what gear ratio do I have? - Ford Powerstroke Diesel Forum
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Old 03-10-2013, 03:49 PM
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what gear ratio do I have?

Tried a quick search but didn't find an answer. How do I find out what gears are in my axles? Is there somewhere I can decode the VIN or something?
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Old 03-10-2013, 03:58 PM
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Most have 3.73
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Old 03-10-2013, 04:09 PM
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An oasis report from a Ford dealer.
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Old 03-10-2013, 05:03 PM
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You can look on your door plate and get the axle code , pretty easy search from there
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Old 03-10-2013, 05:13 PM
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I think the diff cover bolts will have a sheetmetal tag stamped with the ratio.
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Old 03-10-2013, 05:16 PM
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Quote:
Originally Posted by factoryoutnet View Post
An oasis report from a Ford dealer.
Quote:
Originally Posted by scagle1 View Post
You can look on your door plate and get the axle code , pretty easy search from there
Quote:
Originally Posted by Mykol View Post
I think the diff cover bolts will have a sheetmetal tag stamped with the ratio.
with all three^^^.

You can also count drive shaft revs per tire rev... (With help)
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Old 03-10-2013, 06:16 PM
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Thanks for all the replies. I will crawl underneath and check when it stops raining
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Old 03-10-2013, 07:21 PM
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Easy... SRW or DRW? What tire size and what RPMs at 70 MPH? If you're around 2000 RPMs on stockish tire size at 70, you have 3.73s.
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Old 03-10-2013, 07:34 PM
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Originally Posted by Zaairman View Post
Easy... SRW or DRW? What tire size and what RPMs at 70 MPH? If you're around 2000 RPMs on stockish tire size at 70, you have 3.73s.
It's a single rear wheel, stock tire size, 265 iirc. 70mph without OD? 2000 rpms @ 70 sounds about right.
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Old 03-11-2013, 11:08 AM
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Tag on the inside drivers door frame looks like the one on the link -
http://i1086.photobucket.com/albums/.../IMG_8017.jpg-
look bottom center where it says axle and then do a search with that code and it will tell you. Or you can crawl under and look for the tag on the diff bolt but i believe you still have decipher
The following lists the gear ratios on rear axles.

31 - 3.73 non-limited slip, F-250/Excursion
32 - 4.10 non-limited slip, F-250
41 - 3.73 non-limited slip, F-350
61 - 3.73 non-limited slip, F-350
73 - 4.30 non-limited slip, F-450
75 - 5.38 non-limited slip, F-450
78 - 4.88 non-limited slip, F-450
81 - 3.73 non-limited slip, F-350
88 - 4.88 non-limited slip, F-350
95 - 5.38 non-limited slip, F-550
98 - 4.88 non-limited slip, F-550
C1 - 3.73 limited slip, F-250/Excursion
C2 - 4.10 limited slip, F-250/Excursion
C3 - 4.30 limited slip, F-250/Excursion
D1 - 3.73 limited slip, F-350
D2 - 4.10 limited slip, F-350
D3 - 4.30 limited slip, F-350
E2 - 4.10 limited slip, F-350
E3 - 4.30 limited slip, F-350
EW - 4.10 limited slip, F-350 (ambulance package)
F1 - 3.73 limited slip, F-350
F2 - 4.10 limited slip, F-350
F6 - 4.56 limited slip, F-350
G3 - 4.30 limited slip, F-450
G5 - 5.38 limited slip, F-450
G8 - 4.88 limited slip, F-450
GW - 4.88 non-limited slip, F-450 (wide frame)
K5 - 5.38 limited slip, F-550
K8 - 4.88 limited slip, F-550
KW - 4.88 non-limited slip, F-550 (wide frame)
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