you should be able to run a 33 on stock wheels with no problem
265 75 16
20" tires are the largest tires for your car if you of course don't have any lift kits..
32.5x10
not a chance you will def need a lift
You can go as large as 31" tires without having to lift it.
No, with a 3" body lift on a 03 sierra you can only clear like 32" or 33" and they'd rub a little bit. Speaking from experience on this one.
I have 31 x 10.5" BF Goodrich T/A KO tires. They are considered the largest tires you can fit without a lift. They rubbed a bit during sharp turns until I installed a 2" Tuff Country lift.
33x12.50
31" tires with no lift required, if you are planning on going "off road" consider at least a 1" body lift or shakle lift
It will be the same as it would be stock !!!
replace a window lift motor for a 2002 gmc sierra?
Yes it would fit but you might need to fender trim a little bit, it also depends on how wide the tires are they might scrub on the front sway bar.