Help with differential Identification

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Jan 6, 2008 | 03:38 PM

S.D.F250

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Help with differential Identification

Alright ladies and gents. I need some help with the identification of my front and rear diffs. I am going to try and attach some photo bucket links. I hope this works. The reason I want to know what I have is so that I can lower my gears and add lockers. Any all info is appreciated.

http://i5.photobucket.com/albums/y16...P/100_3834.jpg
http://i5.photobucket.com/albums/y16...P/100_3826.jpg
http://i5.photobucket.com/albums/y16...P/100_3829.jpg
http://i5.photobucket.com/albums/y16...P/100_3828.jpg
http://i5.photobucket.com/albums/y16...P/100_3827.jpg
http://i5.photobucket.com/albums/y16...P/100_3825.jpg

Jan 6, 2008 | 03:53 PM

boxcar1974

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From: Massachusetts

What you need to do is look in the door jamb area and look for a factory tag with all the info on it. There is a spot that says axel with a code. Then match it up here:

Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250
41 — 3.73 non-limited slip, F-350 (single rear wheels)
D1 — 3.73 limited slip, F-350 (single rear wheels)
42 — 4.10 non-limited slip, F-350 (single rear wheels)
D2 — 4.10 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)
46 — 4.56 non-limited slip, F-350 (single rear wheels)
D6 — 4.56 limited slip, F-350 (single rear wheels)

Jan 6, 2008 | 04:36 PM

S.D.F250

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Mine says it's a 31 (— 3.73 non-limited slip, F-250/Excursion) Wich takes care of what gears I have, but how do I find out what kind of Axle I have?

Jan 6, 2008 | 04:49 PM

redford

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Joined: Sep 2000

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From: Stephensville WI

You have a Visteon (or Sterling) 10.5 inch differential in the rear and a DANA 50 in the front.

Jan 6, 2008 | 05:09 PM

Citypol86

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From: Lower Hudson Valley, N.Y.

I have an '05 F250 SD Crew Cab 5.4 with the axle code of "37". It's clearly a seven and not a one also. The sticker's nice and clean. Any ideas?

Later...
Brewster...

Jan 6, 2008 | 05:14 PM

antony25

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From: Omaha, NE

the tag on the rear axle will show ring gear size and axle ratio. example- 3L73 1025 for a 10.25" with 373 gears and a posi

Jan 6, 2008 | 06:14 PM

boxcar1974

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Joined: Dec 2003

Posts: 3,130

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From: Massachusetts

Quote:

Originally Posted by Citypol86

I have an '05 F250 SD Crew Cab 5.4 with the axle code of "37". It's clearly a seven and not a one also. The sticker's nice and clean. Any ideas?

Later...
Brewster...

What I posted was for 99-04 trucks.

Not sure about the 05+ trucks. But you alsways could crawl underneath and see. The sticker should still be there. Mine is on my 03' with 90K miles on it.