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1999 to 2003 7.3L Power Stroke Diesel
7.3L Power Stroke Diesel equipped Super Duty and Excursion.


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Old Tue, May 25th, 2010, 06:47 PM
epowers777 epowers777 is offline
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Do I need to get friction modifier for my rear dually axle and my front axle they say dana on the caps
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Old Wed, May 26th, 2010, 03:55 AM
hayjayhorses hayjayhorses is offline
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Quote:
Originally Posted by epowers777 View Post
Do I need to get friction modifier for my rear dually axle and my front axle they say dana on the caps
Only if you have a limited slip or locking differential in the rear. Very unlikely you have a locker in the front. To tell if have a limited slip, jack up your truck so both wheels are off the ground, put in neutral, and spin on wheel if the other wheel spins the same way, you have a limited slip differential, add friction modifier

If the wheel spins the opposite direction, you have an open differential, no friction modifier needed.
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