Hello, i wanted to know if anyone had any knowledge of whats the largest tire size that could be run on a 2001 Dodge Ram 1500 4x4 w/ the factory OFF-ROAD Pkg. and a 2" spring spacer level kit. I am currently running 315/70/17 Mickey Thompson MTZ's on the factory 17'' rims, they havent rubbed any part of wheel opening but do make contact with the control arms, at full turn. I am curious to see if i can run 37's with the current set up?or buy after market rims to help with spacing?
any help would be great. and if anyone has pics that would be great also.

 

You have basically four inches of lift over a stock truck. The suggested amount for 35's is five inches...... You could have a look at how much clearance you have with your current tires, and probably take a stab at how much larger you can go, but, don't forget to take into account the different backspacing, if you get different wheels.

Also, I wouldn't reduce backspacing too much.... maybe an inch, and even at that, you are going to be beating up on the hub/bearing units on the front axle.....

 

I tried to measure buy my current tires are pretty badly worn down, so its had to tell. I've seen a couple pics of guys with same year but 2500's and running 37's with no lift. I think that the off-road and the 2500 are about the same size, but not sure. Oh and just to clear it up, backspacing is what moves the tire out past the body, right?

 

Most Off Road edition trucks come with 4:10 gears. Your at the limit or past already of what the drive train can handle. The taller you go with the tire's, the more your going to destroy the tranny for one. Not to mention, it's going to be a dog as far as power goes.

 

You are correct about the backspacing. Its the distance between where the rims actually mount and the center of the rim.

 

backspacing is measured from the mounting surface, to the back side of the wheel.

 

Should i go to 4.56 gears with my current set up? or go lower if i plan on going to 37's? what else should be swapped to be 37'' ready?

 

so on the backspacing what is factory? a inch or two? or none? does adding more move the tire in or out?

 

Stock I think is 4.5 inches. Larger numbers moves the tire further into the wheel well. Smaller numbers move the tire out of the well. If you go with wider tires, you want less back spacing, else they will rub on turns.

 

oh ok gotcha.
i see you did the plenum plate kit, as so many have done, is that primarily preventative maint? or you get more hp out of it?