I have an 07 Silverado (new body).  Lowered 2/4, I want to lower the front another 1" with 265's, 285's in the rear.  I was told that the abs system could possibly struggle with different tire sizes front to rear, anyone know for sure?  

if the diameter of the tires are within a 1/2 inch it might be ok but if the tires r more than that it may throw a lite on the dash, or every time u hit the brakes it may kick the ABS on  

I received post from someone with a 99-06 style Silverado, who has been running a 2" differential tire height front to rear for a year (30 front,32 rear)with now adverse affects.  Does anyone know if the new Silverado abs system is radically different from the 06?  Is anyone else running the retro look on the new Silverado?  

yes very different im running same size tires but changed axle ratio 342 to 390 and sets abs light on with in 3 miles brakes still work just abs will not  

I've heard that the new size will make the brakes feel jittery or do somthing weird when braking. I also heard you can take it to a dealership and get it fixed easily!  

Tire/wheel size won't effect the ABS.