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speedometer gear???

4006 Views 7 Replies 6 Participants Last post by  Ram, 
jimbo
speedometer gear or whatever it is called that you can change to correct the speedometer after getting different gears. anyway would the dealer have what i need to get my speedometer accurate after going from 235/75/15 tires and 3.55 gears to 33inch tires with 4.56 gears???

thanks for any help
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440Ramcharger
Duffy has it.
What I have used and works for me is the following:
Drive down the freeway using a GPS and have the GPS read 60 mph.
Read the value of your dash speedometer, if your speedo reads HIGHER than 60, you need to go with a gear that has MORE teeth. Like Duffy said, each tooth of the speedometer gear is about 3 mph at 60 mph. Use a gear with LESS teeth if your speedo reads LOWER than 60 mph. And again, 3mph per tooth of the speedo gear.
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