Camaro ABS Issue

Anyone have an idea to solve a ABS issue with aftermarket wheels? I have here a cust with a 2011 Camaro that has different front and rear overall diam, tire size. 24" wheels frt and 26" wheels rear. 29.5frt-31.5 rear. i tried disabling the rear vss in the tune under General speedo but it didnt work. the camaro are equal height all the way around from factory. Any Ideas :doh:

Anyone have an idea to solve a ABS issue with aftermarket wheels?
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Put the same height tires on all four or forget about ABS