Differential fluid change - do I need friction modifier?

[Ruger]

Thanks, Vash. In your thread (http://www.fordraptorforum.com/f52/transfer-case-fluid-question-3336/#post709372) you mentioned that the spec for the T-case was 7mm (or about 1/4") below the lip of the fill hole. Still agree with that?

I wrote to Chris at FreedomMotorsports because his recommendation figured so prominently in your thread. He hasn't seen my PM yet, but when he does I hope he'll weigh in.

I'm probably not going to replace the front differential cover, but I'm looking to replace the transmission pan with a Mag-Hytec cover as soon as Chris can get his hands on them.

 

[Drunktank]

Which Amsoil Diff Fluid?

Was going through the Amsoil site and I noticed its calling out two different fluids for the front and rear diffs.

For the rear is calling for Severe Gear 75W-140 SVOQT
AMSOIL Severe Gear® 75W-140

For the front its calling for Severe Gear 75W-110 SVTGT
AMSOIL Severe Gear® 75W-110

Seems odd that the front and rear would use different weight lubes. Is it because the ELD requires a friction modifier? Can I get away with using the same lube with a friction modifier in the front diff as well? Guess I'm just a big fan of uniformity.

What are you guys using in your diffs???

Thanks gents!

 

[Vash]

Yes, two different weights are required between the front and rear diff because the differentials are not the same except the gear ratio. There's a huge thread about recommended viscosity etc. http://www.fordraptorforum.com/f52/...n-modifier-31358/?highlight=Friction+modifier

 

[Drunktank]

Different fluids?!? Dont they know aint nobody got time for that!

So do you have to add a friction modifier to the Amsoil for the rear diff?

 

[KaiserM715]

Is it because the ELD requires a friction modifier? Can I get away with using the same lube with a friction modifier in the front diff as well?

No friction modifier required. Refer to these posts:
http://www.fordraptorforum.com/f52/...riction-modifier-31358/index3.html#post620863
http://www.fordraptorforum.com/f52/...riction-modifier-31358/index7.html#post647022

 

[MNWILKO]

How many miles would you guys recommend waiting before replacing the diff fluid?

 

[Wilson]

How many miles would you guys recommend waiting before replacing the diff fluid?

depends on if you get in the water or not.

 

[Jimbo]

just fill with you'll be ok

 

[Aramco Raptor]

Differential Oil??

Hi All,

Ok...going to install a Mag Hytec diff cover when I eventually get back home from this shit-hole and wondering what oil to use?

Been reading quite a few posts on the subject...any thoughts appreciated...

Royal Purple, Amsoil, Redline, Lucas etc etc...

Documentation, facts or personal experiences all welcomed.

 

[Yukon Joe]

Did you read thought the rear diff thread?

Yukon Joe