Differential fluid change - do I need friction modifier?

Wait. Those were seven dots.
Very significant, that.
Spiritual, even.
We should be open to diversity, gentlemen.
(what shit)

Madcowranch said:

Hey Pirate, I got the canister purge valve on the engine ticking loudly, no Check Eng. light. Should I get a new one or just wait til it throws a light? Ford parts wants $60 for a new one.

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Yeah just order it and put it on. They click and go bad but sometimes never ever throw the light.

The rear end doesn't need additive because it has the eletric locker and not the limited slip.

pirate air said:

The rear end doesn't need additive because it has the eletric locker and not the limited slip.

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I don't mean to be purposely contrary, Pirate, but why does the manual call for the additive if it's unnecessary? The requirement for the additive is in the Raptor Supplement for the 2011 models, and they have the electric locker. I personally don't care WHY the additive is required, only WHETHER it is required. You are in effect saying that the factor manual pertaining to the Raptor is wrong.

Hey Rug, nothing about adding a friction modifier in the '10 manual. Just says "Motorcraft SAE 75w-140 rear synthetic axle lubricant".

Just put it in. It won't hurt it.

Red said:

Just put it in. It won't hurt it.

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That's what she said.... lol...

Yukon Joe
www.RUNRAPTORRUN.com

Ruger said:

I don't mean to be purposely contrary, Pirate, but why does the manual call for the additive if it's unnecessary? The requirement for the additive is in the Raptor Supplement for the 2011 models, and they have the electric locker. I personally don't care WHY the additive is required, only WHETHER it is required. You are in effect saying that the factor manual pertaining to the Raptor is wrong.

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Hmmm. Is the post Humvee put up in post 15 the way it's worded? Because that one Humvee posted says for 8.8 trac lock at the end which the rear axle in the raptor is not an 8.8 nor does it use a trac loc. It makes no sense to use friction modifier in the rear diff. The modifier is for the clutch material in the limited slip type lockers and actually allows the clutches to slip easier. With out it, the limited slip will chatter in turns and eccelerate clutch wear. The e lockers have no clutches.

Personally I'd probably skip it in mine, but you will find most aftermarket synthetic diff fluids sold at parts stores already have the friction modifier blended in them.

Rich dump some rocks in that bitch and call it a day!

ISFast said:

Rich dump some rocks in that bitch and call it a day!

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I drove all the way to Tulsa yesterday to have Jason do an alignment for me and the stinkin alignment computer was broke.

That sucks! What the hell was wrong with it.... ate up with the *******?

---------- Post added at 06:46 PM ---------- Previous post was at 06:45 PM ----------

Oh and i didn't put anything but Amsoil in the front and rear of my 2010.

---------- Post added at 06:47 PM ---------- Previous post was at 06:46 PM ----------

I mean rocks...