Frequently Asked Questions About Kenworth T680 Front Fenders & Acc.

Will these fenders fit my specific year model T680, and what about the differences between day cab and sleeper models?

Most aftermarket fenders for the T680 are designed to fit model years 2013-present, but there can be slight variations in mounting points between early and later models. Day cab and sleeper models use the same front fender design, so fitment is identical. However, always verify the specific part number matches your VIN year and check if your truck has any special configurations like wide-track front axles, which may require different fender brackets or extensions.

What's the actual difference between fiberglass and thermoplastic fenders, and which holds up better?

Fiberglass fenders are typically 20-30% less expensive but are more prone to cracking from stone impacts and require more prep work for painting. Thermoplastic (TPO) fenders cost more upfront but offer superior flexibility and impact resistance, especially in cold weather. They also come with a smoother finish that requires less prep work. For trucks running in harsh conditions or frequent off-road situations, thermoplastic fenders generally provide better long-term value despite the higher initial cost.

How difficult is the installation, and what tools or additional parts will I need?

Installation typically takes 2-3 hours per fender for someone with basic mechanical skills. You'll need standard hand tools, a drill with bits for any new mounting holes, and ideally a second person to help position the fender. Most fenders come with mounting hardware, but you may need to purchase fender brackets separately (usually $40-80 per side) if yours are damaged. Some installations require transferring existing mud flap hangers and light brackets from your old fenders.

Do aftermarket fenders come painted or primed, and what's involved in color matching?

Most aftermarket fenders come in black gel coat or primer finish only. For color matching, expect to pay $200-400 per fender for professional painting. Some suppliers offer pre-painted options for common Kenworth colors, but these typically add 2-3 weeks to delivery time and cost an additional $300-500 per fender. If painting yourself, thermoplastic fenders require adhesion promoter, while fiberglass fenders need standard automotive primer.

What about fender extensions and accessories - are they universal or model-specific?

Fender extensions and accessories like quarter fenders, splash guards, and mounting brackets are typically model-specific to the T680. Generic "universal" extensions rarely fit properly due to the T680's unique fender contours. When ordering extensions, specify whether you have single or dual rear wheels, as this affects the required width. Most quality extensions add 2-4 inches of coverage and should match your fender material for consistent appearance and flex characteristics.