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Power Strokes
Aftermarket Super Duty 1999 - Current
Diff fluid change
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[QUOTE="Zmann, post: 867918, member: 2025"] I can't see any reason to add the modifier specially if the lube you choose is not Ford and already may have a LS additive but either way you Should monitor the sounds otherwise just adding modifier when it's not needed can lessen the ability of the limited slip. now if you don't want a customer to come back with a sound complaint then some shops may dump it in? a bottle of modifier is 4oz and be forewarned it smells like all hell [/QUOTE]
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Power Strokes
Aftermarket Super Duty 1999 - Current
Diff fluid change
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