Mack RD Truck Hoods & Related

Frequently Asked Questions About Mack RD Truck Hoods & Related

Will these hoods fit my specific Mack RD model year, and what are the differences between RD688, RD690, and RD600 series hoods?

Mack RD hoods are generally compatible across RD600, RD688, and RD690 models from 1988-2004, but there are important distinctions. The main difference is in the grille mounting points and headlight configurations. RD688 and RD690 hoods are typically interchangeable, while RD600 models (pre-1995) may have different mounting brackets. Always verify your VIN and model year before ordering, as some mid-year production changes occurred. We recommend checking your existing hood's part number or contacting us with your truck's VIN for exact fitment confirmation.

What's the actual weight difference between fiberglass and OEM steel hoods, and how difficult is the installation?

Fiberglass aftermarket hoods typically weigh 65-85 pounds, while OEM steel hoods weigh 150-180 pounds. This weight reduction improves fuel economy and makes installation manageable with two people. Installation usually takes 3-4 hours and requires basic tools: socket set, torque wrench, and potentially new hood hinges if upgrading from steel. The main challenges include aligning the hood properly (expect 30-45 minutes of adjustment), ensuring proper gaps around fenders, and transferring grille components. Most customers report needing to drill 2-4 mounting holes for accessories like mirrors or antennas.

How durable are aftermarket fiberglass hoods compared to OEM, and what about paint adhesion issues?

Quality aftermarket fiberglass hoods use hand-laid fiberglass with gel coat finish, offering excellent durability for 10-15 years with proper care. They resist rust and handle minor impacts better than steel but can crack under severe impact. For painting, the surface must be properly prepped with 220-grit sanding and adhesion promoter. Common issues include spider cracking after 5-7 years in extreme climates. We recommend using automotive-grade primer and allowing 72 hours cure time before installation. Most professional painters charge $400-800 for proper prep and paint.

What styles and aerodynamic options are available, and do they actually improve fuel economy?

Available styles include standard flat-top, curved aerodynamic, and raised-roof designs. Aerodynamic hoods with integrated bug deflectors can improve fuel economy by 3-5% at highway speeds according to customer feedback. Popular options include single or dual air intake cutouts, integrated CB antenna mounts, and pre-drilled marker light holes. The curved aero hoods add approximately 6 inches of height and work best with trucks running consistent highway miles. Standard flat hoods maintain original appearance and are preferred for vocational applications.

What additional parts typically need replacement when installing a new hood, and what's the real total cost?

Beyond the hood itself, commonly needed parts include: hood hinges ($150-250 per set), rubber hood bumpers ($20-40 set), hood latch assembly ($75-125), and weather stripping ($50-75). If converting from steel to fiberglass, new gas struts ($80-120 pair) are recommended due to weight difference. Grille mounting brackets sometimes need modification ($50-100 in parts). Total project cost including hood, parts, and professional paint typically runs $2,500-3,500. Budget an extra $200-300 for unexpected brackets or hardware, especially on trucks with aftermarket accessories.