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Old 03-21-2015, 04:42 PM
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35" tires and regearing

So everyone talks about regearing for large tires. My jeep is coming with the max tow package which means it'll have 3.21 gear front and back. Would I still need to regear for 35" tires (planning on 2.5" budget boost)?

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Old 03-21-2015, 04:56 PM   #2
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Auto or manual? Towing anything? What type of driving will you be doing? Will you need to? Maybe not. Will you want to? Probably.

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Old 03-21-2015, 04:59 PM
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Manual transmission. Half highway, half around town but not tons of either because I work from home. I do spend a fair amount of time out on some land without owned roads... some logging roads, ag fields. Nothing like just wheeling for the heck of it in the foreseeable future...
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Old 03-21-2015, 05:00 PM   #4
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Yeah, the 3.21s are the basic/standard that come with a jeep. You'll definitely want to go with 4.10s at a minimum, certainly higher if you plan on towing and off roading. If you're planning on upgrading the bumpers to something sturdier and adding a winch, the 2.5" lift will be tight.

Where in MO are you btw?
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Old 03-21-2015, 05:13 PM
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Sorry, I misunderstood the jeep site. 3.21 was removed for 3.73. So I'm halfway there. I do plan on doing some towing. I'm supposed to be getting 3500 capacity as is... I'm more concerned with damage and just making sure I can do the speed limit and then some.

Oh and I'm in Imperial, just south of St Louis.
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Old 03-21-2015, 05:15 PM
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How much does regearing cost anyway?
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Old 03-21-2015, 05:23 PM   #7
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I have seen from about $1500 - $2000 parts and install.
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Old 03-21-2015, 05:27 PM   #8
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Check out hellbent in chesterfield, they quoted me under $2k for mine with parts and labor. They're pretty much a jeep shop
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Old 03-21-2015, 05:28 PM   #9
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I've never had 35s or regeared but have read many threads and it seems that it comes down to how you drive, where you drive, what tires you get and what your expectations are. It seems that if you go with a lighter tire and don't offroad too hard you may be happy with 3.73 but if you want to regear it won't be so terrible that you will feel the need to do so asap.
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Old 03-21-2015, 05:32 PM
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That was going to be my next question: is there harm in not doing it right away and just seeing what I want?

Right now my plan is to start with 2.5" BB and 33's or 35's and just monitoring the situation. But the 33 or 35 question is the one that could cost me $$ if I change my mind...
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Old 03-21-2015, 05:41 PM   #11
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Nope, no harm in driving it as it comes, and seeing how you like it.

Split the difference and find a set of 285/75s, and go with those. Also, keep in mind that 385/75s are about the same height as a "35"" tire.

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Old 03-21-2015, 05:53 PM   #12
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Added 35s to our 2012 JKU. It sucked. Regeared to 4:56 the changes are awesome. High at 70 is no problem you can go faster but I don't. 16 mpg with the regear 14 without. I recommend it but it will be up to you. I love the regear so much I am doing to my 06 too.
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Old 03-21-2015, 05:55 PM
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Thanks!

I guess I was worried about getting into the position of forcing myself to regear for fear of damaging something. Not likely?
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Old 03-21-2015, 05:58 PM   #14
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Thanks!

I guess I was worried about getting into the position of forcing myself to regear for fear of damaging something. Not likely?
Nope.
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Old 03-21-2015, 06:02 PM   #15
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Consider the strain it puts on the tranny by not re-gearing
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Old 03-21-2015, 07:52 PM   #16
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Consider the strain it puts on the tranny by not re-gearing
This. Regearing should not be a "preference" or "will I like it/can I tolerate it based on my driving style thing". You are increasing stress on your engine and transmission. Period. You spend a crap ton of money buying a rig, a crap ton of money on lifts, wheels, tires, bumpers and other assorted stuff but then try to justify not regearing to save some cash? That is backwards. Big Jeeps are not a budget sport. Pony up for gearing when going to bigger tires. Just because higher (numerically lower) gears get you from point a to point b is not the entire picture.
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Old 03-21-2015, 07:58 PM   #17
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Then there is the tactic that I am not going to regear until the engine blows and I can get a hemi.
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Old 03-21-2015, 08:03 PM   #18
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I've had 3.21 on a 2012 with 285/70/17
Current jeep 3.73 on oem willys
I'm able to use 6th gear on the 3.73 willys @40mph to highway speeds. I can only use 6th over 60mph on 3.21 but it won't propel the jeep as fast as the 3.73.
Last, I just installed 35's on my 3.73. I'm able to use 6th gear without lugging at 45mph. I have no plans to regear with the 3.73. Good enough for me.
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Old 03-21-2015, 08:07 PM   #19
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Yes, you will need to re-gear!!!!!!!
3.6 with 35's needs the 4.56 for optimum Ratio.....

