Transmission

I have a 2011 jeep wrangler sport and I bought it with bigger tires than stock and didn't up the trans or gears on the front or rear axles. What's the next size up transmission and gears for a rearend and frontend? Assuming everything is factory stock right now

 

35-12.5-17 I'm assuming stock

 

I have no idea what it came with from the factory

 

Welcome! The 2011 JK running 35s could be challenging depending on how its expected to perform off road or on the road as the engine specs or seat-of-the-pants will reveal. Check out the chart for reference as many 3.8L owners have the same issue as you with 35s.

3.8-liter V6
202 horsepower @ 5200 rpm
237 lb.-ft. of torque @ 4000 rpm
EPA city/highway fuel economy: 15/19 (4WD, manual), 15/19 (4WD, automatic)

 

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Explain this chart a little aggrex. I’m assuming that it’s the best gear ratio for the tire size?

 

Its just a reference chart for the 3.8L (AT/MT) that shows the effect on rpms @ 70 mph when comparing larger than stock tires. Running larger than stock tires can result in sluggish performance and reduced effectiveness of 6th gear for example at highway speeds. Generally after selecting the larger tire size to run the recommendation is to REGEAR towards upper yellows to greens for stock or better performance. Your overall usage of the JK as a DD or trail rig will guide you in the right direction.