tire size speedo problem
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tire size speedo problem
on a bias tire what size is a h78-15 the h is the size and the 78 means its 78%of the width but i dont know ether iv been told this is the same as a 235/75/15 but my speedo still is 10mph off
iv put the the right speedo gears as of the ford parts book and the gears are original 2.75 (iv checked the teeth) iv also changed the speedo 3 times to twise to 85mph and now a 100mph speedo there both the same 10 off. the needel dosnt bounce so the cable is good i thought the speedo gears where color coded but i have 3 drive gears (green ,brown, and yellow) and they all have 7 teeth. im using a 18 tooth driven gear. thats what the ford book said. these are green drive and light yellow driven thanks
el61hydraglide_1999(No Email Addresses In Posts!)
iv put the the right speedo gears as of the ford parts book and the gears are original 2.75 (iv checked the teeth) iv also changed the speedo 3 times to twise to 85mph and now a 100mph speedo there both the same 10 off. the needel dosnt bounce so the cable is good i thought the speedo gears where color coded but i have 3 drive gears (green ,brown, and yellow) and they all have 7 teeth. im using a 18 tooth driven gear. thats what the ford book said. these are green drive and light yellow driven thanks
el61hydraglide_1999(No Email Addresses In Posts!)
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tire size speedo problem
[updated:LAST EDITED ON 02-Dec-01 AT 01:38 AM (EST)]L=235
H=225
G=215
F=205
Look here for info:
www.dunloptire.com/tt101_sizing.html
Dennis
I'm the guy with all of the GIFS and I'm not afraid of using them !
78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles
H=225
G=215
F=205
Look here for info:
www.dunloptire.com/tt101_sizing.html
Dennis
I'm the guy with all of the GIFS and I'm not afraid of using them !
78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles
Senior User
Joined: Nov 2001
Posts: 144
Likes: 1
From: Savannah US
tire size speedo problem
they make speedo gears to adjust that
"Don't Laugh At This Truck Mister, Your Daughter Might Be In Here!!"
'78 F250 4x4/302/NP435/NP205
lifted/"35 mudders
'78 F100 2wd/360/C-6/"9 inch
4bbl int+carb
"Don't Laugh At This Truck Mister, Your Daughter Might Be In Here!!"
'78 F250 4x4/302/NP435/NP205
lifted/"35 mudders
'78 F100 2wd/360/C-6/"9 inch
4bbl int+carb
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
tire size speedo problem
Jesse, You need to change the gear on the end of the speedo cable that goes into the tranny. There is a clip that holds the gear onto the cable and can be changed out and it will change your speedo reading.
A couple of questions, if you hold the gear out in front of you horozontally do the gears from front to back go to the right or to the left? How many teeth are on the gear that worked correctly for the 2.75 gear.
I have a couple spare size gears right hand twist, I know one is a 17T but will have to count the other. I need a gear for a 2.75 and would trade if I have one that you could use.
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John
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A couple of questions, if you hold the gear out in front of you horozontally do the gears from front to back go to the right or to the left? How many teeth are on the gear that worked correctly for the 2.75 gear.
I have a couple spare size gears right hand twist, I know one is a 17T but will have to count the other. I need a gear for a 2.75 and would trade if I have one that you could use.
http://www.clubfte.com/users/jowilker/USFlag.gif
John
jowilker email me
[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
