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Calibrating Speedometer - 1990 Ford Bronco II


idriveafordranger94

Well-Known Member
Joined
Mar 5, 2008
Messages
271
Age
36
City
Suffield, Ohio
Vehicle Year
2009
Engine
4.0 V6
Transmission
Manual
Tire Size
LT265/75/R16
I was using my GPS today to get somewhere and noticed that my speedometer is about 4-5 mph off at 45mph and 6-7 off at 65. The tires that are on my Bronco are 30x9.50 R15; They aren't stock. How do I go about recalibrating my speedometer? I have a perfect driving record and want to keep it that wa! Thanks!
 
do the math, and get a new speedo gear to compensate. or just automaticly compensate like i do.

i have stock tires and its 5 mph off at all times
 

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