Costs vary by area, but it Phoenix it ranges from $1200 to $1800, for P&L.
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Old 03-21-2015, 08:15 PM   #20
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When you look at charts and different formulas it appears that 35s are a better match for 3.73 then 32s are with 3.21. Is jeep sending out doomed vehicles from the factury? Any recommendations on technical sites that explain the science behind gearing?
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Old 03-21-2015, 08:26 PM   #21
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Running 3.73 gears & 35's. No issues as a DD or towing 2000lb-3000lb trailers. The only thing that suffers is my gas mileage but of course it's a Jeep..
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Old 03-21-2015, 08:26 PM   #22
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Then there is the tactic that I am not going to regear until the engine blows and I can get a hemi.
I suppose this is also an option ROTFL!
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Old 03-21-2015, 08:33 PM   #23
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When you look at charts and different formulas it appears that 35s are a better match for 3.73 then 32s are with 3.21. Is jeep sending out doomed vehicles from the factury? Any recommendations on technical sites that explain the science behind gearing?
The true factory spec tire on base Sport is 29 inches. I believe the 32s are "upgrades" or with certain packages. Also realize factory tires are much lighter and narrower than the wide heavy offroad tires most folks change out to.

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Running 3.73 gears & 35's. No issues as a DD or towing 2000lb-3000lb trailers. The only thing that suffers is my gas mileage but of course it's a Jeep..
Regards,
Jim
It isnt about "issues" or "can it tow" or "gas mileage" - your engine and transmission are operating under more stress than they would with proper gearing. That is a fact.
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Old 03-21-2015, 08:55 PM   #24
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The true factory spec tire on base Sport is 29 inches. I believe the 32s are "upgrades" or with certain packages. Also realize factory tires are much lighter and narrower than the wide heavy offroad tires most folks change out to.



It isnt about "issues" or "can it tow" or "gas mileage" - your engine and transmission are operating under more stress than they would with proper gearing. That is a fact.
^^^Bingo, you need to think about this!!!!!!

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Old 03-21-2015, 08:58 PM   #25
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I will agree. It was torture running 3:21 with 35. The engine worked hard and the clutch hated it. The regear was the best money spent by far.
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Old 03-21-2015, 09:58 PM   #26
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.....and this is why I'm regearing to 4.56s before I go larger on the tires
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Old 03-21-2015, 10:52 PM   #27
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If you want to piss money down the drain, go ahead and regear. Drink the Kool-Aid...My JKU with 3.73's and 35" tires doesn't work hard at all.

The next time you shop for a Jeep, make sure you get 3.73's or 4.10's.
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Old 03-21-2015, 11:00 PM   #28
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I've got plenty to piss away, plus I'll make it up on improved gas mileage
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Old 03-21-2015, 11:16 PM   #29
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The true factory spec tire on base Sport is 29 inches.
So, based on the chart, a manual trans with 3.73 gears and 34" tires is the same as a Base Sport. And according to the chart is "Minimum allowable gear set for tire size, sluggish performance, minimal OD use, mild trail use at low elevation"?

Begs the question again "Is jeep sending out doomed vehicles from the factory?"

If 34" tires REQUIRES a re-gear in the 3.73 equipped Jeep wouldn't the factory stock Base Sport REQUIRE the same re-gear?
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Old 03-21-2015, 11:23 PM   #30
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If you want to piss money down the drain, go ahead and regear. Drink the Kool-Aid...My JKU with 3.73's and 35" tires doesn't work hard at all.
Bad advice.

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