should I regear?
Thread Starter
JK Super Freak
Joined: Jan 2011
Posts: 1,531
Likes: 1
From: Cape Cod
should I regear?
I have a 2010 2dr sport with auto trans. It came with those wonderfull steel rims and tiny tires. I am going to be running a 275/70/r18 (33") on the sahara rim. Should I regear? I see a lot of higher speeds 50+.
JK Newbie
Joined: Oct 2009
Posts: 13
Likes: 0
From: Dubai
No should not be necessary to change the gears, stock gears and 33's is okay both on and off road.. I ran stock gears and 33's for one year before chaning to 37's and 5,13. and yes i have an auto tranny as well 
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
What gears do you have? And have you found the RPM charts in the faq's yet?
Assuming a 32" actual height for the new 33's, you will be looking at:
OD On
3.21's = 1629 rpm @ 70mph
3.73's = 1892 rpm @ 70mph
4.88's = 2476 rpm @ 70mph
5.13's = 2603 rpm @ 70mph
OD Off
3.21's = 2360 rpm @ 70mph
3.73's = 2742 rpm @ 70mph
Just keep OD Off until you get around to a re-gear and taller tires.
Assuming a 32" actual height for the new 33's, you will be looking at:
OD On
3.21's = 1629 rpm @ 70mph
3.73's = 1892 rpm @ 70mph
4.88's = 2476 rpm @ 70mph
5.13's = 2603 rpm @ 70mph
OD Off
3.21's = 2360 rpm @ 70mph
3.73's = 2742 rpm @ 70mph
Just keep OD Off until you get around to a re-gear and taller tires.