1990 F250 rear end
1990 F250 rear end
Still kicking!!
Joined: May 2003
Posts: 6,061
Likes: 6
From: Kalispell, Mt.
Welcome to FTE! I will be moving this to the Transmission, Differential, Axle and Transfer case forum where someone can give you explicit instructions on how to get the answer you need.
Thanks for using FTE as your source of information. Please check out ALL of our forums. FTE is huge and has a lot to offer and many forums to find or give info in. Also check out the forum guidelines and the READ FIRST notes. They'll help you along the way.
Thanks for using FTE as your source of information. Please check out ALL of our forums. FTE is huge and has a lot to offer and many forums to find or give info in. Also check out the forum guidelines and the READ FIRST notes. They'll help you along the way.
Postmaster
Joined: Dec 2002
Posts: 3,959
Likes: 9
From: USA
Yep, the door code will have the info. Code 35 is 4.10's if I remember correctly. Code 39 is 3.55. If your code is alpha-numeric as opposed to 2-digit, the alpha character indicates a limited slip differential. Check out the 'tech articles' section of this website, under 'decoders' for more info on axle codes, etc. You can also look on the ID tag attatched to one of the axle's diff cover bolts. The ratio will be stamped on it as well as the ring gear diameter and manufacturing code. An 'L' in between the first and 2nd digits of the ratio indicates a limited slip differential. The first digit may be hidden under the bolt.
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