Murph72

So I'm wondering if I can run 37's without making changes to the gears of a Stock Rubicon? I plan on getting a fairly complete 4 inch coil lift

I've onwed 4 jeeps over the past 20 years but have always run stock. As I get older and look to purchase a new 2012 I definetely have TIRE/LIFT envy. Love the outdoors but the extent of my 4 wheeling is limited to mud and snow in the woods of Maine during hunting seasons. Nothing too extreme. It's also my daily driver.

Thoughts and suggestions appreciated.

TXJimmy

37's = Re-gear
My 6 speed Rubi is a dog now running 35's.
6 th gear is pretty much useless now.

nthinuf

Can you? Yes.
Will you enjoy it? No.

Stickied at the top of this modified area are some Faq's. Open the Drivetrain section and plug some numbers into the rpm chart to see where you'll be.

Murph72

awesome. thanks for the quick response guys

walker111

Will the new power and torque of the 2012's make it a little better?

Biginboca

I don't think it will. I read somewhere that the 2012 Rubi has a lower gearing than the 2011, like 3.73 or something instead of 4.10.

So I am speculating here that regearing for oversized tires is still going to be the way to go.

Biginboca

I forgot to mention, a friend who drove the pentastar equipped Grand Cherokee with the 5 speed auto said it was underwhelming and could use a V-8 instead. So that combined also with lower gearing makes me suspect that no one is going to be much more successful driving 37's in a 2012 without regearing.