Good Times said:
fitting 285's will require heavy trimming even with a 3" lift (you can't fit 285's w/o a lift too btw). Expect to remove the flaps guaranteed. Trimming requires removing a section of the front bumper (due to it clipping when you turn). Other areas are the frame which you can't do much about unless you want to cut into it (not recommended at all..). other areas to consider are the inner fender wall that will rub as well. The only true way to check is by test fitting the wheel and the tire.
Remember that each tire mfg and each wheel are different so test fit first before committing to anything.
I realize if anybody would know it's you, based on your own setup. But... I've tried finding info from anyone who's run this exact tire with a similar lift and haven't found anything. According to the manufacturer the BFG AT in 285/70R17 is the same diameter but _slightly_ narrower on the same width rim as the 285/75R16 (11.0 versus 11.4 inches on an 8" wheel).
http://www.bfgoodrichtires.com/assets/pdf/all_terrain_ta_kd.pdf
If you look at the vehicle pictured in the second post of this thread, although it doesn't specifiy, I'd guess those to be 285/75?16's on 16x8 wheels (I could be wrong) -- mudflaps look removed, but who knows what else. But, the original post said the lift would accomodate 33" tires.
I had the BFG 265/70R17's on my recently-traded-in '04 SE with a Daystar lift and had only occassional _very mild_ rubbing at full lock, full compression without any trimming and without even removing mudflaps. Those are listed as 1" smaller in diameter (0.5" smaller in radius) and 0.3" narrower (10.7" on 8" wheels versus 11.0" on 8" wheels) compared to the 285/70R17's.
So, the bottom line is, I have a hard time understanding why any significant trimming will be needed, assuming I change UCA's and remove mudflaps.
I don't understand what you mean by trimming the front bumper. I can sort of see trimming the front inner corner of the flair.
You're right, a test fit makes the most sense -- unfortunately no one in my town carries these sizes so they have to be ordered in. Also, it would be nice to have details ahead of time -- for example, If it turns out I can never get these to fit without a body lift then I might get that done at the same time. Or, alternatively, decide to blow off that size, stick with the 265/70R17's and not even spend the money on the UCA's. ARGH!
Once I (hopefully) get min to fit I'll post details. Again, I'm suprised I haven't found anything on this yet.
Thanks for the great advice!