ok, i just looked up the code on my sterling 10.25 rearend. here's how it came up:

V120C: '86-'92 ford f250 and f350 3.55 gear ratio Locking diff

couple questions about the locking diff part: This is just another word for limited slip right? or is it some kind of other mechanism in there.

also, im putting this in a truck built for the mud, if i were to put gearing above 4.56 in this axle, i would have to take the "locking" part of it out anyway right?

and, i was looking to see if eaton e-lockers were made for these axles and cant find them. Are they really not made for them?

 

Eaton does make an e-locker for the Sterling 10.25 and the 10.5" axles. I believe that it is part # EAT19694.

As for your factory carrier, it will not be a locking diff, it is only a limited slip, and unfortunately not a very tight one.

There are no carrier breaks for this particular axle, so any carrier will work with any available ratio.

Are you sure for a dedicated mud truck that an e-locker is the way to go?

Why not a full carrier Detroit?

 

thats good to know that theres no carrier break on these. i only asked because i think in the dana 60's and maybe the 70's you have to use a different carrier for 4.56 and above.

i only said the e-locker because it seemed a good choice (its electric unlike the air locker) but im still learning about all the different traction devices

the detroit carrier that you're talking about is the automatic locker right? what are the advantages of having the detroit in the mud?

also, i was reading an article on the 10.25 and it said that running 38 inch or bigger tires tend to cause excess spider-gear wear and possible case failure on these axles. they say a good fix is to go to the 3-spider-gear-setup. does this still apply to me if i were to put a locker of some sort?

 

Stock LS units and or stock carriers are prone to breakage in the Sterling axles, but aftermarket carriers seem to have more material and strength.

The full carrier Detroit is th strongest, and most reliable.

 

The detroit locker is the best part-time locker on the market in most people's opinion. For an offroad truck you can't really go wrong with one.