speedometer gear
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New User
Joined: Dec 2004
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From: otsego,MN
speedometer gear
I have a 77 f-150 trailer special that had 31 inch tires on it, now I am running P275 60r 15. the truck has a 460 c-6 with 3.25 gears. The motor, tranny and drivetrain are all original. My question is where can you get a new plastic speedometer cable gear to make the speedometer accurate?Any info would be great. Also did the trailer specials have 31's from the factory as the speedometer was correct with those tires?
New User
Joined: Jan 2008
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an L78 -15 (78% of 235 mm) or P235 R78-15 (78% of 235 mm) is almost the same as a 31.5" diameter.
Your tire height with the new tires is 60 % of 275 MM
or 165 mm or 6.5 " x 2
15" + 13" = 28" in diameter.
TCI - TECHNICAL INFORMATION: Speedometer Gears
Your tire height with the new tires is 60 % of 275 MM
or 165 mm or 6.5 " x 2
15" + 13" = 28" in diameter.
TCI - TECHNICAL INFORMATION: Speedometer Gears
Elder User
Joined: May 2007
Posts: 514
Likes: 0
From: Northern Colorado
an L78 -15 (78% of 235 mm) or P235 R78-15 (78% of 235 mm) is almost the same as a 31.5" diameter.
Your tire height with the new tires is 60 % of 275 MM
or 165 mm or 6.5 " x 2
15" + 13" = 28" in diameter.
TCI - TECHNICAL INFORMATION: Speedometer Gears
Your tire height with the new tires is 60 % of 275 MM
or 165 mm or 6.5 " x 2
15" + 13" = 28" in diameter.
TCI - TECHNICAL INFORMATION: Speedometer Gears
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