So my door tag says my axle number is a 35, does that means I have a 4.10 gears in 10.25 without limited slip? The numbers on the axle tag say
S 129 N
4.10 10 2 7C12

I'm just trying to figure out which axle I have thanks.

 

Hey greenwhite, welcome to fte. The door sticker should say either C9 for limited slip or 39 for unlimited slip. It is sterling 10.25

 

4.10 open differential Sterling 10.25 ring gear.

 

Open... so i take that as i have the one wheel peal?

 

LOL... Yes! I hear the frustration in your response!

 

dont matter because almost all of them are one wheelpeals by now! 164k and a fresh change of oil and friction modifier and its still a pig to get both wheels to hook, even in the snow!!!

 

Yes I'm not happy to hear my rear end is open. It kind of blows me away too cuz this truck seems to have the best of everything else. 97 F350 with Dana 60 7.3 auto. Who wouldn't have ordered a better rear end?! I just off this several months ago so it is my first winter with it and the open rear end doesn't cut it at all. What are my options? Detroit lockers?

 

Detroit truetrac ftw! Kinda pricey I think.

Man. I wonder what kind of hits we get on search engines with phrases like "tranny" and "open rear"?!?!

 

In my opinion, if you haul weight in the truck bed, a ton or more, a locker is nothing but a headache and may cost you more money when stuff breaks.

If you haul weight, a limited slip with clutches or a selectable locker like the ARB air locker that you can switch to open when you have a load on.

If you never haul weight in/on the truck, a locker is fine.

I had a locker in my IDI, with a dump bed on it.
I also live in the mountains.

Couple tons of rock in the bed pulling a steep hill, the truck went straight no matter where you turned the front wheels.
Need to turn, hit the clutch to unload the drive line and unlock the axle so it would turn.

On more than one occasion, I scheared off the bolts holding the axle flange to the rear hub.

I don't have quite as much traction when I plow snow, but when I load up a load of stone the Trac Lok with clutches works much better for me.

 

Eaton true trac is the best option if you don't want to spend tthe money on a selectable locker. All gears so no additive or clutches to wear out.

Here's some info on it

https://www.ford-trucks.com/forums/1...has-to-go.html