Application : GMC C3500 Accessory Drive Belt. Part Type : Accessory Drive Belt. 1980 GMC C3500 5.7L; GAS; Without A/C; With Hydroboost; Location: Fan and Hydraulic Pump;. Due to thermal forces in the vehicle engine, this variable notched belt tightens on the drive as it heats up to prevent slippage, improve belt performance and reduce noise.
