Gear ratios
#1
#3
there should be an axle code on the sticker in the door jam. there also is a tag on the differential that will tell you what the gear ratio is and if it is a traction lock rear. If you want the engine rpm to be the same with 37" tires as it would have been with stock tires divide 37 by the stock tire diameter and multiply this by the stock gear ratio to determine what the new ratio would need to be.
Last edited by Roadie; 03-24-2018 at 10:30 AM. Reason: corrected math
#5
there should be an axle code on the sticker in the door jam. there also is a tag on the differential that will tell you what the gear ratio is and if it is a traction lock rear. If you want the engine rpm to be the same with 37" tires as it would have been with stock tires multiply divide the stock tire diameter by 37 and multiply this by the stock gear ratio to determine what the new ration would need to be.
#6
there should be an axle code on the sticker in the door jam. there also is a tag on the differential that will tell you what the gear ratio is and if it is a traction lock rear. If you want the engine rpm to be the same with 37" tires as it would have been with stock tires multiply divide the stock tire diameter by 37 and multiply this by the stock gear ratio to determine what the new ratio would need to be.
#7
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#8
#9
http://4lo.com/calc/gearratio.php
A bit confused - are you wanting to regear the truck, or are you just looking for the data to enter in the programmer to correct the speedometer and odometer?
If you want to regear, get 4.56. If you just want to do the correction, use trial and error till the speedometer corresponds with a GPS.
A bit confused - are you wanting to regear the truck, or are you just looking for the data to enter in the programmer to correct the speedometer and odometer?
If you want to regear, get 4.56. If you just want to do the correction, use trial and error till the speedometer corresponds with a GPS.
#10
If you want the engine rpm to be the same with 37" tires as it would have been with stock tires divide 37 by the stock tire diameter and multiply this by the stock gear ratio to determine what the new ratio would need to be.
If you don't want to do this calculation tell us what the original tire size was and we will do it for you.