Frequently Asked Questions About International 9300/9370 Transmission Coolers

Will these transmission coolers fit my specific International 9300 or 9370 model year?

Most aftermarket transmission coolers for International 9300/9370 trucks are designed to fit models from 1987 through 2007. However, there can be variations based on your specific engine configuration (Cat C12, C15, Cummins ISX, Detroit Series 60) and whether you have a manual or automatic transmission. Always verify the cooler specifications match your truck's VIN details, particularly the transmission model number, before ordering.

What's the typical installation time and difficulty level for these transmission coolers?

Professional installation typically takes 2-4 hours depending on your truck's configuration. The job requires draining transmission fluid, removing existing cooler lines, mounting the new cooler (usually to the radiator support), and running new hydraulic lines. Common challenges include accessing tight spaces behind the bumper and ensuring proper clearance from other components. Most installations require basic hand tools, line wrenches, and possibly minor bracket modifications.

What's the difference between tube-and-fin versus plate-and-fin cooler designs?

Tube-and-fin coolers are generally more affordable and adequate for standard highway driving conditions. Plate-and-fin coolers offer 25-40% better cooling efficiency and are recommended for heavy-duty applications like hauling oversized loads, mountain driving, or hot climate operation. The plate-and-fin design also typically features more robust aluminum construction that better resists road debris damage.

How do I know if I need to upgrade my transmission cooler?

Key indicators include transmission temperatures consistently exceeding 200?F during normal operation, burnt transmission fluid smell, slipping gears, or frequent transmission-related warning lights. If you've increased your truck's power output, regularly haul maximum loads, or operate in extreme temperatures, an upgraded cooler is strongly recommended. Factory coolers often struggle with these demanding conditions, leading to premature transmission wear.

What size transmission cooler lines and fittings do these coolers use?

Most International 9300/9370 transmission coolers use -8 AN (1/2 inch) or -10 AN (5/8 inch) fittings, though this varies by transmission type. Allison automatic transmissions typically use -8 AN fittings, while Eaton manual transmissions may use -6 AN or -8 AN. Always confirm your existing line sizes before ordering. Many cooler kits include adapter fittings, but purchasing the correct size initially prevents installation delays and potential leaks.