Frequently Asked Questions About International LoneStar Transmission Coolers

Will these transmission coolers fit my specific year International LoneStar, and are there different sizes available?

Our transmission coolers are designed to fit International LoneStar models from 2009 through 2023. We carry multiple sizes ranging from 11" x 8" plate-style coolers to larger 24" x 13" heavy-duty units. The most common fitment is the 16" x 10" cooler which works with both manual and automatic transmissions. Always verify your existing cooler dimensions or check your VIN-specific requirements before ordering, as some engine configurations may require specific sizes.

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

Installation typically takes 2-3 hours for someone with moderate mechanical experience. You'll need basic hand tools including wrenches, a drain pan, and potentially a transmission line cutter. Most coolers come with mounting brackets and hardware, but you may need to purchase transmission fluid (usually 1-2 quarts extra), new transmission lines if yours are corroded, and line fittings specific to your truck's year. Professional installation runs $150-300 if you prefer not to DIY.

What's the difference between aluminum and copper-brass coolers, and which performs better for heavy hauling?

Aluminum coolers are lighter (typically 40% less weight) and provide excellent cooling for standard applications, while copper-brass units offer superior heat dissipation for extreme conditions. For heavy hauling or mountainous terrain, copper-brass coolers can lower transmission temps by an additional 15-20 degrees compared to aluminum. However, copper-brass units cost 30-50% more and may develop green patina over time. Most drivers find aluminum sufficient unless regularly hauling maximum loads.

How do I know if my transmission cooler needs replacement, and what are the warning signs?

Key indicators include transmission fluid in your radiator coolant (appears milky), external leaks around cooler connections, transmission overheating warnings, or slipping gears after highway driving. Physical inspection may reveal bent fins, corrosion, or impact damage. If your transmission temps regularly exceed 200?F during normal driving or you notice a 20+ degree increase from previous readings, replacement is recommended. Coolers typically last 150,000-200,000 miles under normal conditions.

Can I add an auxiliary cooler instead of replacing the factory unit, and what size do I need?

Yes, auxiliary coolers can be added in series with your existing cooler for extra cooling capacity. For standard applications, a 12" x 8" auxiliary unit provides adequate supplemental cooling. Heavy haulers should consider 16" x 10" or larger. Mount the auxiliary cooler in front of the radiator with at least 1" clearance for airflow. This setup can reduce transmission temps by 30-40 degrees and is especially beneficial for trucks with engine tuning modifications or those pulling heavy loads in hot climates.