which friction modifier do I use

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Old 08-16-2007, 06:18 PM
Joe Styles's Avatar
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which friction modifier do I use

Do I have a clutch-type limited-slip differentials on my 99 f-150 5.4 auto truck,or non-limited slip.
I got that grinding noise when it shifts from third to fourth gear.
Which modifer should I buy

Thank's.

Ford Racing Friction Modifier

Red Line Friction Modifier and Break-In Additives

Currie Enterprises Limited Slip Friction Modifier
 
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Old 08-17-2007, 01:10 AM
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What's the axle code on the door jamb sticker?
 



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