Ford F250 rear diff fluid type/amount

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Mar 16, 2007 | 09:13 PM

#16

John311t

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When i changed my fluid, i did not add any friction modifier. The LSD still works, and i do not get chattering or any wierd noises at all. Is there any problems with this or should i go ahead and add the modifier because i thoguht the modifier just helped with noise?

Mar 16, 2007 | 10:16 PM

#17

ernesteugene

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From: Fulltime RVer

What is the correct amount of friction modifier?

Cgl posted....... Be sure to add 8 oz. of Additive Friction Modifier (Ford Part Number XL-3)

KrenzyRyan posted.......4 oz of Ford's XL-3 Friction Modifier

My owners manual says 8 oz per 3.5 qts, but my Mag-Hytec says 4 oz for 3 qts?

Maybe they don't lock up so well if 4 vs 8 is correct and we put in X2 too much?

Mar 17, 2007 | 07:05 AM

#18

DISLFVR

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From: Mid Oh. Ponderosa

I'm in need of replacing the cover on mine and plan on one of the Oasis covers and Royal purple fluid, how much modifier to add??? Any thoughts? Or add till it quits chirping in tight turns. Thanks guys

Mar 17, 2007 | 07:31 AM

#19

Uzumati

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From: Central, Al

With Royal Purple Max Gear add 0.00000 oz of friction modifier. Its already in there

Ernest after finding the 3rd different capacity in a 3rd different manual I switched to the RP and havent worried about it yet

Last edited by Uzumati; Mar 17, 2007 at 07:33 AM.

Mar 17, 2007 | 08:04 AM

#20

DISLFVR

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From: Mid Oh. Ponderosa

[QUOTE=amiller93]With Royal Purple Max Gear add 0.00000 oz of friction modifier. Its already in there

Thanks, I remember reading somewhere on here about it but was'nt sure.

Mar 19, 2007 | 08:24 AM

#21

mdevers

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Not sure if this is true or not but I heard that your mess with the aggressiveness of the limited slip by adding less friction modifier,I know that to little could over work clutches. I would like mine to lock faster.

Mar 19, 2007 | 11:22 AM

#22

ernesteugene

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From: Fulltime RVer

Quote:

Originally Posted by amiller93

So, how much is in the Royal Purple you now use? Is there a down side to using too much besides the lock up not engaging? I would just as soon have a non-limited slip anyway.

Mar 19, 2007 | 12:22 PM

#23

cgl

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From: NorCal

Quote:

Originally Posted by amiller93

...Ernest after finding the 3rd different capacity in a 3rd different manual I switched to the RP and havent worried about it yet

I've even seen two different quantities in the same manual (4oz and 8oz). I added 4oz (1 bottle) and have had no problems. My service guy says thats all he adds to his own vehicles.