Rear differential?
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Junior User
Joined: May 2003
Posts: 68
Likes: 0
From: Dallas, Texas
Rear differential?
I have a '92 F150, 4.9L, M50D. How do I tell what type of rear differential is in my truck? Limited slip vs. whatever else they put in these trucks. I want to make sure I am running the right kind of rear diff lubricant. Thanks for any insight you can give me.
Posting Guru
Joined: Dec 2002
Posts: 1,297
Likes: 3
From: Billings MT
Rear differential?
You can do one of many things.
You can look up the code on the door jamb under "axle code" and post it here or look it up.
You can crawl under the truck, there should be a tag bolted to the diff. The bottom row(I think bottom row) should have something like 3 55 or 3L55. Usually the first number is hidden by the bolt. The L stands for limited slip.
You can jack up the rear end, one side and see if you can turn the tire easily, with the truck in gear. If you can turn it, it is an open diff.
You can take the back cover off the diff and there would be clutch packs and a whole bunch of stuff other than the spider gears, etc.
Personally, the first option would be my choice. You can also call a local dealer and ask for the parts department. They can tell you what the code stands for.
You can look up the code on the door jamb under "axle code" and post it here or look it up.
You can crawl under the truck, there should be a tag bolted to the diff. The bottom row(I think bottom row) should have something like 3 55 or 3L55. Usually the first number is hidden by the bolt. The L stands for limited slip.
You can jack up the rear end, one side and see if you can turn the tire easily, with the truck in gear. If you can turn it, it is an open diff.
You can take the back cover off the diff and there would be clutch packs and a whole bunch of stuff other than the spider gears, etc.
Personally, the first option would be my choice. You can also call a local dealer and ask for the parts department. They can tell you what the code stands for.
Posting Guru
Joined: Dec 2002
Posts: 1,297
Likes: 3
From: Billings MT
Rear differential?
https://www.ford-trucks.com/forums/s...52B%25252Bcode
A search revealed this. It is 3.05 gears and an open(non-limited slip) rearend.
80W90 gear oil should be fine for it without any additives.
A search revealed this. It is 3.05 gears and an open(non-limited slip) rearend.
80W90 gear oil should be fine for it without any additives.
Junior User
Joined: Jun 2003
Posts: 84
Likes: 0
Rear differential?
ok where can I find a code sheet showing what type rear i have. This is my first Ford and you guys have been so helpful its not funny. My axle code is a 17 and the tranny code is a U.
Thanks again for all your help!!!!
Aaron
95 F-150 Ext. Cab 4x4
Thanks again for all your help!!!!
Aaron
95 F-150 Ext. Cab 4x4
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Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Rear differential?
This link has those charts in the information section, but put "f150" in the Model field; not "f-150". Also, this page and this PDF direct from Ford.
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Senior User
Joined: Apr 2003
Posts: 208
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From: Cheyenne
Rear differential?
My Axle code on my 1987 F-150 is H5?????? I dont see any H5 code on any of these charts??? I have a picture of my tag on my website if you don't bielieve me. THe closest thing is H9? What do you guys think?
www.geocities.com/mazdaforpresident/engage.html
www.geocities.com/mazdaforpresident/engage.html
