Ok I have a x unlimited and I knew I'd upgrade axels so I didn't mind starting with something small, my question is since I know I'll be running 38 maybe bigger should I just go with 60s so I don't ever look back and wish I'd gone that big? And what companies should I look at?

 

I would suggest using the search function with the lack of information given and the fact your profile is not filled out.
Things like lift, wheeling style, budget will all come into play. If you are running a 2007-2010 JK with an automatic I would recommend not running over a 37" tire. At $15k+ for a set of axles I would want as much information as possible to make the right decision.

 

I would tell you if you are building this Jeep to wheel hard, and aren't afraid to hit the skinny pedal when needed, Go 60's. No matter how tough you build a 44,, it still has a weak pinion when geared at 5.13's, and torquing heavy tires . I personally went with the 60's because I believe in being over built and knew I would be stepping up to 38-40" tires. If you decide to go with 60's, I would recomend the 2 most used on the market, Currie or Dynatrac.

If you are not wheeling hard and just building a good looking jeep, then you will be safe with 44's and can buy some used to save the cash. Good luck!

 

I am coming from a 2000 F250 7.3 with 42s so I plan on building this to take the abuse I put that truck threw, I don't want to go 44s then wish I was stronger

 

Hey Dirtman why do you say no bigger than 37's for a 2007-2010 auto? Even regardless if you're running big axel's like the 60's?

 

It depends on how often and how hard you wheel...

in November I replaced my factory d30 and d44 with Dynatrac pro rock d44 up front and the Dynatrac d60 trail, I also regeared to 5.13 and added ARB lockers with RCV axles up front with synergy ball joints and Dynatrac axles in the rear.

its an amazing ride, it's a 4wdrive go kart, even with heavy bumpers, a fairly heavy tire carrier and a winch.

But can you justify spending somewhere between $13,000-$16,009 when your done with little stuff like new rims and tires, ARB compressor and possibly having to replace your front bumper with a stubby for more clearance?

 

Mostly cause the auto will spill its guts with a tire bigger than that

 

The 3.8 and the shitty gearing in the 4 speed auto does not realisticly provide enough power to turn tires bigger then 37".

 

I have seen plenty auto JKS running 40s reliably for years. Is it a shitty tranny yup sure is but if geared properly you should have no issues.

 

Oh, you can run 40's on a JK auto but the performance is terriable on the road even with 5.38 gears. If it were a dedicated trail rig running at least the rubicon transfer case off road it would be alright. A 5.0 atlas would be more optimal for it as well. Adding the extra weight of tons on an already heavy JKU makes things even worse with the low power output of the 3.8 motor.

You will be putting extra stress on the drivetrain and over time you will see issues.