Frequently Asked Questions About Freightliner SD 108-122 Transmission Coolers

Will these transmission coolers fit my specific Freightliner SD model year?

These transmission coolers are designed to fit Freightliner SD 108, 114, and 122 models from 2019 to current production years. They are direct replacements for OEM part numbers A05-30883-001 and A05-30883-002. Always verify your truck's VIN and existing cooler part number before ordering, as some special configurations may require different units.

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

Aluminum coolers are lighter weight and offer good heat dissipation at a lower price point, typically lasting 5-7 years under normal conditions. Brass/copper coolers provide superior heat transfer and corrosion resistance, especially in harsh environments or heavy-duty applications, with an expected lifespan of 8-12 years. For severe duty cycles or frequent mountain driving, we recommend the brass/copper option despite the higher initial cost.

Can I install this transmission cooler myself, or do I need a shop?

Installation typically takes 2-3 hours for experienced mechanics. You'll need basic hand tools, a transmission fluid pump, and approximately 2-3 gallons of transmission fluid for the flush. The cooler mounts using existing brackets and requires disconnecting transmission lines, which can be challenging without proper line disconnect tools. Many customers successfully complete DIY installation, but if you're uncomfortable working with transmission lines or lack a safe way to lift the truck, professional installation is recommended.

How do I know if my transmission cooler needs replacement?

Common signs include transmission fluid in your coolant (appears as a pink or red tint), coolant in your transmission fluid (milky appearance), transmission overheating warnings, visible leaks at cooler connections, or physical damage like bent fins reducing airflow by more than 30%. During pre-trip inspections, check for oil residue around fittings and ensure fins are straight and clear of debris.

What size transmission cooler do I need for my application?

Standard 16-row coolers work well for typical highway applications and trucks under 80,000 lbs GVWR. For heavy haul, frequent stop-and-go driving, or operations in extreme temperatures, upgrade to a 20-row or 24-row cooler. Trucks with Allison 4500/4700 transmissions or those regularly pulling over 100,000 lbs should use the heavy-duty 24-row option with auxiliary cooling fans for optimal transmission life.