I agree I have not seen any worn out due to tire size changes and I work on them every day. GM could deny warranty on them but most dealers would not, providing your not lifted with 40" or bigger tires. We have probably installed 30 or more sets of 20 and 22" wheels and tires in the last year with no problems other than slightly accellerated wear on idler, pitman and tie rods.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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