contemplating putting either 40"s with 20" rims or 37" with 18" nit to mud grapplers for tires of course what do you guys think

 

it honesstly depends what you will be using them for.

 

I run 38's. My jeep used to run 37's, but I have enough lift/build to run 40's.

The difference between 37s and 38s in proper vehicle prep is surprisingly large. I rubbed everywhere with the 38's while my 37's cleared with no problem. I had trimming to do, bump stop adjustments and lift changes as well.

I don't know how your jeep is built, but if you wheel at all 40's will destroy all the stock components in your rig. I run dual D60's with my 38's. Also, 40's will require at least 6" of lift, or the complete elimination of uptravel on the front end. just make sure you are prepared for the entire committment needed for 40s. 37s are much easier.

Either way, your rig will be sweet!

 

thanks guys for the feed back i think i am going either 37' or 38's with a 4 inch lift
keep on jeeping i know i will once i have this bad boy all done

 

37s are most common just remember that if you have a flat or so you'll be able to borrow a spare from someone. Then with 38s. Plus 37s is the sweet spot.



See 37s oh so nice.

 

very true i just wanted to up myself a bit from my last jeep i was running 37' nitto mud grapplers with a 6 1/2 long arm

 

Idk my 2012 has a 3.5" rk lift and those 37" mud grapplers and is bigger than my friends 06 rubi 6" long arm with 36" SS iroks. So 37s is just fine. Not to big not to small