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Old 04-17-2009, 03:50 PM
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Question rear end question

I have a 2001 f250 4 wheel drive, with a 7.3. (not a dually) Iím wondering what are rear-end modifiers? Is a rear-end modifiers something which comes in the oil or do I need to add it to the rear-end oil (70-140). I have no idea.

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Old 04-17-2009, 04:07 PM
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the friction modifiers help with limited slip. Not exactly sure what it does but if you have a limited slip rear end you will need the friction modifier if you change your oil
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Old 04-17-2009, 04:16 PM
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do you add the modifier or does it come in the oil(what kind(70-140), brand)? how can i find out if i have limited slip?
thanks
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Old 04-17-2009, 04:18 PM
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You need to add it AMSOIL Friction Modifier
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Old 04-17-2009, 04:23 PM
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Would it hurt anything if I add a modifier even if I didn’t need it?
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Old 04-17-2009, 04:23 PM
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NOTE: AMSOIL Synthetic Gear Lubes do not require the use of this additive. However, not all differentials respond the same and if chatter is noticed, the addition of AMSOIL Slip-Lock will eliminate it. For chattering differentials not running AMSOIL Gear Lube, this product is an excellent solution to the problem.
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Old 04-17-2009, 04:26 PM
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If you don't need it don't put it in or just use Amsoil Synthetic Gear Lube and voila.
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Old 04-17-2009, 04:31 PM
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Im about to do mine and Im putting Royal Purple in and it has the modifier already
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Old 04-17-2009, 04:35 PM
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Woo hoo. Royal Purple is good stuff too.
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