Fitting 40's
10-29-2014, 07:34 PM
#11
JK Enthusiast
Join Date: Aug 2011
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Fitting 40's and keeping it reliable on 40's are two different topics. There are many thread on this topic. It gets expensive quick.
Why do you want or think you need 40's? Many find they would be better suited with a reliable decently built rig on 35s.
Why do you want or think you need 40's? Many find they would be better suited with a reliable decently built rig on 35s.
10-31-2014, 05:44 AM
#12
JK Freak
Join Date: Oct 2012
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Go to jeeps website.
Email them and give them your vin number. Tell them you want a copy of your build sheet on your jeep. They'll send you all the info that you're jeep was built with from the factory. It's nice to have and useful.
Email them and give them your vin number. Tell them you want a copy of your build sheet on your jeep. They'll send you all the info that you're jeep was built with from the factory. It's nice to have and useful.
10-31-2014, 08:30 PM
#14
If you want a realistic answer, just no. There's no reason you should put 40s on a front d30 unless you're driving the Jeep on flat pavement. You'll need to regear and drop tons of money into strengthening your axles, and I doubt even that will be worth it if you do anymore than street driving. I plan on going 42-44s, but that's only after I get tons, stretch kit, and comp cut to accommodate them. Good luck though with whatever you decide, but just throwing 40s on what you have will unlikely work.
10-31-2014, 08:52 PM
#15
JK Jedi Master
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Sometime when you are seriously bored and have a few hours to waste, go up to the "What's In Our Shop" subforum and click on the Punisher build. Llootttttssssss of ego and drama, but if you're patient clicking pages you will find their experience with running 40's on a front d30. (first time taking in off pavement - pretty much what they were told very early in the thread and ignored...)
And if you haven't noticed, a lot of experienced guys are trying to talk you away from this. If you go forward with it, be sure you get a handle on all of the pitfalls and gotchas and have some kind of a plan in place.
11-01-2014, 03:36 AM
#16
12-03-2014, 06:10 PM
#17
JK Super Freak
40s is a whole different ball game if you plan top off road. I would take smaller steps and start with 35s. But before you do anything you should read up. Lots to learn. I am still learning.
12-03-2014, 08:18 PM
#19
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Not much new to say other than listen to what's been said already. I've got a dana 30 in the front and I'm running 35s just fine for now, but plan to upgrade the axle in the near future.
12-08-2014, 07:01 AM
#20
JK Newbie
Join Date: Jan 2012
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I'm new to jeeps and I would NEVER consider 40s...and I have a JKUR. I have 35s and I plan on going to 37s after my current tires wear out...I already have new shafts front and rear from carolina driveline and I have plans for a truss, gussets, ball joints, and new gears upgraded before I even think about going 37s. Good luck going with the 40s lol Just get the 35s. End of thread 
