Description: Bravada/Envoy/Trailblazer. 129 wheelbase. With long wheel base. With 4.10 ratio. Without active brake control. With limited slip. With short wheel base. Bravada/Envoy/Trailblazer. 113 wheelbase. Rainier. Manual trans. SSR. Integrally molded - friction material molded to backing plate for bond integrity Premium shims, slots, and chamfers help to diminish noise, vibration, and braking harshness This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors