Rear End
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Freshman User
Joined: Feb 2008
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Rear End
Hi guys , I want to know were do you look to find what type of rear end gearing that you have? I have a 1999 F350 4x4 cc longbed with a V10 and plan on putting Kumho 37x13 tires on it. My truck gets off the line pretty good but I just want to know before I go and put bigger tires on. Thanks guys.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
What is the 2 digit code lsited under AXLE on the door jamb label?
There is a code decipherererrrrerrrerrrrerererr (too many "er"s) up top in the Super Duty forum. It's in the FAQ.
FWIW, you have two choices 3.73 or 4.30. Plus, either can be open or limited slip.
In fact... (on edit) here's the codes.
41 — 3.73 non-limited slip, F-350 (single rear wheels)
D1 — 3.73 limited slip, F-350 (single rear wheels)
43 — 4.30 non-limited slip, F-350 (single rear wheels)
D3 — 4.30 limited slip, F-350 (single rear wheels)
There is a code decipherererrrrerrrerrrrerererr (too many "er"s) up top in the Super Duty forum. It's in the FAQ.
FWIW, you have two choices 3.73 or 4.30. Plus, either can be open or limited slip.
In fact... (on edit) here's the codes.
41 — 3.73 non-limited slip, F-350 (single rear wheels)
D1 — 3.73 limited slip, F-350 (single rear wheels)
43 — 4.30 non-limited slip, F-350 (single rear wheels)
D3 — 4.30 limited slip, F-350 (single rear wheels)
Last edited by Monsta; Nov 30, 2008 at 10:26 PM. Reason: Added codes
Elder User
Joined: Jan 2007
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I'm currently running this set-up. LSD 4.30 37x14.50x16.5 (Super Swamper Tires) It also has a 6 inch lift. I get about 9-10 mpg, at 65mph my tachometer reads 2050. I take it easy on the go-pedal for more mpg if you know what i mean. To answer your question, yes it will be up to task. However, a lot of owners prefer the 4.56. I should have gotten the 4.56 but the 4.30's seem to pull fine for my needs. BTW, are you planning a lift for those 37" tires. I have ran 35" in tires stock form with minor rubbing on the fender walls.
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Yes V10 Cougar, I plan on getting a 6.5 Pro Comp lift with 37x14-50 r20 in January. I myself drive like an old lady at times for better mpg. Do you have any rubbing with those tires with a 6 inch lift?
Elder User
Joined: Jan 2007
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When you get a chance? Post some pics of the lift with your new tires.
Good Luck!!!
BTW- WELCOME TO FTE!!!!!!!!!!!
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