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Old 03-30-2012, 09:26 PM   #1
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Re-gear Opinion?

I'm slowly learning all this "Jeep" stuff - and lovin' it - but have another dilemma I'm curious about.

Just read a thread on weight vs regearing.
Also seen the "gear charts". Still unsure if I want/should regear.

I have:
2012 JK 2 door
3.73 gears
Automatic tranny
Smittybilt XRC front & rear steal bumpers with rear swing out tire carrier
Quadratec Q9000 winch
Smittybilt side rails
16" steel wheels (including spare on rear)
Nitto 33" Trail Grapplers

I do lots of highway driving (put 5,000 miles on it and haven't even had it 2 months yet1) with plenty of hills.
Plenty of city driving.
Hopes to get off road a lot - mostly trail driving in dirt and mud. No rock crawling.

So - if I want to increase my on road power/driving experience and mpg - would regearing help? According to "the charts" I'm in the sweet spot with the 3.73's.

I also understand the torque converter is responsible for most of my sluggish/bogged down feeling, cuz if I stomp on the gas, and get a downshift, I do just fine.

I will be going to Duratracs when these tires get shot - but that's gonna be awhile.

I'm happy with the vehicle & mods - but want to get "happier"

Thanks for any input/advice!

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Old 03-30-2012, 09:33 PM   #2
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If you're planning on staying with 33" tires, the 3.73 gears should be fine.

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Old 03-30-2012, 09:34 PM   #3
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for you where your at now is fine.. I wouldn't worry about regearing till you get to 35's if you ever do go that big of a tire.. then you would either want 4.10's or 4.56's. BUT even at 35's 3.73's would still be fine for the most part but not as good as it could be
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Old 03-30-2012, 09:34 PM   #4
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You've got a bit of an upper hand with the 12 and 3.73s but those Nittos are crazy heavy.
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Old 03-30-2012, 09:46 PM   #5
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For people with big V-8 trucks, the Nittos are nice tires. For Wranglers they are not. the 2012 has a little more power but it isn't just the power needed to get them going. The rubi at least has the D44 fronts and can support them better but the heavy tires will put strain on the jeeps ball joints/C's/ and axles. But many still get them, I wouldn't. Great tire but the weight isn't worth it IMO unless you get the few they make in C ply
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Old 03-30-2012, 09:49 PM   #6
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Imagine driving through wet cement and then never removing it from your tires. Yep...
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Old 03-30-2012, 09:52 PM   #7
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Thanks. Yeah - noticed this biggest "loss" as soon as I put those meaty tires on there. Was all set to go with the Duratracs (after reading up on them for 12 months I was in Afghanistan) - but my brother (whos a GM at a very well known custom/collision shop in NE ohio) talked me into the big bad Nitto's...I'll just trudge through until they're shot then.
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Old 03-31-2012, 09:33 AM   #8
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Quote:
Originally Posted by rics1997 View Post
The rubi at least has the D44 fronts and can support them better but the heavy tires will put strain on the jeeps ball joints/C's/ and axles. But many still get them, I wouldn't. Great tire but the weight isn't worth it IMO unless you get the few they make in C ply
D30 has the same strength as the D44 just a smaller ring for gearing.
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Old 03-31-2012, 04:44 PM   #9
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Quote:
Originally Posted by Revyjku08 View Post
D30 has the same strength as the D44 just a smaller ring for gearing.
Aren't the axle shafts on the D44 stronger? D44 is 30s to the D30's 27s?
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Old 04-01-2012, 12:56 AM   #10
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Quote:
Originally Posted by sknyfats View Post
I'm slowly learning all this "Jeep" stuff - and lovin' it - but have another dilemma I'm curious about.

Just read a thread on weight vs regearing.
Also seen the "gear charts". Still unsure if I want/should regear.

I have:
2012 JK 2 door
3.73 gears
Automatic tranny
Smittybilt XRC front & rear steal bumpers with rear swing out tire carrier
Quadratec Q9000 winch
Smittybilt side rails
16" steel wheels (including spare on rear)
Nitto 33" Trail Grapplers

I do lots of highway driving (put 5,000 miles on it and haven't even had it 2 months yet1) with plenty of hills.
Plenty of city driving.
Hopes to get off road a lot - mostly trail driving in dirt and mud. No rock crawling.

So - if I want to increase my on road power/driving experience and mpg - would regearing help? According to "the charts" I'm in the sweet spot with the 3.73's.

I also understand the torque converter is responsible for most of my sluggish/bogged down feeling, cuz if I stomp on the gas, and get a downshift, I do just fine.

I will be going to Duratracs when these tires get shot - but that's gonna be awhile.

I'm happy with the vehicle & mods - but want to get "happier"

Thanks for any input/advice!
Don't listen to these guys that are trying to make u re-gear. They all drive the old engine JKs and have no idea what they're talking about. I have a '12 Sahara with 35s and big tires actually- 325/18/65 and 3.21 and have ZERO complains, so honestly, u can run 37s if u want to and u'll be fine. It's a big difference engine wise from the old 3.8 to '12s 3.6...
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Old 04-02-2012, 12:59 PM   #11
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Quote:
Originally Posted by JK NotLimited View Post
Don't listen to these guys that are trying to make u re-gear. They all drive the old engine JKs and have no idea what they're talking about. I have a '12 Sahara with 35s and big tires actually- 325/18/65 and 3.21 and have ZERO complains, so honestly, u can run 37s if u want to and u'll be fine. It's a big difference engine wise from the old 3.8 to '12s 3.6...
I don't know why you are slamming everyone else's comments. They are right with their advice. I have a 2012 JKU Rubicon auto with 4.10 gears running 35" tires and a lot of weight from steel front and rear bumpers, sports cage bolted up to the stock rollbar, winch, full underbody steel skids, rock sliders, and more.

I'm perfectly fine with my 4.10 gearing on level ground, but if I get into a lot of hills or very high in elevation, I'm wishing for 4.56 gears to keep my transmission from dropping out of overdrive so much. If you plan on doing any towing, you have even more reason to regear to keep from sticking your foot in the gas pedal to get moving. My JKU is not sluggish by any means, but it is definitely not as spunky as it was with stock tires and less weight.

For the OP, the 3.73 gears are fine with 33" tires. The stock JKU Rubicon auto has 3.73 gears and 32" tires. The 4.10 gears are an option for the Rubicon auto. You would probably be ok with 35" tires if you are close to sea level and don't drive much in hilly terrain. With the extra weight that you are adding, you will notice a drop in performance, but it won't be traumatic. It probably is not worth spending the money to change gearing unless you change to 4.56 gears.

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