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post #1 of 6 (permalink) Old 12-19-2010, 12:28 AM Thread Starter
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friction modifier in differential?

I got new mag-hytec diff pans for my truck and Im changing the differential fluid. The manual says 75w-140 for the rear and I forget what it is for the front but it doesn't say anything about using any kind of friction additive. Do I need to use any? if so how much? Im gonna use Valvoline fluid or maybe amsoil if I decide to drop the extra cash to buy it and go pick it up. thanks for the help

2008 Ford F250 6.4 PSD. Spartan 350, 5inch Flo-pro, downpipe, AFE stage 2, Intercooler pipe, ZEX nitrous, TS-MP8, Elite wastegate/EGR delete, ARP studs, CFM plenum, pro comp trac bars, Airdog 150, ATS 5-star, Mag-Hytec pans, Readylift, 35's, Road Armor front, Fab four rear bumper.
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post #2 of 6 (permalink) Old 12-19-2010, 12:29 AM Thread Starter
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Re: friction modifier in differential?

whoops this was supposed to go to the 6.4 section. any answers here?? please move thanks.

2008 Ford F250 6.4 PSD. Spartan 350, 5inch Flo-pro, downpipe, AFE stage 2, Intercooler pipe, ZEX nitrous, TS-MP8, Elite wastegate/EGR delete, ARP studs, CFM plenum, pro comp trac bars, Airdog 150, ATS 5-star, Mag-Hytec pans, Readylift, 35's, Road Armor front, Fab four rear bumper.
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post #3 of 6 (permalink) Old 12-19-2010, 04:31 PM
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Re: friction modifier in differential?

only if you have a limited slip rear diff will you need a modifier.

Save the money on the Amsoil crap and you will be fine with the Valvoline
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post #4 of 6 (permalink) Old 01-09-2011, 03:56 PM
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Thumbs up Re: friction modifier in differential?

Quote:
Originally Posted by Sequential6.4L View Post
I got new mag-hytec diff pans for my truck and Im changing the differential fluid. The manual says 75w-140 for the rear and I forget what it is for the front but it doesn't say anything about using any kind of friction additive. Do I need to use any? if so how much? Im gonna use Valvoline fluid or maybe amsoil if I decide to drop the extra cash to buy it and go pick it up. thanks for the help
AMSOIL Severe Gear 75w-140 already has the additive in it, which will work great in both diffs.


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post #5 of 6 (permalink) Old 01-09-2011, 04:39 PM
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Re: friction modifier in differential?

Even Amsoil says try without it and if you have chattering to add it then. For what it's worth I have never had to add any to any of my newer trucks (04 up) but I have a few vans with the LS that will rattle your teeth without it. Seems to be a case by case basis.

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post #6 of 6 (permalink) Old 01-09-2011, 07:25 PM
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Re: friction modifier in differential?

Quote:
Originally Posted by Coueshunter View Post
only if you have a limited slip rear diff will you need a modifier.

Save the money on the Amsoil crap and you will be fine with the Valvoline
Amsoil or Mobile 1.

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