Frequently Asked Questions About International 9900/i/ix Transmission Coolers

What are the exact model years and configurations these transmission coolers fit?

These transmission coolers are designed specifically for International 9900, 9900i, and 9900ix models from 1998 through 2017. They're compatible with both automatic and manual transmissions, including Eaton Fuller, Allison, and ZF configurations. However, trucks with auxiliary transmission coolers or specialized vocational setups may require additional fittings or modifications. Always verify your specific VIN and transmission model before ordering to ensure proper fitment.

How difficult is the installation process, and what tools are required?

Installation typically takes 2-4 hours for experienced mechanics and 4-6 hours for DIY installers. You'll need basic hand tools, a transmission fluid pump, new transmission fluid (8-12 quarts), and new cooler lines if yours are worn. The most challenging part is accessing the mounting bolts behind the grille and properly routing the cooler lines. Many customers recommend having a second person help with positioning. Professional installation runs $200-400 depending on your location.

What's the difference between aluminum and copper/brass coolers for my 9900?

Aluminum coolers offer better heat dissipation (15-20% more efficient) and are lighter weight, but they're more susceptible to road debris damage and corrosion from road salt. Copper/brass units are more durable and easier to repair if damaged, but they're heavier and slightly less efficient at cooling. For severe duty applications or northern climates with heavy salt use, copper/brass is often preferred. For maximum cooling in hot climates or heavy towing, aluminum performs better.

Will upgrading my transmission cooler actually lower my trans temps?

Most customers report temperature drops of 20-40 degrees Fahrenheit after upgrading from stock coolers, especially when towing heavy loads or climbing grades. The stock coolers on pre-2008 models are particularly undersized. For best results, pair the upgraded cooler with fresh transmission fluid and a new filter. Keep in mind that ambient temperature, load weight, and driving conditions all affect results. Installing a transmission temperature gauge helps monitor the improvement.

Do these coolers come with mounting hardware and lines, or what else do I need to buy?

Most aftermarket transmission coolers include mounting brackets and hardware, but cooler lines are typically sold separately. You'll need approximately 8-10 feet of transmission cooler hose (check your specific model), four to six hose clamps, and transmission line fittings that match your transmission type. Some installers also recommend adding an inline filter for extra protection. Budget an additional $50-100 for these components if not included with your cooler.