Help identifying rear differential
New User
Joined: Mar 2014
Posts: 7
Likes: 0
From: Molalla, OR
It should be a Ford 9 inch, a Ford 8.8, or possible a Dana 60-2. I don't know if they put a Dana 60-2 under a half ton in the 80's. I know they did in the 60's.
The 9 inch looks like this...
The 8.8 looks like this..,.
The Dana 60 looks like this...
If there are other options, or God forbid I'm wrong, I'm sure someone will be along shortly to point that out.
The 9 inch looks like this...
The 8.8 looks like this..,.
The Dana 60 looks like this...
If there are other options, or God forbid I'm wrong, I'm sure someone will be along shortly to point that out.
Postmaster
Joined: Nov 2009
Posts: 4,575
Likes: 5
From: Broken Arrow , OK
The front is a D44 TTB. You need to figure out if they are limited slip or not because the LS diffs take a friction modifier. Without it the clutches will burn up and frag the entire rear end.
Moderator
Joined: Jan 2001
Posts: 57,012
Likes: 2,750
From: Virginia
Never heard that and never had it happen. Most of these limited slips by now are wore out anyway and don't do much.
Postmaster
Joined: Nov 2009
Posts: 4,575
Likes: 5
From: Broken Arrow , OK
It happened to the rear end in my Dodge 1/2 ton. The clutches and steels went to pieces, then through the R&P as well as the pinions.Just the parts were over $500 to rebuild it. If my buddy wasn't a well seasoned rear end guy the bill would have been close to $1200.
This is from experience not just something I heard on the net.
This is from experience not just something I heard on the net.
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Postmaster
Joined: Nov 2009
Posts: 4,575
Likes: 5
From: Broken Arrow , OK
Just running straight gear oil and not the stuff specified for LS or adding the friction modifier is bad news.
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Junior User
Joined: Oct 2013
Posts: 62
Likes: 0
Here are the numbers that I can read off the tag on the rear diff.
Top row. BDR And then AN21
Bottom row. 5588 S 808A
I think some of the numbers/letters are missing from the top row but that is all that is legible.
Top row. BDR And then AN21
Bottom row. 5588 S 808A
I think some of the numbers/letters are missing from the top row but that is all that is legible.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
Bottom row, there's a "3" missing from the beginning, but it's a 3.55 ratio 8.8.
If you look closely, near the bolt head, you'll see the missing 3. That's not important. There *could* be an "L" between the 3 and 55. That would indicate a LS axle. Just a blank space (it's really a ".") would indicate a non-LS axle.
If you look closely, near the bolt head, you'll see the missing 3. That's not important. There *could* be an "L" between the 3 and 55. That would indicate a LS axle. Just a blank space (it's really a ".") would indicate a non-LS axle.
Posting Guru
Joined: Jan 2014
Posts: 1,083
Likes: 0
From: Where the Army sends me
Yeah, time to crawl back down there. The LS is more expensive to fix, so make sure you are giving it the right gear oil.
