speedo messed up

[oxdown]

i have a 92' ranger super and its got 33x12.5/r15 and how do i fix the speed reading whhen i go 55mph im going like 65-70 mph. help dont know how to fix

 

[heptofite]

you need to replace the speedometer gear in the transmission with the correct one.

 

[oxdown]

thanks but i cant figure out witch one i have the white 17 tooth gear manual tranny but the math dosent add up right New Teeth = (17x 55)/65. ive got 33/12.5R15 tires