Frequently Asked Questions About Freightliner FLT Cabover Transmission Coolers

What year models and specific FLT series are these transmission coolers compatible with?

These transmission coolers are designed for Freightliner FLT cabovers manufactured between 1984-1991, including the FLT86, FLT106, and FLT120 series. Always verify your specific model number and VIN before ordering, as some mid-year production changes may affect fitment. Check your existing cooler's part number or mounting bracket configuration to ensure compatibility.

How difficult is the installation process, and what tools do I need?

Installation typically takes 2-4 hours for someone with moderate mechanical experience. You'll need basic hand tools including metric and standard socket sets, line wrenches for the transmission lines, and a drain pan. The most challenging part is usually accessing the mounting bolts in tight spaces. We recommend having a second person help support the cooler during installation. New transmission fluid and replacement O-rings for the line connections are also necessary.

What's the difference between aluminum and copper/brass cooler options?

Aluminum coolers offer better heat dissipation and are lighter weight, making them ideal for heavy-duty applications. Copper/brass units are more traditional and often last longer in corrosive environments. Aluminum models typically provide 15-20% better cooling efficiency but may cost more upfront. Both materials work well, but aluminum is recommended for trucks running heavy loads or in hot climates.

How do I know if my transmission cooler needs replacement?

Common signs include transmission fluid leaks around the cooler connections, overheating warnings on your gauge, burnt smell from the transmission fluid, or visible damage like bent fins or corrosion. If your transmission temperature regularly exceeds 200 degrees Fahrenheit during normal operation, or if you notice pink fluid (coolant mixing with transmission fluid), immediate replacement is necessary to prevent transmission damage.

Will aftermarket coolers affect my warranty or require modifications?

Quality aftermarket coolers that meet OEM specifications should not affect any existing warranties. Most direct-fit replacements require no modifications and use the same mounting points and line connections as factory units. However, some high-capacity upgrades may require different line fittings or mounting brackets. Always confirm that the cooler meets or exceeds OEM cooling capacity ratings for your specific application.