Get every crank turning cleanly with the Standard Ignition Starter Drive SDN-247. The starter drive is the pinion-and-overrunning-clutch assembly that engages the engine's flywheel/flexplate ring gear to crank the engine, then overruns and disengages once the engine fires so the spinning ring gear can't drive the starter armature. It fits a range of GM cars and vans, including the 1986-1990 Chevrolet Astro (V6-4.3L), 1988-1990 GMC Safari (V6-4.3L), 1993 Cadillac Allante, Commercial Chassis, Eldorado, Fleetwood and Seville, 1993-1994 Chevrolet Camaro (V8-5.7L) and Pontiac Firebird (V8-5.7L), and the 1994 Buick Roadmaster, Cadillac DeVille, and Chevrolet Caprice — see the Buyer's Guide tab for the full list and engine codes.
- Direct-fit replacement: installs on the listed GM starter applications (V6-4.3L, V8-4.6L, V8-5.7L).
- Engages and overruns: the pinion meshes with the ring gear to crank, then freewheels once the engine starts.
- Serviceable component: lets you renew the drive without replacing the entire starter, where the starter is otherwise sound.
Signs the drive may need replacing: a grinding sound during start, the starter spinning while the engine won't crank, or the pinion failing to disengage. Diagnose the cause before replacing, since these symptoms can have other sources. Manufacturer part number SDN-247 (also SDN247).
