GVWR, 16,500 lb. (7484 kg) (Silverado 4500 HD 4WD models require one of the following combinations: (1) (FTB) 7.5k front axle and (FTV) 7.5k front suspension and (FN1) 10k rear axle or (GL4) 11k rear axle and (GR3) 11k rear suspension. (2) (FTB) 7.5k front axle and (FTV) 7.5k front suspension and (HD1) 15k rear axle or (J27) 15.5k rear axle and one of the following rear suspensions: (GR4) 13.5k rear suspension, (FU7) 15.5k rear suspension, (91B) 13.5k LiquidSpring prep single volume rear suspension, (91C) 13.5k LiquidSpring prep stacked volume rear suspension, (91D) 15.5k LiquidSpring prep single volume rear suspension or (91E) 15.5k LiquidSpring prep stacked volume rear suspension.)
Wheelbase, 165" (419.1 cm), 84" CA (Requires (F0C) 49" axle to end of frame, (F0D) 63" axle to end of frame or (F0K) 91" axle to end of frame. Requires (PCJ) Vocational Specific Heavy Suspension Package, when ordering (FTA) 7,000 lb. Front axle/(FK6) 7,000 lb. Front suspension or (FTL) 8,000 lb. Front axle/(FSN) 8,000 lb. Front suspension or (FU7) 15,500 lb. rear suspension.)
Front axle, 7,500 lb., Dana Spicer 60-256, single-reduction, front driving
Front suspension, 7,500 lb. (3,402 kg) multi-leaf, includes shock absorbers