The truck currently has 235/75R15's on her. I'm not sure what size she ran stock. Here's my question....Is what she's running now a normal change that doesn't take any "modification" or has the truck been pretty jacked with to fit the tires/wheels? On top of that question is this one....could I change out the rears for 17" without any cutting/extending? Thanks in advance for the info!

 

Looks close to stock from here.
17" rims will fit no problem. It is the width and offset of the rim that can limit you as well as the width and height of the tire.
A good tire shop will test fit several tires and rims for you to get the look you are looking for.

 

Thanks for the input!