Rear Diff Oil

[YoungBuck]

I have to replace the gasket in my rear diff.

What gear oil to use? I know I have to add friction modifier to it too.

ThaNks,

Jason

[G-Spot]

You need 75w90 gear oil and a bottle of friction modifier. You can get both at Partsource or your local Ford dealership. Or if you have it availableto you, my favorite is to use Redline 75w90NS It is a synthetic from Redline oil and doesnt require you to add friction modifier. AWESOME STUFF

[Chris99GT]

use synthetic, mobel 1 is also really good.

[YoungBuck]

Thanks,

About 2 bottles should fill it correct?

[G-Spot]

Thanks,

About 2 bottles should fill it correct?

Yesh

[YoungBuck]

I picked it all up today.

Does Friction Modifier ever stink like ass!!!:pukeon:

[jonnyk]

Yep. Tip: never pop the dif cover when you're under it. Imagine getting that shit out of your hair. Live and learn.

[Chris99GT]

haha, murph got covered when we did his. he stank

[Matthew]

If you leave the friction modifier out, the posi will be tighter. Sorry if this advice is a little late.

-Matthew

[YoungBuck]

Nope not yet, I have all the stuff to do it tomorrow.

[tear u a new 1]

If you leave the friction modifier out, the posi will be tighter. Sorry if this advice is a little late.

-Matthewsweet . im goiog to be putting 4:10s in mine this winter in my new garage. well ok , not me but a qualified guy. lmao

[terminal velocity]

will that wear out the diff if you leave that out? ???

[modded46]

How do you know when you need to replace the gasket?? Just basically leaking or what? Mine leaks a little but its not like a constant drip or anything.

[YoungBuck]

Well, the old cover was all bent up on the bottom from a bad jack I used, and it was leaking pretty bad.

I put on a Mac rear girdle as well, it was a bit of a pain to get in there with the sway bar on. Just had to have a buddy lift up on the back bumper to take some slack off the suspension and it went in good.

It looks pretty good now too. I think I am going to have the car undercoated for before winter hits.

[1980cobra]

will that wear out the diff if you leave that out? ???
yeah i would like to know too as i'm doing my gears and wonder if it will "bite better" without the modifier or should i put it in?

[Matthew]

I don't think it wears the diff out any faster, but maybe the clutches won't last as long. It will definitely bite better without it. Also, if you are rebuilding the diff, you can change the order of the clutches and insert an extra steel (I'm pretty sure it's an extra steel) to make it tighter. You should be able to find some comprehensive instructions on this modification by doing a web search or a search of Stangnet or the Corral.

-Matthew

[Murph]

and if you do get your hair covered in it, dish soap works really good getting it out.

[mwdguy]

and if you do get your Mullet covered in it, dish soap works really good getting it out.

Fixed it for ya Murph

[5.0 Fugitive]

I don't think it wears the diff out any faster, but maybe the clutches won't last as long. It will definitely bite better without it. Also, if you are rebuilding the diff, you can change the order of the clutches and insert an extra steel (I'm pretty sure it's an extra steel) to make it tighter. You should be able to find some comprehensive instructions on this modification by doing a web search or a search of Stangnet or the Corral.

-Matthew

The clutch pack modification is to pick the 2 best friction plates from the existing ones. Then with the new rebuild kit, you put the plates back in Friction-Steel-Friction-Steel and so on. I did this when I rebuilt my diff 2 years ago. The trac-loc definately feels better than it in other Ford's I have driven. Also if you run a good quality synthetic gear oil you don't need the friction moddifier.

[1980cobra]

do any of you guys know where i could get the shims for the carrier and the pinion in edmonton? possibly a kit since i don't know the exact size of shims i need just that i need some

[MadMatt]

I got mine at Pro Trac Gear, best price I could find at the time. I also had no problems returning them when I did not need them, I also got the bearings and seals from them too. The packs of shims came with a bunch of various sizes.

[1980cobra]

:2up: awesome thanks man