1989 Peterbilt 377 Engine: 10.3L -6 DIESEL; With 72 In. Belt Outside Circumference; Position: Fan and Alternator;. 1990 Peterbilt 377 Engine: 10.3L -6 DIESEL; With 72 In. 1991 Peterbilt 377 Engine: 10.3L -6 DIESEL; With 72 In.
The Gates Serpentine Belt Fan and Alternator is an ideal addition for 1989-1992 Peterbilt 377 vehicles.
