Power loss from stock tires to 31's?
#1
Power loss from stock tires to 31's?
Let me ask anyone notice any big power loss or hard time moving 31's because of the drop in gearing? I did the calculator and it said from a stock tire and 3.42's you would have to upgrade to around 3.63's or something to keep the gearing around stock etc but without re gearing it would drop the ratio down to 3.23. Did anyone notice a power loss or a struggle moving the tires?
#2
Sure you're going to have a "power loss" of sorts. The drivetrain is turning taller tires. I believe it's from 3:42 - 3:73 - 4:11 - 4:56 are the available gears for us. But you'll get more grip/less spin because of the taller tires but 31's aren't that much taller than the stock 235 75 R15's...
from the online tire size calculator
from the online tire size calculator
#3
Not really sure if this applies to your rig but when we change tire size, gearing etc. the ECM needs to be re-calibrated to change shift points, speedo and so on. You could buy one of the available units or see if a dealership would do it. Good Luck, Hope this helps.
#6
Lower RPM's at highway speed FTW... if you want to pick some gearing up again just bump to 3.73's, you'll have to do it in the front too though...