It's been a while......

[nubuilder]

The 285's will fit and you may need to crank a bit. You can run 33's but they will be stuffed and you will need to crank or they will rub.

Here's a RC 3" lift so that you can run 33's. http://www.roughcountry.com/chevy_4wd_88-98_2-3.html

I will probably get this lift in the future so that I can still fit it in the garage.

A 3" suspension lift doesn't sound bad. I wonder how it would look on stock rims (in terms of backspacing) since most guys run a tire that has less backspace with a lift.

Tyler, do you know of any pics of trucks at stock height running 285/70R17's?

265/75R16 (stock size) is 31.6" in diameter
285/70R17 is 32.7

Will the 1.1" difference make that big of a difference for clearance?

I'll see if I can dig up some pics and pm them to you but they will easily fit cranked level.
285/75/16's fit easily with the fenders level and the 285/70/17's are the same radius and diameter so there isn't any difference except the rim size.

Edit: The only thing that may make them rub is the backspacing of the rim but since the 17's you got are factory wheels they should work fine.

My truck must already be cranked then because it sits pretty level. I don't know if they came from the factory or not, but I don't have a block in the rear.

Cool! Then if I decide to go with that size I know they'll fit!

 

[KTMracer]

that is definately one nice looking truck