WFLNHB Ignition Coil DR-49 with D577 Integrated Module — Direct-Fit for GM Trucks & SUVs

WFLNHB Ignition Coil DR-49 with integrated Ignition Module D577 is a direct-fit replacement assembly engineered to restore reliable spark delivery for a wide range of GM trucks and SUVs from the mid-1990s to the mid-2000s.

If your vehicle is running rough, misfiring, or showing poor fuel economy due to a failing ignition coil or module, this WFLNHB assembly offers a ready-to-install swap that matches the original equipment form, fit, and most electrical connections. The unit is compatible with numerous Chevy, GMC, Pontiac, Oldsmobile and Fleetwood platforms and replaces several common OE and aftermarket part numbers so technicians and DIYers can find a suitable alternative quickly.

Which vehicles and part numbers will this unit replace?

This coil and module assembly is designed to cover many GM applications from 1995 through 2007, including full-size trucks, SUVs, vans and performance cars. It lists direct fitment for models such as Chevy Express, Silverado, Suburban, Camaro, Blazer, Astro, and Cadillac Escalade among others.

• Replaces DR-49, C1098, 5C1062, LX381, DR178 and more
• Fitment includes Chevy Express 1500/2500/3500 (1996–2007), Silverado 1500 (1999–2007)
• Also fits Chevy Astro, Blazer, C/K trucks, Suburban, G30 vans, Pontiac Firebird, Oldsmobile Bravada
• Check stamped part numbers and vehicle year/engine compatibility before ordering

How does this replacement coil improve driving performance?

Replacing a worn ignition coil/module can recover lost spark intensity and timing stability, which helps reduce misfires and rough idle. While replacement does not change engine tuning, restoring proper ignition components supports smoother acceleration and more consistent fuel burn.

• Restores proper secondary and primary ignition signals
• Reduces misfires that can trigger check engine lights
• Helps return throttle response and steady idling
• OEM-equivalent electrical connections for quick swap

What should I expect during installation and compatibility checks?

Installation is typically straightforward: disconnect battery, unbolt the old coil/module, unplug connectors and transfer any retained hardware. Verify the replacement’s part numbers and connector pinout match your vehicle to avoid surprises and ensure a secure electrical fit.

• Comes sealed and ready to install out of the box
• Standard hand tools needed; common shop installation time under one hour
• Confirm part numbers DR-49, C1098, D577 etc. against the old unit
• Inspect wiring harness and ground points for corrosion before fitting

What are the build quality and package contents?

The WFLNHB assembly is manufactured from high-grade materials meant to match or approximate OEM durability and thermal resistance. It ships as a single integrated ignition coil with the ignition module already attached, reducing parts handling and simplifying replacement.

• Includes 1 x ignition coil with ignition module pre-assembled
• Constructed for improved heat resistance and vibration durability
• Sealed packaging to protect terminals and housing during shipping
• Not a plug-and-play warranty claim; inspect fitment before installation

Who is this for: mechanics, fleet managers and informed DIYers who maintain late-90s to early-2000s GM trucks, vans and SUVs and need a cost-effective, direct-fit ignition coil/module replacement. If you’re servicing a Chevy Express, Silverado, Suburban, Astro, Blazer, Escalade, Camaro or similar model and your vehicle shows ignition-related symptoms, this WFLNHB DR-49/D577 unit is a practical replacement option — especially when cross-referencing the listed part numbers and verifying connector compatibility with your vehicle.