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3.73 or 3.55's

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Old Feb 14, 2006 | 10:34 PM
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Question 3.73 or 3.55's

Folks!
A slight delima here. When I bought my truck the sticker said it had a 3.73 differential, and yes I paid extra for it. Yesterday when I installed my new Edge Evolution, it said I had 3.55's. Other than taking it to a dealer and explaining what I have just explained to you all. (not a good Idea) How can I find out exactly what differential I have in my truck. I have an 04 F-150 STX 4x4 scab. Any thoughts or ideas would be most helpful.
 
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Old Feb 14, 2006 | 11:42 PM
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That's weird, I plugged mine in and went to a defalt of 3.73 gears, when I have 3.55. I dont know why that is. Anyway, check out this thread that I started a few weeks ago because I was unsure of my ratio- "Whats my gear ratio"
https://www.ford-trucks.com/forums/s...d.php?t=458958
 
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Old Feb 15, 2006 | 07:49 AM
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I would take what your tuner says with a grain of salt. It's best just to adjust it to where it needs to be. The tuner doesnt always pull the info correctly.
 
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Old Feb 15, 2006 | 11:16 AM
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Check the tag affixed to the rear differential. It should have a code on it, telling you what the gearing is. Post the code here if you cant decipher it.
 
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Old Feb 15, 2006 | 03:42 PM
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Question Differential Tag

The one I was looking at that made most sinse said "3L73 88 3K02". And the sticker on the door frame said B6 under axle. One would think that would translate to 3.73/limited slip???
 
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Old Feb 15, 2006 | 03:45 PM
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You are correct.
 
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Old Mar 7, 2006 | 01:55 PM
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Axle tag says "55 88 4f14" door tag says "19" so what do I have.
 
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Old Mar 7, 2006 | 03:07 PM
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"55 88"

Dont know for sure, but it looks like 8.8", 3.55 gears.
 
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Old Mar 7, 2006 | 08:16 PM
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I f you have the FX$ you should have the 3.73 LS. That is part of the package. Hope this helps out.
 
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Old Mar 8, 2006 | 06:07 PM
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Heres my tag

Can someone tell me what ratio I have.
55 975 5B10

Its an 05 150 XLT w/ no tow package.
Thanks all.
 
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Old Mar 8, 2006 | 08:15 PM
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Originally Posted by PAX_SMIB
Can someone tell me what ratio I have.
55 975 5B10

Its an 05 150 XLT w/ no tow package.
Thanks all.
By the numbers you provided, you should have 3.55 gear ratio, and 9.75" ring/diff. If the 2 digit axle code on your door jam sticker has a letter and a number (ex. B6)-then it is limited slip, if it is 2 numbers (ex. 19)-then it is not limited slip. Hope this helps.
 
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Old Mar 8, 2006 | 10:05 PM
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F-150 Door Sticker Axle Code Decoder Info: (sticker located inside driver's side door jam)

18 = 3.08 non-limited slip
19 = 3.55 non-limited slip
H9 = 3.55 limited slip
B6 = 3.73 limited slip
 
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Old Mar 9, 2006 | 12:45 AM
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Well then I got a good one for ya! My Axle code on the door sticker says 26. It is an 04 SCREW 4x4 Lariat. What axle do I have? I would imagine it would be a 3.73 LS because it is part of the package but who knows?
 
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Old Mar 9, 2006 | 05:47 AM
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So with a 3.55 Non LS axle, is it ok to tow? I wont be hauling very often but I will be draging a tandem axle UHaul across coutry with 2-4K pounds of stuff next spring (1 shot). and ocassionaly a camping trailor but nothing over 5000 pounds. How much trouble to have the rear end changed to 3.73 if I need to.?
 
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Old Mar 9, 2006 | 08:54 AM
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Just a question, but what size axles do these trucks have, 8.8 or 9.75? Looking at two of the replies, one truck has an 8.8 rear end and another has a 9.75 rear end? Does the axle actually vary among the truck lines (XLT, FX4, Lariat)? Or does the HD package give you a larger axle?
 
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