How do you figure? I have the same set up with winch, bumpers, sliders, but no rack and get 15-16 average, running 70mph every day. A lot of it has to do with terrain, air quality, and as well as how hard of a driver you are. Could also depend on what tune you/I are running.

 

Btw, people say all the time how bad of an idea it is to run 37s on a 30, but unless you have an extremely heavy foot on the rocks, you're fine. Plenty of people on here run that big of a tire on the 30, wheel and have no problems, but at least gusset the axle, and sleeve if you can. I'm going to 37s as soon as I can find a buyer for my 35s. I'm locked in the rear and wheel as often as I can.

 

i have to say that you are are trying to talk yourself into justifying trying to run 37s on a dana 30 and at the same time giving really bad advice...to the op do yourself a favor and decide the tire size you want to run and then build the correct axles for the tire size you choose...dana 30s and even jk d44s are nowhere even close to being up to the task...i run custom currie 35 spline 44s cryo treated 5:13s and arb lockers with 37 inch toyos on 17 inch walker evans bead locks...my rig is also a two wheel drive conversion that i did myself so i promise i am only giving you the exact same advise as as what i have already done myself...why take a perfectly good rig and make it completely useless off road by putting huge tires on glass axles just to LOOK the part

 

Lol thanks NEWBiE. My head was all wrong. I must be new to jeeps or something. So glad you cleared it up.

( hate people who try to turn other peoples threads confrontational).

OP, do some reading around on some threads. You can, and many do run 37s on the 30. Not saying its the best, but if it's all you can do for the time being, don't be afraid of it. But, if you happen to have tons of money just laying around like this guy apparently does, then go that route.... Hell, I would. btw, a Jk 44 is plenty up to a 37, if built properly. Guy in our group runs 39s and rarely has issues.

Good luck man, hope you get your situation figured out. IM gonna move on to some other thread.

 

funny you call someone a newbie just because i don't have the spare time to spend all day on my computer to up my posts.and to the op i really am only trying to help and give you honest and correct advice from experience...i actually fully built my own jeep and have pulled both the jk dana 30 and 44 apart ,i also have a degree in engineering but hey what do i know...

 

08, 4.11s with 35" Toyos. I get 14.5 MPH on flat highways while traveling at 78MPH.

 

I have 2012 JKUR auto with 37's, Yukon 4.88's, fully armored head to toe and I love it. I average 14.5 on the highway doing around 70-75. As far as being sluggish, I think it has plenty of power. Especially with those big tires on it. Logged about 4k miles on it so far.