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axle ratios
Old 05-12-2009, 09:29 AM   #1
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When buying a used vehicle is there a way to verify the axle ratio without seeing the original paperwork for the truck?

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Old 05-12-2009, 10:11 AM   #2
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Perhaps some of the Ford and GM folks will step in, but on the Dodge (depending on vintage) this information is often found on a sticker inside the glovebox door or under the hood.

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Old 05-12-2009, 10:36 AM   #3
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My Ford pickups, Dodge motorhome and gm motorhomes had metal tags on differential covers with the ratio and an "L" if limited slip.

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Old 05-12-2009, 03:24 PM   #4
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Thanks!
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Old 05-12-2009, 06:38 PM   #5
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You can also get the axle code from the sticker on the drivers door jamb for Fords. Check with your dealer and ask for the axle per the two letter/digit code.

Chevy usually will have a sticker in the glove box with an axle code listed.

Ken
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Old 05-12-2009, 07:48 PM   #6
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Thanks, buying a used vehicle is the pits!! It was so much easier when the bought our (now totaled) truck new, and just gave the dealer a list of everything we wanted.
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Old 05-13-2009, 05:32 PM   #7
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My 99 dodge diesel had the 3.73 stamped right on the end bell of the differential. I haven't checked my 2008 to see if it still is there.
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Old 05-14-2009, 06:12 AM   #8
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If your looking at fords again,('99-'06ish) SRW, w/PSD, you dont have a choice. They are all 3.73

Sticker inside door jam, should spell it out as well as stamped on diff.
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Old 05-14-2009, 08:29 AM   #9
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What is SRW, w/PSD?
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Old 05-14-2009, 08:33 AM   #10
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SRW = single rear wheels
DRW = Dual rear wheels
PSD = Power Stroke Diesel...Ford
D/A = Duramay/Allison...Chevy

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Old 05-14-2009, 09:34 AM   #11
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Quote:
Originally Posted by clayvd View Post
What is SRW, w/PSD?
Sorry, I assumed that you being a former Ford owner that you would automatically know PSD, my bad!
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Old 05-14-2009, 10:03 AM   #12
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No problem
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Old 05-15-2009, 06:50 PM   #13
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For a quick N dirty method of determining rear axle ratio I use this: Tape a piece of ordinary string to the driveshaft. Chalk mark a rear wheel and the pavement exactly in line with the wheel mark. Jack up the wheel and turn it one revolution. Count the number of wraps(and partials of course) of string on the driveshaft. That is the rear axle ratio.
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Old 05-25-2009, 10:18 AM   #14
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Also with Dodge, if you take a vin number in to a dealer they should be able to print you a build sheet showing exactly what options and packages the truck has.

I would guess the other two might be able to do the same?

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