I have a truck that I was under the impression has a Corporate 9.25" rear diff (according to the tag in the glove box), however, as I work on this thing it seems that it might be a Dana 9.25 diff. I know the was in an accident (not reported to me when I bought it, and can't find info on one) because of other issues I found (different paint on the box, the box was removed and put back on crushing a bunch of , it wasn't set properly ect.). I believe that when this happened, they might have replaced the rear also. I am trying to get parts for my rear axle and am having problems doing so. It appears that the packs for the limited slip are different from both but when I did not know anything about the truck (or even that there was a 9.25 corporate) I bought the packs for the Dana, they fit in there real nice (maybe a little tight but good). On to my question, how do I tell if I have the Corporate or the Dana rear axle?

Thank you in advance for any info you might be able to share!

 

Look at the rear cover. Compare it to the pics here.

 

No such thing as a Dana 9.25, the 9.25 (corporate or otherwise) is basically the same axle going back to 1972. Of course you didn't include any information whatsoever (or pics), like year, model (1500? 2500?). I'm guessing you have a 2500, as 3.73 was not an offered ratio for the 1500. If this is the case, you wouldn't have a 9.25 anyway.

 

This is getting even more confusing, it is a 2004 1500. The slip in the glovebox states a 9.25 Corporate 3.73. I have it torn apart and did take some photos, I cant find any more information on it though. It looks like it is a 3.92 diff according to the teeth. Not sure how to take it.


12 teeth
12 bolt
47 teeth

 

Looks a lot like a 9.25 to me..... and likely 3.92 gears.

 

Thats what I was getting from the teeth on the ring and pinion along with the ring gear being 9.25 also. I dont quite understand why the glove box stated 9.25 corporate with a 3.73. I do know that the clutchpacks will fit from a Dana 44 to this one, however it took the corporate pinion and carier bearings.

Thank you guys for the info!

 

Probably someone changed the gears somewhere in the past.

 

Never ever seen a 02+ 1500 with 3.73's, only 3.55's and 3.92's. That however is definitely the "corporate" (I hate that term for some reason lol) 9.25 rear. You can either run your VIN to find out what was original equipment as built or post it here and one of us can do it. Just a curiosity question, has your dash and/or glovebox been replaced? Does the VIN on the sticker in the glovebox match your actual VIN?

 

The VIN matched, dealer stated the corporate 9.25 with 3.92. Matched VIM label in the glovebox, stated 9.25 Corporate 3.73. I don't understand LOL. I am going off of what I found and what the dealer told me and disregarding the slip in the glovebox. I find it interesting that the Dana 44 clutch packs fit in it though. Thank you again for the assistance!

 

Likely someone goofed, and its just a misprint.

I would measure the distance between the spring perches, and then check 1 ton trucks to see how close they are...... might be able to grab a D70, or 80 that is already set up for duals.