Differential fluid on 2wd

[igneous]

I need to do a diff. change (2wd) this weekend. Do you guys recommend sticking with Ford spec'd stuff. Is it full synthetic or should I upgrade to one that is? I have the HD tow package.
Stupid stealership wants to charge me $200 >> Ripoff!

 

[mindgame]

I need to do a diff. change (2wd) this weekend. Do you guys recommend sticking with Ford spec'd stuff. Is it full synthetic or should I upgrade to one that is? I have the HD tow package.
Stupid stealership wants to charge me $200 >> Ripoff!

Stick with the proper spec.. I'm bias toward synthetic (RP)..
As long as you change it, when required.. All will be good.

 

[igneous]

Thank mindgame
Just checked manual and reads Ford synthetic 75w-140, so I'm sure any synthetic that weight would work.

 

[JUST4FUN]

Don't forget if it's a limited slip to add the modifier additive

 

[mindgame]

Thank mindgame
Just checked manual and reads Ford synthetic 75w-140, so I'm sure any synthetic that weight would work.

yup...

 

[igneous]

Thanks gents!

 

[igneous]

Another question...my door jamb doesn't have the "L" in the axle code for Limited slip, so I assume no friction modifier needed. I have the RSC (roll stability control), so limited slip probably does not work with this option, correct? I'll check that with the dealership if I go with Ford fluid. What are good 75W-140 synthetic recommendations I can get at auto zone/o'reillys.

 

[Canadian Expy]

I like Royal Purple for fluids, but thats just me. Some think its to $$$ but I think rebuilding motors/trans/rear ends is to $$$

 

[igneous]

I used Valvoline synthetic 75w-140. I has the LS additives, but don't really think it matters in non LSD. Funny thing, the manual states it holds 4.5 pints, but could only get 2 bottles (4 pints) in it before it started leaking. Got to looking and the drain plug is not low enough to drain everything, so it holds half a pint or so in the very bottom.