I was told that the Rubicons with an auto trans only came with 3.73 gearing, is there any truth to that? JIMBO, I have do alot of reading and there are alot of mixed opinions. I will be using the jeep for light off roading, local driving and occasionally highway use. I am very curious to know why you would think I would be misersble. Out of my uses for the jeep, what driving would make me the most miserable, highway? Thanks for your help!
2012-2013 Rubicons come standard with 3.73 gears with 4.10 as an option. However previous models 2007-2011 Rubicons came with 4.10's with the auto.
Depending on your geographical area ie flatland or continuous grade and elevation changes the 35's may be "liveable". If do it ,pick up a programer such as the Procal to adjust the computer for the size difference. Tire weight will also effect the overall "feel" of the Jeep as well.
I have installed a Rustys 3.25 lift and have XD wheels with proper backspacing for 35" tires. I just have to decide on the tire size. I really like the look of the Nitto Dune grappler 315x70-17. The 305x70-17 is not much smaller then the 315x70-17 but is like $80 more a tire. Is the ride that much different between a 315 and a 305? I think the 315 is a little more than a half inch bigger than a 305.
I ran 35X12.5s on the stock Rubi 4.10s. Went straight to the 5.13s after one week driving around town with a weekend run to superlift park. It sucked on highway and off the crawl was still too fast. After the 5.13s it was almost as peppy as the 4.10 with 32s - but can still feel the added weight of the tires.
When I put the 32s back on for highway use - it really gets up and goes! When they are worn I will probably shoot for 33ish for my on highway set...
J Wm Bishop EA, ASADE
Waiting for the JAMBOREE at Rubicon is worse than waiting for Christmas...
I am looking for opinions on the largest tire I can effectively run with 4.10's and an automatic transmission. Thanks
Your drivetrain efficiency starts going out the window as you get bigger tires and stay with the incorrect gear ratio. Why don't you go right to the 35 tire like YOU want and see how YOU like how your 4.10s handle it.
Originally Posted by jstrubberg
Regear first, then get new tires. You'll be a lot happier.
This is good advice! I think that gear chart is around here somewhere to tell you what gears for what tires?
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