a slight vibration on deceleration and steering feels heavier but seems to be working. Now I need to find some dirt!

 

[1955moose]

Check your door sticker, if you have the limited slip then yes to the additive. If not then I'm assuming not. Anyone else want to comment on that.

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[ddgts68]

Didn't see anything about it on door sticker.

 

[1955moose]

Look at the tag on the rear differential, it will say 3L73 or whatever gear ratio it is. Being yours is a Awd setup, its very doubtful that it's not limited slip. If the tag doesn't have a L in-between the gear ratio, its standard, and not limited slip. Hope that helps.

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[ddgts68]

Yea I got the rear done and added the modifier. Was trying to figure out the front since I see no obvious sign of a break in the front axle. Didn't know if it had some sort of limited slip in it?