Rear and front diff fluid - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 05-01-2011, 06:41 PM Thread Starter
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Rear and front diff fluid

I am going to change fluid in the rear and front diffs and will use royal purple with additive. My question is whether or not I need to add more friction additive or if what royal purple puts in their product is sufficient.

2001 F350 7.3 Dually CC Longbed AFE Intake, aftermarket trans cooler
Auto Meter Sport comp gauges pyro, trans, boost
4"turbo back w/ cat delete.
6pos TW tune,W/W,foil delete






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post #2 of 3 Old 05-01-2011, 06:45 PM
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You don't need anything in the front for sure , it's an open diff . The rear I never put it back in unless I get some chatter but you shouldn't need it . Just put the Royal purple in and drive it . If on sharp turns you feel the rear end "popping or chattering" then add the friction modifier . If you add the modifier get it from Ford , the other brands don't seem to work . Just so you the modifier is only to allow the clutches to slip . This is only for sharp turns . It does nothing else .

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Last edited by Bad Night; 05-01-2011 at 06:49 PM.
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post #3 of 3 Old 05-01-2011, 07:04 PM Thread Starter
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Now thtas exactly what i needed to hear. Thanks man

2001 F350 7.3 Dually CC Longbed AFE Intake, aftermarket trans cooler
Auto Meter Sport comp gauges pyro, trans, boost
4"turbo back w/ cat delete.
6pos TW tune,W/W,foil delete






Hey Obummer, Dont spread my Wealth, Spread my work ethic.
Munks96stroker is offline  
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