Search by number: 1989 Chevrolet P Series Trucks 7.4L 8 Cyl Alternator ProAmp 7977-11 $84.00 each OPTIONS: P32 Chassis Standard ProAmp 7802-11 $113.00 each OPTIONS: P42 Chassis ProAmp 7955-7 $137.00 each OPTIONS: P32 Chassis Option ProAmpN 7802-11N $103.00 each OPTIONS: P42 Chassis ProAmpN 7977-11N $110.00 each OPTIONS: P32 Chassis Standard Why is there more than one unit for my car? Look at the TECH SPECS when more than one unit is shown for your car. AMPS (ELECTRIC CAPACITY): must match you vehicle electric requirements. *** Call us if you are looking to increase your unit capacity! OE ALTERNATOR MANUFACTURER: It is recommended to match the Make of your alternator