Dieselsite 4WD ESOF Stainless Lines Kit - 1999-2004 Ford F-Series

Dieselsite ESOF Stainless Steel Vacuum Line Kit

If your ESOF (Electronic Shift On The Fly) 4WD system isn’t engaging properly, the problem is often not electrical — it’s vacuum-related. Over time, the factory rubber vacuum hoses dry rot, crack, or collapse, and the steel fittings at the hubs commonly rust and leak. Any vacuum loss prevents the hubs from locking correctly.

The Dieselsite ESOF Stainless Lines Kit permanently solves this issue by replacing the weak factory hoses and fittings with Teflon-lined stainless steel braided lines built to withstand heat, moisture, and corrosion.

🛠️ Why This Kit Works Better Than OEM:

• Replaces failure-prone rubber vacuum hoses

• Eliminates rusted, leaking factory steel fittings

• Teflon-lined stainless braided construction for long-term durability

• Maintains consistent vacuum for reliable hub engagement

• Designed specifically for ESOF-equipped Super Duty trucks

📏 Lift Height Options:

• Stock – 4.5" Lift

• 6" – 8" Lift

(Choose the correct length based on your suspension setup)

📦 What’s Included:

• Driver-side stainless vacuum hose

• Passenger-side stainless vacuum hose

• Teflon tape for installation

🚗 Fitment:

• 1999–2003 Ford 7.3L F-250 / F-350 Super Duty

• 1999–2004 Ford 5.4L F-250 / F-350 Super Duty

• 1999–2004 Ford V10 F-250 / F-350 Super Duty

• 2003–2004 Ford 6.0L F-250 / F-350 Super Duty

If your ESOF system is intermittent, slow to engage, or completely inoperative, this stainless line kit is one of the most effective and permanent fixes available. Built to outlast the truck and restore dependable 4WD operation.