Correct speedo gear
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Junior User
Joined: Jan 2005
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From: Central Nebraska
Correct speedo gear
Was wondering if anyone had an idea what speedo gear I need.
I have 33in tires with 4.10 gears. Tranny is a E40D. If someone has a website they could post for this topic it would be appreciated
Doug
Truck is a 91 f 150 w/ 351 ext cab
I have 33in tires with 4.10 gears. Tranny is a E40D. If someone has a website they could post for this topic it would be appreciated
Doug
Truck is a 91 f 150 w/ 351 ext cab
Posting Guru
Joined: Jun 2004
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From: Central NY
no gear.... your speedometer is programmable.
Theres an aricle in the articles/specs above (in the bar that has HOME, FORUMS, GALLERIES...) that will tell you all you need. Post back if you can't find it.
Theres an aricle in the articles/specs above (in the bar that has HOME, FORUMS, GALLERIES...) that will tell you all you need. Post back if you can't find it.
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what about if you have did a gear change, how would you calibrate it then, cuz i am running 4.56s with 33's and an e40d. I bought a superlift calibration box for mine, but if you can do it through the speedo i would like to know
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Joined: Feb 2001
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From: brimfield township,OH
Just do a search for PSOM.The gears don't matter the tires do.There is a wire under the glove compartment that has to be grounded and then you use the odometer button to change it,I just don't remember how.I think the number for 33's is 8.25.You'll have to make sure first since it can only be changed 6 times.I think the bronco forum could help.
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From: Louisiana
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Junior User
Joined: Jan 2005
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From: Central Nebraska
the write up is for a 92-96 with the digital odometer. Mine is a 91 with the rolling odometer? How do u cal the speedo. or does it have a speedo gear?
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From: Concord, NC
For the 91 you'll have to change the speedometer driven gear on the transmission end of the speedo cable.
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From: Easton,Ks
Originally Posted by Douglas Walker
anyone know the # of tooth gear for 33in tires and 4.10's with a e4od
Doug
Doug
I just looked up a 1991 with a 4.10 and in the chart they do not list a E40D but I think the E4OD is just a C6 with electronics added along with some updated parts.
That said, the largest they go with a 4.10 with a C6 is a tire size of 9.50x16.5E.
So if you can find a stock tire size outside diameter that is the same as your 33in then I can give you a part number.
Last edited by subford; Dec 19, 2006 at 09:48 AM.
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From: Easton,Ks
Originally Posted by Douglas Walker
the tire on it now is a 33/12.50-15
stock were 235/75-15. which is i believe a 29in tire
what else were u looking for
stock were 235/75-15. which is i believe a 29in tire
what else were u looking for
Also they do not list metric tire sizes for a truck with a 4.10 rear end.
EDIT:
After looking at the charts again Ford does not list a 15" tire with a 4.10 rear end after 1990 in the charts. They are all 16 or 16.5" tires.
Last edited by subford; Dec 19, 2006 at 02:35 PM.
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From: Easton,Ks
As a wild guess I would start with a 20 tooth Orange gear, C8SZ-17271-B.
Do you know what you have in there now and is it fast or slow.
The Orange one is for a 4.10, 33 inch Diameter and a drive gear of 8 teeth.
You may have to pull off the tail shaft and count the drive gear teeth or step up or down from the Orange gear.
Do you know what you have in there now and is it fast or slow.
The Orange one is for a 4.10, 33 inch Diameter and a drive gear of 8 teeth.
You may have to pull off the tail shaft and count the drive gear teeth or step up or down from the Orange gear.