BenJKWrangler15
New member
Alright lads, so I've been thinking about regearing a lot and I know all the parts I'll need in order to do it. Thing is, I'm still debating on the gear ratio I'm going to use.
Now, this is a formula I got off Can'tSayTheNameItsForbiddenByForumRules and here's how it works. You take whatever tire size you plan on running times your current gear ratio and divide the result by your OEM tire size and that should give you the approximative gear ratio you should go with in order to have the best power/fuel economy ratio out of your gearing.
So in my case, I run a 33" tire size, have 3.21 gear ratio and my OEM tire size was about 29". Sooo
(33"x3.21)/29" = 3,65 GR ish.
From there, you select the closest next available gear ratio in order to get the power/fuel economy thing going your way. So in my case I should go with 3.73, according to this equation.
Note, the number you'll end up with isn't set in stone depending on what you plan on doing with your rig and how you wheel it. It's a guideline.
Now, in order to run my 33's at the "best" possible gear ratio match, I should re-gear with 3.73.
But fxck that.
You see, it's already expensive enough to regear, now in order to do this right and only once for my own rig application and what's next to come in the future, I did the math with a 35" tire size and a 37" tire size.
Here are the results:
(35"x3.21)/29" = 3.874 GR
(37"x3.21)/29" = 4.095 GR
So running 35's, the best way to go would either be with the same GR as the 33's, 3.73, or the next available GR which would be 4.10.
If I was to run 37's on the RaccøønJK, the best GR according to the equation would be 4.10.
Now, note that my current Dana's are the 30 Front and 44 Rear as my rig is a latter 2015 JK model. To regear the front I'll need a new carrier (differential) and the appropriated gear & pinion while in the back all I'll need will be new gear & pinion.
I know the D30 is a "lemon" when it comes to bigger tire configuration and I heard my fair share on horror story related to it. But for now it'll stay as is.
I'm an NOT planning on running an air locking differential in the NEAR future for my rear D44.
With that being said, with all the math done, what would you recommend on going for as of gears & pinions?
4.10 would be ideal for both 35's and 37 inches tires. It'd be a little over rated for the 33's but from what I understand, a higher(?) ratio will end up giving you more low end torque at the wheels. When I say 4.10 would be ideal, it's by refeering to the equation results stated above for the "best" range of power and fuel economy.
But who gives a goddamn fxck about fuel economy? I ain't driving a fxcking pussy-bitch-ass-cock-blocking Prius for all I know.
Yes, it is still important to take the power/fuel ratio in mind neverthless of the fact that we see driving Jeeps. But anyways...
If I was to regear, would you go with 4.10's as the equation would suggest or a little higher for more low end torque, like a 4.56 or even 4.88?
PS : The day that I'll change my tires for anything more than a 37" will be the day I'll be putting "new" Danas under the RaccøønJK. For the time being, it'll stay a D30 in the front and a D44 in the back, unless I can put my hands on a second-hand set or front only Rubicon Dana 44s.
So, any thoughts?
Thanks in advance!
Now, this is a formula I got off Can'tSayTheNameItsForbiddenByForumRules and here's how it works. You take whatever tire size you plan on running times your current gear ratio and divide the result by your OEM tire size and that should give you the approximative gear ratio you should go with in order to have the best power/fuel economy ratio out of your gearing.
So in my case, I run a 33" tire size, have 3.21 gear ratio and my OEM tire size was about 29". Sooo
(33"x3.21)/29" = 3,65 GR ish.
From there, you select the closest next available gear ratio in order to get the power/fuel economy thing going your way. So in my case I should go with 3.73, according to this equation.
Note, the number you'll end up with isn't set in stone depending on what you plan on doing with your rig and how you wheel it. It's a guideline.
Now, in order to run my 33's at the "best" possible gear ratio match, I should re-gear with 3.73.
But fxck that.
You see, it's already expensive enough to regear, now in order to do this right and only once for my own rig application and what's next to come in the future, I did the math with a 35" tire size and a 37" tire size.
Here are the results:
(35"x3.21)/29" = 3.874 GR
(37"x3.21)/29" = 4.095 GR
So running 35's, the best way to go would either be with the same GR as the 33's, 3.73, or the next available GR which would be 4.10.
If I was to run 37's on the RaccøønJK, the best GR according to the equation would be 4.10.
Now, note that my current Dana's are the 30 Front and 44 Rear as my rig is a latter 2015 JK model. To regear the front I'll need a new carrier (differential) and the appropriated gear & pinion while in the back all I'll need will be new gear & pinion.
I know the D30 is a "lemon" when it comes to bigger tire configuration and I heard my fair share on horror story related to it. But for now it'll stay as is.
I'm an NOT planning on running an air locking differential in the NEAR future for my rear D44.
With that being said, with all the math done, what would you recommend on going for as of gears & pinions?
4.10 would be ideal for both 35's and 37 inches tires. It'd be a little over rated for the 33's but from what I understand, a higher(?) ratio will end up giving you more low end torque at the wheels. When I say 4.10 would be ideal, it's by refeering to the equation results stated above for the "best" range of power and fuel economy.
But who gives a goddamn fxck about fuel economy? I ain't driving a fxcking pussy-bitch-ass-cock-blocking Prius for all I know.
Yes, it is still important to take the power/fuel ratio in mind neverthless of the fact that we see driving Jeeps. But anyways...
If I was to regear, would you go with 4.10's as the equation would suggest or a little higher for more low end torque, like a 4.56 or even 4.88?
PS : The day that I'll change my tires for anything more than a 37" will be the day I'll be putting "new" Danas under the RaccøønJK. For the time being, it'll stay a D30 in the front and a D44 in the back, unless I can put my hands on a second-hand set or front only Rubicon Dana 44s.
So, any thoughts?
Thanks in advance!
