diff gears for 33" tires on a JK. - JeepForum.com
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post #1 of 26 Old 03-26-2014, 07:28 AM Thread Starter
Giano14
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diff gears for 33" tires on a JK.

Hi Guys,

Just a general question here as a NEWBEE. I've done some homework on wranglers and looks like a 2012 sport or sahara is what I want and need. I do want to put 33" tires on this one though so something like 33x12.50R20LT or 18LT.

My Question is:
Is the 3.21 gear ratio ok when putting on 33" tires? Should this be changed?

I will be doing a lot of highway miles so I need top end speed unlike a RUBI - No offloading for me. Just tailgating to games and Skiiing in VT in the winter months.

Thanks
G

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post #2 of 26 Old 03-26-2014, 07:45 AM
Bockwinkle
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manual or automatic? 33's and 3.21's with the manual will require you to really slip your clutch to get moving from a standstill.....and at 70mph on the highway you will be downshifting constantly with any incline or headwind.
I would try to find a 3.73 equipped jeep.....I just picked up a 2012 JK 6spd with 3.73s and with the factory 32s I am at about 2400rpm at 70mph.
If you are buying a 4dr JKU with hardtop (heavier) then I would say don't even consider a 3.21s......if you are buying an automatic I have no idea.
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post #3 of 26 Old 03-26-2014, 08:11 AM
Lenny7
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I have 32.something, just under 33" on my 3.73 auto. It does fine. A tad slow when I punch it. I think 3.21 might be annoying at best.
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post #4 of 26 Old 03-26-2014, 08:18 AM
yjcrawlr
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New jku with 33s 3.73s and a auto. Power is great but my mileage did go down a tad. Usually bouncing around 17.5mpg. Overall very pleased with the gearing.

90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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post #5 of 26 Old 03-26-2014, 08:34 AM Thread Starter
Giano14
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Sorry Guys, I will definitely buy a standard 6 speed 4 door soft top only

doesn't this come standard 3.21?
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post #6 of 26 Old 03-26-2014, 08:46 AM
ROCKR8R
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Scour for 3.73 equipped JK. You will regret 3.21. IMO that is a useless gear ratio, even if you NEVER off-road and only street it.

I would also advise against 20" wheels or even 18" wheels. Of course it's your Jeep and that's what your into, go for it, but rubber and especially off-road tires are insanely expensive for 20's and 18's. If you want the off-road look then 16 or 17" wheels will look 10x better and the rubber will be a lot less money. You can probably get a set of 16" wheels AND tires for the price of MT tires alone for 20's.

On the same note, if you are going for the 4x4 look, 20's scream "oh he doesn't take it off-road."

-Dan
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post #7 of 26 Old 03-26-2014, 09:15 AM Thread Starter
Giano14
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ROCKR8R -

I think you're right about the 17". The rim size doesn't really bother me as long as I can get 33" tires AND a rim that is a lot wider like 12.5. I just really hate the skinny wheel on these new wranglers. Im assuming that the smaller the rim the fatter the tire and more comfortable the ride will be on bumps?

I will probably have all black rims anyway.
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post #8 of 26 Old 03-26-2014, 09:49 AM Thread Starter
Giano14
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Lenny7 - wont i lose top end speed on the highway though with 3.73? I'm getting a manual
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post #9 of 26 Old 03-26-2014, 10:05 AM
bhoch
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Quote:
Originally Posted by Giano14 View Post
Lenny7 - wont i lose top end speed on the highway though with 3.73? I'm getting a manual
I have 3.73 gears and 33's (well, 305/70/16's) currently. How fast do you plan on going?

I'm about 2400 rpms at 70 MPH.

I am moving to 4.56 gears soon, though.. and will go to 35' whenever I need tires next. It is my DD (about 55 miles a day) as well.
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post #10 of 26 Old 03-26-2014, 10:45 AM
LVCapo
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Avoid the 3.21 at all costs....unless the dealer is willing to knock off enough to cover a gear change for you. If not, demand 3.73s
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post #11 of 26 Old 03-26-2014, 11:51 AM
TheBoss
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3.73's are what you want to have. I would suggest going with a 17" wheel size for a wider available tire selection. Your ride quality will suffer significantly with larger wheel diameters due to the shorter sidewall. Take that into consideration when shopping for tires that will ultimately limit you to e rated truck tires designed for heavy duty trucks.
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post #12 of 26 Old 03-26-2014, 01:59 PM
BobbySwiz
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So uh, how do you guys know which gears your jeep has? I bought mine over 5 years ago and have no clue if I have 3.21 or 3.73. I have an '09 2 door X

--US COAST GUARD--
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post #13 of 26 Old 03-26-2014, 02:20 PM
yjcrawlr
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a jeep dealer can tell you by the vin number. Most axles have a little tag on them that tells the ratio.

90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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post #14 of 26 Old 03-26-2014, 02:27 PM Thread Starter
Giano14
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Bobbyswiz -

Most likely 3.21 come standard. But 3.73 is always an option. Should stay on the original sticker price if it takes a while finding out thru dealer
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post #15 of 26 Old 03-26-2014, 07:52 PM
LVCapo
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Quote:
Originally Posted by yjcrawlr View Post
a jeep dealer can tell you by the vin number. Most axles have a little tag on them that tells the ratio.
Believe it or not, the JKS don't.
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