Keep spark reaching the right cylinder in the correct firing order with the ThunderSpark Distributor Cap 925-1071, an OE-replacement cap for vehicles with conventional distributor-based ignition. It directs high-voltage current from the ignition coil through the rotor and internal terminals to each spark plug. It drops in as a direct-fit replacement across a wide range of GM trucks and vans, including the 1996-2005 Chevrolet Astro, 1995-2005 Chevrolet Blazer, 1995-2004 Chevrolet S10, 1999-2007 Chevrolet Silverado 1500, 1994-2005 GMC Jimmy, 1996-2008 GMC Savana 1500, 1999-2008 GMC Sierra 1500, 1997-2000 Isuzu Hombre, and 1996-2001 Oldsmobile Bravada — see the Buyer's Guide tab for the full list and engine details.
- Directs High-Voltage Spark: Routes ignition coil output to the correct cylinder for proper firing order.
- OE-Replacement Quality: Built to meet OE specs for terminal alignment, dielectric strength, and conductive path.
- Heat-Resistant Materials: Made with high-dielectric compounds to withstand high voltage, thermal cycling, and engine vibration.
- Exact OE Fit: Designed to install into the original distributor housing and maintain secure contact with the rotor and ignition wires.
Over time a distributor cap can develop carbon tracking, cracks, or corrosion. Signs it may need replacing include misfires, hard starting, and rough drivability. If a worn or cracked cap is the cause, this replaces it and helps restore consistent spark delivery.
Interchange: 33-7044
337044 · D321A · 5D1078 · C280 · C280P · DC20009 · 40006A · 10452458 · DR475 · DR475T · DR978
This part cross-references / interchanges with the following part numbers:
D321A, 5D1078, C280, C280P, DC20009, 40006A, 10452458, 33-7044, DR475, DR475T, DR978
