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Speedometer error correction......


duffy

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Joined
Jan 12, 2020
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Vehicle Year
1989
Vehicle
Ford Bronco II
I have an 89' B2 with auto (A4LD), 4x4 (electric shift), 3.73 gears (according to the door tag) 205-75-15 tires, and a white speedo gear (17 tooth). My speedo reads high at all speeds. It reads 10 mph high at GPS indicated 60mph (reads 70mph). Internet cruising indicates that I need to get a higher tooth gear. Around a 3.5 tooth increase which should be a 20-21 tooth. Anyone have any input about which gear might be closest to accurate?
 


duffy

Member
Joined
Jan 12, 2020
Messages
60
Reaction score
16
Points
8
Vehicle Year
1989
Vehicle
Ford Bronco II
I found an older formula that I used back when I was working on a 77' F250......I got a 20 tooth (black) and installed it. Reads 1 mph high at 25 and 2 high at 60......good enough for me.
 

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