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post #1 of 9 Old 04-17-2009, 04:50 PM Thread Starter
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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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post #2 of 9 Old 04-17-2009, 05:07 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

The Mullet Mod
Stock 2005 F-350 4x4
*Afe Intake
*4" TB Exhaust
*Scangauge
*SCT
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oil bypass
*
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water pump
*Tuned FICM
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post #3 of 9 Old 04-17-2009, 05:16 PM Thread Starter
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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?
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post #4 of 9 Old 04-17-2009, 05:18 PM
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You need to add it AMSOIL Friction Modifier

2001 7.3 SuperDuty Lariat

AFE Stage II Cold Air Intake
PHP Tunes , Autometer Gauges
Zoodad Mod,
4"SS MBRP Exhaust
ITP Overboost Annihilator
Roada Deco Positive Air Shutoff
NADP Heavy Hauler Transmission
6 liter Trans Cooler
Diesel Site Coolant Filtration System


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post #5 of 9 Old 04-17-2009, 05:23 PM Thread Starter
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Would it hurt anything if I add a modifier even if I didn’t need it?
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post #6 of 9 Old 04-17-2009, 05:23 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.

2001 7.3 SuperDuty Lariat

AFE Stage II Cold Air Intake
PHP Tunes , Autometer Gauges
Zoodad Mod,
4"SS MBRP Exhaust
ITP Overboost Annihilator
Roada Deco Positive Air Shutoff
NADP Heavy Hauler Transmission
6 liter Trans Cooler
Diesel Site Coolant Filtration System


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post #7 of 9 Old 04-17-2009, 05:26 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.

2001 7.3 SuperDuty Lariat

AFE Stage II Cold Air Intake
PHP Tunes , Autometer Gauges
Zoodad Mod,
4"SS MBRP Exhaust
ITP Overboost Annihilator
Roada Deco Positive Air Shutoff
NADP Heavy Hauler Transmission
6 liter Trans Cooler
Diesel Site Coolant Filtration System


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post #8 of 9 Old 04-17-2009, 05:31 PM
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Im about to do mine and Im putting Royal Purple in and it has the modifier already

The Mullet Mod
Stock 2005 F-350 4x4
*Afe Intake
*4" TB Exhaust
*Scangauge
*SCT
*
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oil bypass
*
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water pump
*Tuned FICM
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post #9 of 9 Old 04-17-2009, 05:35 PM
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Woo hoo. Royal Purple is good stuff too.

2001 7.3 SuperDuty Lariat

AFE Stage II Cold Air Intake
PHP Tunes , Autometer Gauges
Zoodad Mod,
4"SS MBRP Exhaust
ITP Overboost Annihilator
Roada Deco Positive Air Shutoff
NADP Heavy Hauler Transmission
6 liter Trans Cooler
Diesel Site Coolant Filtration System


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