diff gears for 33" tires on a JK. - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > JK Wrangler Technical Forum > diff gears for 33" tires on a JK.

Labor Day Sale!FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 03-26-2014, 07:28 AM   #1
Giano14
Registered User
2013 JK Wrangler 
 
Join Date: Mar 2014
Location: Norwalk, Connecticut
Posts: 21
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

Giano14 is offline   Reply With Quote
Unread 03-26-2014, 07:45 AM   #2
Bockwinkle
Registered User
2012 JK Wrangler 
 
Join Date: Jul 2006
Location: Parsippany, NJ
Posts: 88
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.
Bockwinkle is offline   Reply With Quote
Unread 03-26-2014, 08:11 AM   #3
Lenny7
Registered User
2008 JK Wrangler 
 
Join Date: Feb 2008
Location: Texas
Posts: 524
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.
Lenny7 is offline   Reply With Quote
Unread 03-26-2014, 08:18 AM   #4
yjcrawlr
Registered User
1990 YJ Wrangler 
 
Join Date: Jan 2008
Location: Southern Oklahoma
Posts: 1,784
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!!!
yjcrawlr is offline   Reply With Quote
Unread 03-26-2014, 08:34 AM   #5
Giano14
Registered User
2013 JK Wrangler 
 
Join Date: Mar 2014
Location: Norwalk, Connecticut
Posts: 21
Sorry Guys, I will definitely buy a standard 6 speed 4 door soft top only

doesn't this come standard 3.21?
Giano14 is offline   Reply With Quote
Unread 03-26-2014, 08:46 AM   #6
ROCKR8R
Registered User
2008 JK Wrangler 
 
Join Date: Sep 2013
Location: Phoenix, AZ
Posts: 339
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
ROCKR8R is offline   Reply With Quote
Unread 03-26-2014, 09:15 AM   #7
Giano14
Registered User
2013 JK Wrangler 
 
Join Date: Mar 2014
Location: Norwalk, Connecticut
Posts: 21
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.
Giano14 is offline   Reply With Quote
Unread 03-26-2014, 09:49 AM   #8
Giano14
Registered User
2013 JK Wrangler 
 
Join Date: Mar 2014
Location: Norwalk, Connecticut
Posts: 21
Lenny7 - wont i lose top end speed on the highway though with 3.73? I'm getting a manual
Giano14 is offline   Reply With Quote
Unread 03-26-2014, 10:05 AM   #9
bhoch
Registered User
2012 JK Wrangler 
 
Join Date: Mar 2012
Location: Lliberty Hill, TX
Posts: 773
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.
bhoch is offline   Reply With Quote
Unread 03-26-2014, 10:45 AM   #10
LVCapo
Registered User
2013 JK Wrangler 
 
Join Date: Sep 2010
Posts: 1,016
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
LVCapo is offline   Reply With Quote
Unread 03-26-2014, 11:51 AM   #11
TheBoss
Registered User
2012 JK Wrangler 
 
Join Date: May 2010
Location: , Madiganistan, Illi-noise
Posts: 1,850
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.
__________________
[CENTER][COLOR="black"][/COLOR][COLOR="Cyan"]My JK Build thread [url]http://www.jeepforum.com/forum/f22/wanderlust-thebosss-jku-build-1483041/[/url][/COLOR][/CENTER]
[SIZE="1"]JK : AEV, Synergy, JKS, Teraflex, Bilstein, GoodYear, M.B, LoD, Ramsey, Hella, Uniden, Smitty-re-bilt rails, Safari Straps
:sold:WJ : BDS, Teraflex, JK Rubicon shocks, GoodYear, JK wheels :sold: [/SIZE]


[COLOR="Black"][CENTER][SIZE="4"][FONT="Showcard Gothic"][COLOR="Black"][URL="http://groups.jeepforum.com/built-not-bought/"][COLOR="Black"]Built Not Bought #690[/COLOR][/URL][/FONT][/SIZE][/COLOR][/CENTER][/COLOR]
[COLOR="Red"]"I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." Thomas Jefferson[/COLOR][SIZE="2"][/SIZE]
TheBoss is offline   Reply With Quote
Unread 03-26-2014, 01:59 PM   #12
BobbySwiz
Registered User
2009 JK Wrangler 
 
Join Date: May 2008
Location: Bronx
Posts: 155
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--
BobbySwiz is offline   Reply With Quote
Unread 03-26-2014, 02:20 PM   #13
yjcrawlr
Registered User
1990 YJ Wrangler 
 
Join Date: Jan 2008
Location: Southern Oklahoma
Posts: 1,784
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!!!
yjcrawlr is offline   Reply With Quote
Unread 03-26-2014, 02:27 PM   #14
Giano14
Registered User
2013 JK Wrangler 
 
Join Date: Mar 2014
Location: Norwalk, Connecticut
Posts: 21
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
Giano14 is offline   Reply With Quote
Unread 03-26-2014, 07:52 PM   #15
LVCapo
Registered User
2013 JK Wrangler 
 
Join Date: Sep 2010
Posts: 1,016
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.
LVCapo is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.