Speedo gear question

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Aug 15, 2003 | 10:55 AM

90EBBronco

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Joined: Feb 2002

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From: Central Iowa

Speedo gear question

I have done a thorough search of this forum and haven't found a direct answer. I am running 35x12.5x15 tires with stock 3.55 gears. I would like to regear my speedo so my E4OD will shift correctly and my mileage will be accurate. There are many questions in this forum about this topic but no real answers to the question. What speedo gear do I need to get to correct my speedo? I called ford and they don't have listings for oversize tires. Thanks in advance.

KJ

Aug 15, 2003 | 01:17 PM

Trucky18

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Joined: May 2003

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From: Ohia

Speedo gear question

I know super-lift sells a computer thingy that corrects the tire size, it has a little switch on it an you can change your tire size as much as you want.

Aug 15, 2003 | 01:42 PM

AlM

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Joined: Mar 2000

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Speedo gear question

yo,
TCI has the color codes and formula for finding the correct gear here:

http://www.tciauto.com/tech_info/speedo_gears.htm

you'll need to determine your tire diameter and # of Drive Teeth

and also Chris has this:
http://www3.bc.sympatico.ca/cbradley...earchange.html
...
or say ... and do this:
http://www.speedometershop.com/ratio.html#GEAR

Keith has pics on the gear change here:
http://www.superford.org/registry/ve...=13464#content

Last edited by AlM; Aug 15, 2003 at 01:45 PM.

Aug 15, 2003 | 02:39 PM

90EBBronco

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Joined: Feb 2002

Posts: 256

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From: Central Iowa

Speedo gear question

I just want to know the number of teeth that someone has used to correct their speedo with 35" tires and 3.55 gears. Just give me a number, I don't want to do any math, I want to be lazy. Please.

KJ

Aug 15, 2003 | 04:54 PM

AlM

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Speedo gear question

ok kj

Aug 15, 2003 | 10:45 PM

DW2455

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From: Independence, MO

Speedo gear question

Quote:

Originally posted by 90EBBronco
Just give me a number, I don't want to do any math, I want to be lazy. Please.

KJ

HEY AT LEAST HE'S HONEST!! THAT'S MORE THAN SOME OF US WILL ADMIT TO!!:-staun

Aug 18, 2003 | 07:55 AM

90EBBronco

Thread Starter

Senior User

Joined: Feb 2002

Posts: 256

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From: Central Iowa

Speedo gear question

Please, someone just let me know what gear I need. I am not a fan of Math and would probably screw something up in my head were I to try to use the math portion of it. Do you want to see me wearing a bib and a helmet, riding on a small yellow bus? Wait, don't answer that question. Once again, 35" tires with stock 3.55 gears, what speedo gear do I need to recalibrate speedo?

KJ

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Aug 24, 2003 | 01:41 PM

AlM

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Joined: Mar 2000

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Speedo gear question

yo DW, no problemo..but he still needs to get the "actual" tire diameter (although it is 35..who knows the actual diameter since the actual varies among tire mfgrs)...and at the psi he needs to run at; can't do it from here for him although I'd like to help.
Also, he'll need to confirm the # of Drive Teeth; can't guess from here on this either; esp not knowing if a prev owner has changed the tranny, etc.