biggest tire size i can fit under my truck with 20 inch rim. also would like to know about on a 15 and 16 inch rim as well. i have a 2001 dodge ram 1500 slt 2wd. i know its posted alot but i couldnt find it in previous posts. please help me out with all three sizes FOR SURE if u can

 

That's one question I can't help you with. Have 35's on mine, but it's a 4x4. 2 wheel no good here in Pa and also having a snow plow on the truck

 

I had 275/60R/20's and they rubbed. I have 285's on a 16 inch rim now and they just about rub.. I have a 4x4 so yours being 4x2 i would expect that you probably wouldnt be able to get away with either size without some major rubbing.. I could be wrong though... Wait for some 2 wheel drive guys to chime in.

 

anyone know where i can get a cheap 3-4 inch lift from for my truck? also would like to know about a leveling kit. and yes, i know it's a two wheel drive but i still want to do it...

 

mine is a 4x2 and its leveled, a 2" kit and it sits perfectly level (although this appears like its sagging in the back) i would recommend a coil spring spacer (leveling kit) in the front and maybe some small blocks in the back....or maybe if you could find a small add-a-leaf??

 

get a 2" level for the front and you can should be able to run 285/75/16's or 275/60/20 without rub.

265/75/16 with no lift and should be able to fit a 275/55/20(you might notice some slight rubbing with this size if your front springs have some sagging)

with 15" rims stick to a 31

 

I bought the "cheap" lift for my truck and have regretted it ever since.
For the cost of having the Tuff Country 4.5 in. lift installed I could have bought a higher quality one that wasn't spacers and blocks and installed it myself. Some things were overlooked on the install and I've already had to replaced one bushing in the new radius arms and about to have change another one.
I've learned my lesson on getting what you pay for.
As far as tires I'd bet 33's would be about it stock.