Picture this: you’re cruising down a muddy backroad, ready to switch into 4WD, and nothing happens. You check your ESOF switch, slam it again… still nothing. The culprit? Not your transfer case, not your drive shafts—it’s the OEM vacuum hoses and steel fittings at your hubs, silently failing after years of exposure to heat, moisture, and road grime. Dry-rot, leaks, and rusted fittings strike when you least expect it, leaving you stuck and frustrated.

Enter the DIESELSITE 4WD ESOF Stainless Lines Kit—engineered to prevent this nightmare. Designed for 1999–2010 Ford Superduty models, this kit replaces those old, failing rubber hoses and rusty steel fittings with Teflon-lined, stainless steel braided lines that outperform OEM parts in every way. Whether you’re battling mud, snow, or the daily grind, these lines keep your 4WD system reliable and responsive every time you flip that switch.

Why We Like DIESELSITE

Finding high-end diesel performance parts starts with a visit to DieselSite. Whether you’re shopping for Ford PowerStroke transmission components or heavy-duty 4WD stainless lines, DieselSite brings quality, innovation, and real-world testing to every product.

They don’t just sell parts—they use them, test them, and refine them. With diesel in their veins, the DieselSite team solves real-world truck problems with rugged solutions you can trust. Family-owned and operated, their mission is simple: build parts that last and keep you on the road with confidence. People across the country rely on DieselSite because they know they’re getting performance and longevity far beyond OEM standards.

Why Upgrade to This Kit?

• Teflon-lined, stainless steel braided lines resist corrosion and cracking
• Significantly stronger and more durable than OEM hoses and fittings
• Designed for 1999–2010 Ford Superduty F250 & F350 models
• Easy, direct-fit installation with included Teflon tape
• DieselSite engineered, tested, and backed by real-world use