I know nothing about this, other than it was in the back of a 1988 pickup that I'm unsure what is inside so far. I haven't had a lot of time to get things looked over, so don't want to imply anything I don't know for certain. This looks similar to a '55 Chevy Series II axle I swapped the ring/pinon on. AFAIK, you need both and most vendors only offered one lower set. I don't know what Ford offerred in '88 or what this diff is for. EDIT: I have the diff with me, and can wire wheel a couple more areas, there's a couple things I can't read.


41 tooth 6.5 or 6.75 ID ring gear

Stamped 429. Does this mean this is meant to be 4.29 when paired with the proper pinion?

Also stamped 69, does this mean 1969?

 

All those numbers are on the carrier. That would have nothing to do with the pinion since the same carrier and be used with many different gear ratios. Is there anything stamped on the ring gear?

 

The only thing I see on the carrier is this:



I think this is 24 B2 Y

Unfortunately, I think I would need to remove the ring from the carrier to see what's on the back. Most likely, it's stamped on the back.

Does that stamp make sense to you?

 

You know, I think this is too small for the 10.25 Sterling...the OD/ID of the ring gear is 9.5/6.5~

Shouldn't the ring gear be 10.25" for the Sterling? Could this be for the transfer case? Or possibly just an extra carrier that someone picked up...but that seems unlikely. The faces on the ring gear look pretty shiny. Hard to see in the pics.

 

Uh oh...looks like a Dana 50 has a 9" ring gear with 41 teeth!

EDIT: Nope, this one is definitely 9.5"

However, it seems too coincidental that this is a 41 tooth, unless it's for a Dana 44 or a 60

 

No. The numbers and letters would be on the side of the ring gear.

 

Look for numbers on the edge.

 

By the direction the teeth are cut, I would wager that is a front diff gear.

 

Ok, I got it. Was pretty rusty but using a small brass wire brush on a cordless drill. This is what I have, it is in fact a Dana.

Also, before I forget, the front hubs do in fact lock in, so it must have a carrier inside. When moved to Free, they spin, but when they's locked they don't spin. I think that's a good sign. And it does in fact say 41 10 which is the 4.10 gear ratio, but from a March 02, 1989 build date? Do you know if the D 620 signifies a Dana 60?

 

@Mudsport96 I found it online, it's a Dana 60 (620108)

https://transtechca.com/product/700020-2/

I hope the seller didn't know something about the front diff that I don't. The fact that it does lock is a good sign, so far one of the few.

I also found this, which does coincide with the 9.5" I thought it was, this says it's 9.75". Up in this thread I thought it was 9.5 or 9.75.

"You cannot fit a Dana 60 carrier and/or Dana 60 gears into a Dana 50. The Dana 50 has a 9" ring gear, and the Dana 60 has a 9.75" ring gear."

 

Not sure about those markings.
At the age of these trucks, anything is possible. Perhaps the last owner swapped in the full float axle and it did not match the 4.10 that the front was. So the front was regeared to match the rear. Or Perhaps a bearing failed and the carrier was replaced. To many year and to many variables possible to guess.
Take my own truck as an example.
Readend is from an 89 2wd f150.
Transmission is from a late 80s early 90s 4x4 LD 250 like you have.
Gas tank and fuel pump is out of a 94 long bed.
And the ignition coil is out of a 2.3 mustang lol.

 

D60

Also whoever set the 10char min post size is a ****.

 

I'm betting that diff was just trash from some other project and got tossed in the truck bed. The gear is pretty useless without the matched pinion.

 

Agreed
That person needs kicked in their D60.

 

Agreed, but it could be useful if I was to find a D60 axle, as this would match with the rear axle gears. Seems the data says it was 9.75" but it looks like 9.5" to me. I do hope it was just extra parts. I know I have some missing parts, other than the diffs, and don't really need any more.

They need a swift kick in their Sterling! LOL