New Jeep upgrade - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 05-14-2013, 04:11 AM   #1
Grinders Dad's Avatar
Join Date: May 2013
Location: Florida
Posts: 30
New Jeep upgrade

Hi all. Just purchased a new 2013 JK 2-dr with the 6sp and 3.73 with LSD. My soon to do upgrade will be the Old Man Emu 2" lift with the light springs as I will not add weight up front and want to retain the nice ride for DD use. I am going to upgrade the rubber to BFG AT radials and would like to use the 315-70-17's. I was told by the tire store they will fit the stock 17" alloy wheels, should i run spacers to prevent any contact? Will they even fit the stock wheel? How would the spare mount out back, do I need to mod the bracket to get it to fit?
Thanks for any help in advance, I'm sure this site will offer me much info and help in the future with my new ride.

Grinders Dad is offline   Quote Quick Reply
Old 05-14-2013, 04:45 AM   #2

WF Supporting Member
::WF Moderator::
kjeeper10's Avatar
Join Date: Feb 2011
Location: Connecticut
Posts: 35,386
You shouldn't have any issues. You will need spacers because of the factory backspacing.
At minimum $15 Daystar bumpstops for the spare. If you do plan on off road use, it's a good idea to reinforce the spare or a carrier.

2007 Rubicon/Rock Krawler triple rate 2.5" coils/RK rear TB w/ a teraflex raised bracket/Rancho 9000 31/32XL shocks/Synergy flipped draglink,ball joints,tie rod /Hankook MT 315-75-16 on Level 8 ZX's/Rancho geo brackets/Ruff stuff uppers/Fox ATS stabilizer/Adams front DS/Artec front armor w/ Currie upper bushings/Rancho cat back exhaust.

Lifting your JK? Read this!!

Click HERE to become a WranglerForum Supporting Member!
kjeeper10 is online now   Quote Quick Reply
Old 05-15-2013, 07:02 AM   #3
Grinders Dad's Avatar
Join Date: May 2013
Location: Florida
Posts: 30

With the above upgrades what kind of mpg loss would I expect, right now I'm getting around 20.5 mpg@ 70mph with the cruise on.
Grinders Dad is offline   Quote Quick Reply
Old 05-15-2013, 07:26 AM   #4
Join Date: May 2013
Posts: 136
Between the wheels and tires it will be a noticeable drop.
2004 IBM GTO (600rwhp) SOLD
2003 10th Anniversary KB Cobra (620rwhp) SOLD
2011 Harley Davidson FLHXSE2 SOLD
2009 Pontiac G8 GXP! Trade in...I'm sick
2013 Jeep Wrangler Unlimited Rubicon 10th Anniversary
10Anvil is offline   Quote Quick Reply
Old 05-15-2013, 07:33 AM   #5
bill9274's Avatar
Join Date: Sep 2012
Posts: 209
i did a 3.5" lift and 35's i went from an overall average of 17.5 to 16.1. So not a huge drop in mpg.
bill9274 is offline   Quote Quick Reply
Old 05-15-2013, 08:44 AM   #6
enjerhoo's Avatar
Join Date: May 2012
Location: Top of the Hill
Posts: 909

If you decide to go with the 315's please post back in a few weeks with your mileage reduction.

I'm going back and forth on a couple of wheel and tire combinations and yours is one that I am considering.

Congrats on the Jeep!

Black Forest Green 2012 JKU Sahara, Tinted Windows, Chromed Door Handles, Star Fab Door Stops, Brake controller, Poly Filled Speakers, Black Hole Mod, DIY Grill Inserts, Blinker Mod, Aries Front Bumper, Spyder Rear Bumper, 2" Rancho Lift, Quick Disconnects, 10K Warn Winch, Helix Air Compressor 315/70/17 Duratracs on 17x8.5 Warlords, IL-PU36, X-treme 9008 bulbs & PIAA's
enjerhoo is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Product

All times are GMT -5. The time now is 03:44 PM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC