if anyone could help me out id appreciate it. i have a 2006 2500 4WD CTD nad want to put at least 37s on it, and possibly going to 18in wheels. im curious as to what width i could goup toand what size lift 4 or the 6?

 

I am almost positive you need to run a 6in lift to fit 37's and probably want to go with a 9.5in wide rim.

 

hemi07, you are correct I have the fabtech 6 inch lift and I am running 37x 12.50 17's 0n stock rims. but if I bought a set from the aftermarket I would go with 9.5- 10 inch wheels, hope this helps, and welcome to the forum!!

 

I am running 8" with 37's I would like to run 8" wide wheels instead of the 10" I am currently running.