what is the largest size of tires and ring and pinion i can go with Sahara dana 30 front dana 44 rear ? without having issues ?

 

From reading other ppl's post, the max gear for the Dana 30 is 5.13 with 35" tires. Some ppl get away with 37" tires with 5.13 gear (stick of course). most probably recommend to change the Dana 30 to something stronger if running bigger tires.

 

Since you shouldn't run different gear or tire sizes between the two differentials the front D30 is the minimum common denominator.

There are many of us with D30s running 35" MTs and there are some owners (but fewer) running 37s.

It really depends on where and how you drive. Applying a lot of torque to the axle particularly when the wheels are near fully turned or the suspension has a lot flex will place higher loads on the axles and drivetrain. These conditions tend to happen more often in rock crawling and deep mud and snow.

It can also happen in very loose sand (dunes) if you bury the wheels or have you the turned when you start moving. Although I am always searching for a good puddle, I mainly roam in desert.

If you are mindful of your D30 you can safely go a lot places. The bigger the tires the more mindful you need to be. Having a winch to get out of trouble is also helpful so you don't have to depend so much on the front axle for traction in difficult situations.

Mkjeep is running on a D30 with 37" Toyos which are very strong but heavy tires and he is located in a geography with plenty of gooey mud. He can provide some valuable input about the limitations of a D30.

 

like spinlock says

 

I am running 37's on mine with 5:13's, chromolys, cold forged 760x u joints with a Detriot true trac. As long as I drive with finesse I am okay but If I hammer down I know it will go boom!!!!!!!!!.

BTW, everything that has been upgraded above was done so after I broke it.

 

im running 5.13, 37s, arb locked. stock axles, i didnt buy into all the xtra stuff and have done just fine. i watch me peddle and what im doing. thats not to say the next time i go out i snap a u-joint, but has worked for me so far, but anything is bound to break, just a matter of when

if u have a heavy foot, then i would upgrade some parts. i have been through red clay mud, black florida mud, rocks, sand, dirt, trails with no problems

edit: i did upgrade to aftermarket driveshafts front and rear

 

I guess then to be in the safe side of tires, 33s are better

but what about the R&P, aren't 5.13s also too much for dana 30 ?

 

It may have been covered but the Dana 30 in your JK is a new version. It is similar to an older style Dana 44. There are many, many people running 5.13's on a Dana 30.