It can definitely be done. Obviously it hurts your ability to rotate tires, but overall its no different than running a taller tire in back. Just be careful not to stagger more than 1.5" or so, or you loose ABS.
Off the top of my head I couldn't remember any Impalas set up this way, but I know that new Vipers have 19" wheels in the back and 18" wheels in front.
Can't rotate tires runnin different ("staggered") but same diameter either. Not a big issue if the stance is right.
That's where I'm at right now with suspension/wheel decisions.
Gonna install extended rear arms (and driveshaft if necessary)
Gotta figure out desired ride height then spring choice to get the fender height right with the widest (non-tubbed) rear tire width and staggered (both width and diameter) wheels that'll run as close to the fender lip as possible without hitting the fender.
There's a few threads around on the subject. I ran 20/22's on my wagon when I had it, and the current owner is running 22/24's.
I've seen the 18/20 combo on someone's car here... I bet I could dig it up with a search. And I'll do that for Gene since he's helped me before, instead of saying "Go do a search!"
Based on some numbers I ran on stock GM setups while evaluating ABS reluctors, the ABS computer should tolerate up to + or - 5% total wheel/tire diameter mismatch and not throw a code. This is purely a paper analysis, so take it for what it's worth.
That is my best friends old car, from one of the links that I posted earlier, it was sometime ago and not exactly sure on the sizes of tires, but 18X8.5 in the front with 255/45/18's and 20X10's in the rear with 285/30's Sorry I can't remember it has been about 5 or 6 years now since he had them on there.
Springs are Hotchkis, Hotchkis extended arms, nothing was cut.
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