why do i need to regear with larger tires?
#1
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Model: Cherokee
why do i need to regear with larger tires?
Please hear me out before leaving.stupid replies.
I want to understand the meaning behind regearing. Is it the size of the.tire or the weight that affects it?
I ran heavy 36s on 3.55 with a 5 speed for some time and it drove alright. I plan on going to 38s, and im wondering how that will feel compared to the 36s. If i get some light tires, would it feel the same?
I guess what i want to know is if its the diameter or the rotating mass that affects the gearing. Ill be regearing anyway, but im curious.about the science behind it.
I want to understand the meaning behind regearing. Is it the size of the.tire or the weight that affects it?
I ran heavy 36s on 3.55 with a 5 speed for some time and it drove alright. I plan on going to 38s, and im wondering how that will feel compared to the 36s. If i get some light tires, would it feel the same?
I guess what i want to know is if its the diameter or the rotating mass that affects the gearing. Ill be regearing anyway, but im curious.about the science behind it.
#2
CF Veteran
Please hear me out before leaving.stupid replies.
I want to understand the meaning behind regearing. Is it the size of the.tire or the weight that affects it?
I ran heavy 36s on 3.55 with a 5 speed for some time and it drove alright. I plan on going to 38s, and im wondering how that will feel compared to the 36s. If i get some light tires, would it feel the same?
I guess what i want to know is if its the diameter or the rotating mass that affects the gearing. Ill be re gearing anyway, but im curious.about the science behind it.
I want to understand the meaning behind regearing. Is it the size of the.tire or the weight that affects it?
I ran heavy 36s on 3.55 with a 5 speed for some time and it drove alright. I plan on going to 38s, and im wondering how that will feel compared to the 36s. If i get some light tires, would it feel the same?
I guess what i want to know is if its the diameter or the rotating mass that affects the gearing. Ill be re gearing anyway, but im curious.about the science behind it.
#3
Use the Gear Calculator at www.Grimmjeeper.com to see the affect of larger tires on your engine RPM's and MPH.
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Year: 1998
Model: Cherokee
Engine: 4.0L
So how do you know how much you need to regear?
If the factory gear provides a 1:1, how do you calculate the re-gear?
Do you need to re-gear both differentials at the same ratio exactly?
I'm going from stock 98XJ Limited wheels, which I think is 225/75-15 to 31x10.5R15. Assuming some added weight from suspension, heavier tires, bumpers and other stuff, how do you make up for the extra weight in the calculation?
Thanks.
Do you need to re-gear both differentials at the same ratio exactly?
I'm going from stock 98XJ Limited wheels, which I think is 225/75-15 to 31x10.5R15. Assuming some added weight from suspension, heavier tires, bumpers and other stuff, how do you make up for the extra weight in the calculation?
Thanks.
#6
CF Veteran
If the factory gear provides a 1:1, how do you calculate the re-gear?
Do you need to re-gear both differentials at the same ratio exactly?
I'm going from stock 98XJ Limited wheels, which I think is 225/75-15 to 31x10.5R15. Assuming some added weight from suspension, heavier tires, bumpers and other stuff, how do you make up for the extra weight in the calculation?
Thanks.
Do you need to re-gear both differentials at the same ratio exactly?
I'm going from stock 98XJ Limited wheels, which I think is 225/75-15 to 31x10.5R15. Assuming some added weight from suspension, heavier tires, bumpers and other stuff, how do you make up for the extra weight in the calculation?
Thanks.
Also forgot: you *do* have to regear both diffs at the same time if you plan on using 4x4. If geared differently the front and rear tires will be trying to spin at different speeds and it'll likely blow up your transfer case.
Last edited by Dan91; 03-26-2012 at 04:21 PM.
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