Frequently Asked Questions About Peterbilt 352 Transmission Coolers

Will these transmission coolers fit my specific year Peterbilt 352?

Most aftermarket transmission coolers for the Peterbilt 352 are designed to fit models from 1969 through 1980. However, there can be variations depending on your specific engine configuration and whether you have a manual or automatic transmission. We recommend checking your existing cooler dimensions and mounting points before ordering. If you're unsure, contact us with your VIN and we'll help verify compatibility.

What's the installation difficulty level, and what tools will I need?

Installation typically takes 2-4 hours for someone with moderate mechanical experience. You'll need basic hand tools including wrenches, socket set, and screwdrivers. Most installations require draining the transmission fluid, removing the old cooler lines, mounting the new cooler (usually using existing bolt holes), and connecting new or existing transmission lines. Some models may require minor modifications to mounting brackets. Professional installation is recommended if you're not comfortable working with transmission systems.

How much cooling capacity do I need for my application?

For standard highway driving, a cooler with 15,000-20,000 BTU capacity is typically sufficient. If you're hauling heavy loads, operating in mountainous terrain, or running in hot climates, consider upgrading to a 25,000-30,000 BTU unit. Coolers with larger surface areas and more rows generally provide better cooling. Remember that oversizing won't hurt - extra cooling capacity simply means your transmission will run cooler under all conditions.

Are aluminum or copper/brass coolers better for my Peterbilt 352?

Both materials work well, but each has advantages. Aluminum coolers are lighter weight, resist corrosion better, and typically cost less. Copper/brass coolers offer superior heat transfer and are often more durable against road debris, but they're heavier and more expensive. For most applications, a quality aluminum cooler with reinforced tanks will provide excellent service life. If you operate in areas with heavy road salt or coastal environments, aluminum is the better choice.

Do I need to replace the transmission lines when installing a new cooler?

It's highly recommended to replace transmission lines during cooler installation, especially if your truck has over 100,000 miles. Old lines can have internal deterioration that isn't visible from the outside, potentially contaminating your new cooler. New steel braided or high-pressure rubber lines typically cost $30-60 and can prevent costly failures. Make sure to use transmission-rated lines that can handle the pressure and temperature requirements - standard fuel line is not adequate.