I'm looking to upgrade my TV and have two trucks that are the same expect the trans. & diff. in mind. one is a 2009 Chev with 5.3, 4 speed trans. 3:73 diff. the other is a 2010 Chev with 5.3, 6 spee...
You will want GU6 for 3.42 axle and Z82 for HD Towing package. Z85 is suspension, standard or towing, not the Off-road Z71. KNP is specifically the one you want, HD aux trans cooler. Included with Z82.