Search by number: 1998 Pontiac Trans Sport 3.4L 6 Cyl Alternator ProAmp 13720 $84.00 each OPTIONS: Valeo Unit ProAmp 8248-11 $147.00 each OPTIONS: Delco Unit CS144 Alt ProAmpN 8248-11N $182.00 each OPTIONS: Delco Unit CS144 Alt ProAmpN 13720N $224.00 each OPTIONS: Valeo Unit 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