2012 3:21 with 35" chime in

flotto said:
I've been running this setup for 10k miles and have zero complaints. I won't touch my gears till I get the money to go up to 37s. I drive 25 miles each way to work.
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Did you see a big change in gas mileage. I know its a jeep but still wondering. .:confused:

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gtony12 said:
Did you see a big change in gas mileage. I know its a jeep but still wondering. .:confused:

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couple miles per gallon. I'm mostly highway each way to and from work and I usually get 15.5-16.0 mpg. I don't live in the flattest area either though.
 
I am getting 17-18 with my 33's and 3.21's. I want 35's but i dont like going in low range for pretty much anything offroad which would be even worse with 35's.
I would do it if i were planning on upgrading the gears within a few months.
 
I am looking st 295/70/r18 measure to near 34.6 or 34.8 go between 33 and 35. :banghead:

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I get 13.5-15.5 mpgs with 35s and 3:21s. The loss of power and bad shifting I get pretty much bumped the regear to being the next major upgrade instead of the winch as originally planned.
 
Recap, got the 35's installed and used a Superchips FlashCal to reprogram the speedo and automatic shift points. granted, I live in Florida and most of my travel is flat road, but the vehicle almost seems more responsive since using the FlashCal.:idontknow: I made sure to measure the actual height of the 35's which was 33.5":thinking: will update when I take it off road and on some grades and obstacles:brows:
 
Cool thank you for the updates. I am getting ready to buy tires and all the help from every one has been a great help in my decision. Not to many places you can go and actually get real world advice , if that makes sense. :thumbup:

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MPG only seems to have gone down by just over 1 mpg. was getting 17 and now 15.8. Well worth it for the new look of my BLACKED OUT JK
 
I was running 35s with 3.21 on a 2013 JKU Auto and it was ok. Mileage wasn't too bad on the freeway if there weren't any strong winds and the trans would stay in 5th. I averaged 15ish mixed and maybe 19 if I drove about 60-65 on the freeway and it was flat. Hills would drop the mpg back down to 15. As of last week, I have since regeared to 4.88 and I must say I am happy I did it. Transmission shifts quicker and is no longer trying to hold on to the gears longer than it needs to. I should have done it much sooner and I can say the Jeep is now much more responsive on the road. I had the work done at ORE and thumbs up to Drew for taking care of me.

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JK-JOHN-E said:
I'm running the same 3.21 and my 35's are getting ready to be installed on Saturday. Gonna use Superchips flashcal. I we let you know how it works next week. Wish I had the funds to add the gears now.:standing wave:
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Jk-john

How's your 35's wanted to see how it turned out:) add some picts

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It was a dog with 35's and 3.21 gears. Much better with 4.88's. It has a lot more balls now and climbs like a badass.
 
Gears seem to be the most overlooked upgrade out there. But probably IMO one of the best things you can do for your jeep if your gonna run bigger tires.
 
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