What gears did you guys get for your JKUs with 35s?

2012-2018

I would love to hear your experiences. Brands, ratio, mpg, power difference, COST, etc.


I am planning/dreaming for the future. Considering supercharger for the 3.6.

From reading, watching videos etc, it sounds like a pretty good idea to get gears. Especially if a supercharger is added.

thanks for the input.

 

In regards to gear size, many often refer to these charts.

3.6L


3.8L


From my current understanding, the tire size on the left goes by actual size. So if you have "35s", you're typically closer to 34in actual. For 35s and the 3.6L with auto trans and a daily driver that sees some offroad, 4.56 seems to be the most popular/common gear size. I have no personal experience to be able to provide further details and will defer to other's feedback.

 

My 2015 A/T Rubicon had 3.73 gears stock. My 2013 M/T Rubicon had 4.11 gears stock. The 4.11’s were a PITA with the M/T because I was having to shift three times before even crossing an intersection, but it did perform better at speed than my 3.73 ‘15. Soooo.... when I put 35’s on my ‘15 I decided to re-gear to mimic the 4.11 performance. 4.56 worked out almost perfect. My freeway RPM’s with the 4.56 and 35’s are almost exactly what they were with the 4.11 and stock Rubicon tires. My Jeep is my daily driver so I wanted to maintain its manners.

 

I have a 12 JKR with 4:10 gears and BFG 315 70 12.5 17 KO2’s. The performance is fine for me. 4:56 would be better but not worth the money. In 2012 the 4:10 gears were only another $50.

 

sounds like 4:56 is the way to go. Are there certain brands that are better than others? Anything to stay clear of? How much did it cost to do as a mod after purchase?

thanks guys.

 

4.56 is definitely your sweet spot, and if you have visions of FI down the road, definitely gear it appropriately for your transmission on the pavement. Brand will probably be largely determined by shop, and that being based on their preference, relationships, and cost. Almost always you're going to be better off letting shop purchase all parts in case there is a warranty claim down the road. You can't go wrong with Yukon, but there are many others out there used daily with no issues as well. I would think that the actual quality of labor/install is more important than brand of gear.

 

thank you Sir!!

think they will be around the $3k range ish? Installed?

 

nah. most parts of the country a 2-axle regear is $1500+/-, and that includes parts and labor. That is assuming you're not adding additional costs of lockers or whatnot.

 

noice!!! Thank you again.


I heard the same thing about gearing with the supercharger and transmission. I will be running 35” mud grapplers and figure it is worth the money to gear. Especially after paying the $6k for the ripp.

 

I don't recall seeing, did you pull the trigger trading in the 3.8L, or are you just thinking about moving to 3.6L?