Help me avoid a speeding ticket!

[dmicucci]

I just installed 4.56 gears up from 3.73s in my Ranger. combined with the 33in tires up from 215/75/15 tires, how do i figure out how far off my speedo is?
This would be handy to know coming home from parties lol...

I know it should be close again but how close?

 

[Apollo]

http://www.therangerstation.com/tech_library/Speedometer_Change_From_Tires.html
have fun

 

[Apollo]

sorry wasnt paying attention to what i was reading i skipped over your gear change so the link i gave you isnt going to realy help.

 

[86ford]

the actual gearing is 3017 with a 27 inch tire and 3.73 compared to 3018 with 33s and 4.56. so your change is so minimal i dont even think its worth calculating. you are talking the diffrence between new tires and worn tires.

reffrence
http://www.therangerstation.com/tech_library/gearandtirechart.html


86

 

[Squidward_94]

I've gone from 3:73s and 31's to 4:56s and 33's and my speedo said I was going 5km/h to 10km/h faster than I actual was, so if the speedo said 80 I was only actual going 70.
To fix it I changed the little speedo gear in the transfer case.

 

[Dave R]

215/75/15 tires with 3.73 gears would be 2672 rpm at 60mph (in 4th)

33" tires with 4.56 gears would be 2744rpm at 60.

Not enough of a difference to be worried about.

 

[dmicucci]

Thanks guys. i didn't realize it would be such a small difference. I'll just figure it out when i put on the 35's.