B, C, and S-Series Conventional Cab; Rear Single Axle; Main Springs
1963-1968: GMC used different springs than Chevrolet. Refer to the SRI manuals as needed.
P-Series Forward Control Chassis; Rear Single Axle; Main Springs
RM and S-Series Forward Control School Bus Chassis; Rear Single Axle; Main Springs
C40 through C80
1960-1962
S50 through S70 School Bus Chassis
1960-1962
RM70 through RM85
1966-1973: True radius, bronze (RNG) eye leaf bushing springs with high (approx. 8") arch.