Gear Change on 2012+
Thread Starter
JK Enthusiast
Joined: Oct 2011
Posts: 191
Likes: 0
From: Childress, Texas
Gear Change on 2012+
I am getting the gears changed this week and my question is how far can I drive it before it goes in to limp mode? I have the BD, so can I go ahead and change it to 4:11 here and then drive it to my mechanic garage which is about 15 blocks away Or can the gears be changed and then he takes it on a test drive and I change it when i get it back?
How long does it take to go into limp mode?
How long does it take to go into limp mode?
JK Jedi
Joined: Oct 2010
Posts: 5,192
Likes: 3
From: REDONDO BEACH, CA
I'm confused by your question. Changing your gears is NOT going to tell the CANBUS anything to force it to go into limp mode.
I'm assuming you're installing 4.10 gears? From 3.21s or 3.73s? All that will happen with an automatic is your shift points will be off, so the jeep will drive a little strange. Using your tuner will tell the computer the proper gear ratio and then your shift points will be corrected.
It's best to change the settings AFTER the install, not before, but if you must, I don't see a major problem with it. What's the rush? Just play it safe and use the tuner after.
I'm assuming you're installing 4.10 gears? From 3.21s or 3.73s? All that will happen with an automatic is your shift points will be off, so the jeep will drive a little strange. Using your tuner will tell the computer the proper gear ratio and then your shift points will be corrected.
It's best to change the settings AFTER the install, not before, but if you must, I don't see a major problem with it. What's the rush? Just play it safe and use the tuner after.
Last edited by TURTLECON; Jan 10, 2015 at 10:34 PM.
JK Junkie
Joined: Dec 2011
Posts: 2,256
Likes: 1
From: Madison, New Jersey
I'm confused by your question. Changing your gears is NOT going to tell the CANBUS anything to force it to go into limp mode. I'm assuming you're installing 4.10 gears? From 3.21s or 3.73s? All that will happen with an automatic is your shift points will be off, so the jeep will drive a little strange. Using your tuner will tell the computer the proper gear ratio and then your shift points will be corrected. It's best to change the settings AFTER the install, not before, but if you must, I don't see a major problem with it. What's the rush? Just play it safe and use the tuner after.
Preset the turner and give it to the mechanics doing your gears. Also give them the quick reference card
JK Super Freak
Joined: Jul 2007
Posts: 1,381
Likes: 0
From: Rochester, NY
JK Junkie
Joined: Dec 2011
Posts: 2,256
Likes: 1
From: Madison, New Jersey
Trending Topics
JK Junkie
Joined: Jun 2013
Posts: 3,697
Likes: 2
From: Grosse Pointe, MI
JK Enthusiast
Joined: Apr 2014
Posts: 479
Likes: 0
From: Alameda, CA
Newer autos can go into limp due to rpm, shift point and mph confusion in the system.
Newer manuals can give you warning lights if you do anything erratic like turn sharply, while reving the engine in a low gear going around a corner.
Big brother in the jeep is watching..
Newer manuals can give you warning lights if you do anything erratic like turn sharply, while reving the engine in a low gear going around a corner.
Big brother in the jeep is watching..
JK Junkie
Joined: Dec 2011
Posts: 2,256
Likes: 1
From: Madison, New Jersey
Doesn't require you to change the gear ratio. Just the tire size. I've been driving like this for about two years with no issues with traction control working
Last edited by JE8154; Jan 11, 2015 at 09:50 AM.