change gears to match new tire size
#1
05-27-2017, 01:16 PM
Join Date: May 2017
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change gears to match new tire size
Hello all,
Last year I put a 6" lift on my 2007 F150. It was stock before, and now I have 35" tires on it. The stock gear is 3.73 on a 9.75 axle. Can anyone help me or lead me in the right direction to figure out what size gears I would need to change to go back down to stock. Not sure if there is some sort of spread sheet or if someone else has done this already.
Thanks.
Last year I put a 6" lift on my 2007 F150. It was stock before, and now I have 35" tires on it. The stock gear is 3.73 on a 9.75 axle. Can anyone help me or lead me in the right direction to figure out what size gears I would need to change to go back down to stock. Not sure if there is some sort of spread sheet or if someone else has done this already.
Thanks.
#2
05-27-2017, 05:24 PM
http://4lo.com/calc/gearratio.php
You will need to know the stock tire size. Use 1 for transmission and transfer case ratio, only to keep it consistent. Use 3.73 and pick a rpm, solve for mph. Then use the same mph and rpm, change to 35 tires, solve for ratio.
You will need to know the stock tire size. Use 1 for transmission and transfer case ratio, only to keep it consistent. Use 3.73 and pick a rpm, solve for mph. Then use the same mph and rpm, change to 35 tires, solve for ratio.
