Regearing a 2010 JKUR

[ccfdcal]

I have a 2010 JKUR which I just put AEV's 3.5" lift on. I'm currently running the stock Rubi wheels and tires until my wallet plumps up a bit. I also tow a Sierra4x4trailer with a RTT when I go camping. I'm planning on upgrading the tires to 35's in a couple weeks. I hear a lot about changing gears to overcome the bigger tires and helping out when towing. I've also heard many opinions about just adding a chip and improving the exhaust system. I'm looking for advice on the subject. I'm leaning towards regearing, I'm just not sure what would be the appropriate gearing for my set up.

[CCFD170]

Just put a Hemi in it!!

[Bigjerm]

Auto or manual? If Auto I would say 5.13's and manual I would say maybe 4.88's but with the trailer maybe just 5.13's as well. How often do you tow?

[Rovertrader]

I am running the AEV 3.5 w/ 37's and 5.13s and am well pleased, auto by the way.

[ccfdcal]

I've got the Auto transmission

[ccfdcal]

I am running the AEV 3.5 w/ 37's and 5.13s and am well pleased, auto by the way.

What type of mileage do you get with that combo? Do you notice any loss off the top end, say at around 80?

[JIMBO]

You have a Rubi, so my advice would be have a good suspension shop install YUKON (ALL NEW)/w rebuild kits--5.38 gears--

I also tow a 1000 lb trailer and with my '08 JKUR, that weighs 5200 lbs--UNLOADED-I've had on-road/off-road pure happyness and a new jeep with good mileage/power/immediate throttle response and that coupled /w aux cooling system, my auto stays 150° freeway travel and never gets over 210° off-road-hills/rocks-etc



The single most beneficial mod I've made to this jeep in three 1/2 years (51 mods)-

If you're gonna run anything over 33" in diameter--use 5.38s--I wouldn't consider any ratio below 5.13s, my mileage went up from 15.2 (4.10 gears) to 17 mpg and almost 16mpg towing the trailer-

JIMBO

[Black_ZJ]

You have a Rubi, so my advice would be have a good suspension shop install YUKON (ALL NEW)/w rebuild kits--5.38 gears--

I also tow a 1000 lb trailer and with my '08 JKUR, that weighs 5200 lbs--UNLOADED-I've had on-road/off-road pure happyness and a new jeep with good mileage/power/immediate throttle response and that coupled /w aux cooling system, my auto stays 150° freeway travel and never gets over 210° off-road-hills/rocks-etc

The single most beneficial mod I've made to this jeep in three 1/2 years (51 mods)-

If you're gonna run anything over 33" in diameter--use 5.38s--I wouldn't consider any ratio below 5.13s, my mileage went up from 15.2 (4.10 gears) to 17 mpg and almost 16mpg towing the trailer-

JIMBO

I would think a drivetrain shop would be more accommodating than a suspension shop....

[JIMBO]

Actually a race shop is probaby the best, but

You have to find any shop with a good rep--this is a major mod to the suspension -

I would think a drivetrain shop would be more accommodating than a suspension shop....

You should find a shop-have them buy the gears and take care of the whole deal-and they can take care of any warranty problems-

I had mine done by a race shop in Reno--no problemo

JIMBO

[mvbeggs]

..I also tow a 1000 lb trailer and with my '08 JKUR, that weighs 5200 lbs--UNLOADED-....
The single most beneficial mod I've made to this jeep in three 1/2 years (51 mods)-

If you're gonna run anything over 33" in diameter--use 5.38s--I wouldn't consider any ratio below 5.13s, my mileage went up from 15.2 (4.10 gears) to 17 mpg and almost 16mpg towing the trailer-

JIMBO

Wow! Increase weight, add larger tires, regear AND gas mileage improves?! That hasn't been my experience.

My Jeep has also gained some weight from the mods....probably north of 6,000lbs. My Jeep started out as a 2011 JKUR. I was getting about 15 mpg before the mods. After adding bumpers, sliders, axles, regearing to 5.13, adding heavy beadlocks and 37" tires...and using an AEV Procal to recalibrate the speedometer/odometer...I was in the 13mpg range unloaded and not towing. Loaded and towing the trailer on a 3300 mile trip, I averaged about 11mpg. This was all with the original 3.8l. In this configuration, the Jeep did fine on the flats. Running through Montrose and Vail passes in Colorado was a different story. Even geared 5.13 the Jeep struggled to maintain 45mph up these grades while loaded and towing the trailer.

Running 80mph down the highway in the above configuration yielded about 2400 rpm , If I recall correctly.

Good luck with the build.