EVIL ENERGY Transmission Torque Converter Oil Cooler Compatible with 2003-2009 Dodge Ram 2500 3500 5.9L L6 Diesel 68004317AA 5086946AA Steel Bracket

Why 5.9L Cummins Owners Upgrade This Cooler

The transmission torque converter oil cooler mounts to the side of the engine and uses engine coolant to manage transmission fluid temperature: it warms the fluid up quickly on cold starts in winter, then pre‑cools it before the fluid ever reaches the factory transmission cooler in summer or under load. Because it's a fluid‑to‑fluid heat exchanger, it moves heat far more efficiently than the factory air‑to‑oil cooler alone — which matters most in the exact situations that cause premature transmission wear on a 48RE‑equipped Ram: towing, hauling, hot climates, and stop‑and‑go city driving. Replacing a cracked or aging OEM unit with this cooler is one of the most cost‑effective ways to protect the transmission before a fluid‑contamination failure forces a full rebuild.

• Updated removable brass AN O‑ring fitting adapter, which is removeable, stronger and leakless. The 8AN Male Flare fitting size is the same with OEM, can be installed directly. The cooler body is made of aluminium alloy, and the bracket is steel.
• Trans Torque Converter Oil Cooler mounted to the side of the engine, it uses engine coolant to heat and or cool the trans fluid coming directly out of the transmission, winter it brings trans up to temp and in summer pre cools before the transmission cooler. Fluid to fluid heat exchanger is more efficient, more powerful.
• It is critically important to use care when installing the cooler lines to the cooler. Professional installation is highly recommended.

Vehicle Fitment for This EVIL ENERGY Transmission Torque Converter Oil Cooler

This transmission torque converter oil cooler is a direct‑fit replacement engineered specifically for 2003‑2009 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L L6 turbo‑diesel engine, across ST, SLT, Laramie, Sport, and TRX4 trims. It cross‑references factory OE part numbers 68253200AA, 68004317AA, 5086946AA, and 5086946AB. Always confirm your truck's exact year, trim, and original OE part number before ordering — 2010‑and‑newer Ram 2500/3500 trucks moved to the 6.7L Cummins and use a different cooler, so this part is not interchangeable with that generation.

Built to Solve the Problems Owners Actually Run Into

Leak‑Free Brass AN Fittings (No More Weeping Cooler Lines)

A common complaint with cheaper replacement coolers is fittings that seep at the connection point within a few months. This unit uses removable brass AN O‑ring fittings instead of pressed‑in barbs, so the seal is made with an O‑ring rather than thread sealant alone — it can be re‑torqued or re‑sealed without replacing the whole cooler. If you want to understand exactly how AN fittings create a leak‑free seal, EVIL ENERGY has a full breakdown of the fitting standard used across this cooler and the rest of our line.

True Direct‑Fit: 8AN Sizing Matches the Factory Line

The fitting size is 8AN male flare, matching the factory line diameter, so there's no cutting, flaring, or adapting factory hard lines to make this work — it installs in the stock location with the stock hose routing. This is the detail most buyers search for before purchasing, because a mismatched fitting size is the most common reason a "universal" transmission cooler gets returned.

Aluminum Core + Steel Bracket vs. the OEM Plastic Tank

The cooler body is aluminum alloy and the mounting bracket is steel — both materials that don't become brittle with age the way the factory plastic end‑tank does. That difference is the entire reason this part exists: it's built to outlast the failure mode that sends most of these trucks back to the shop.

Year‑Round Transmission Fluid Temperature Control

In winter, the engine coolant loop brings the transmission fluid up to operating temperature faster, reducing wear during cold starts. In summer or under tow, it pre‑cools the fluid before it reaches the main transmission cooler, reducing peak fluid temperature — the single biggest factor in automatic transmission longevity.

Why Buy This Cooler From EVIL ENERGY

This part is engineered to fix the actual failure point of the factory unit — plastic end tanks and barb fittings — rather than simply reproducing it in a cheaper form. If you're also refreshing other parts of your cooling or intake system on the same 5.9L Cummins, take a look at our matching cold air intake kit for the 5.9L Cummins. For trucks running a custom cooling setup, our universal tube‑and‑fin transmission oil cooler is a popular add‑on for extra cooling capacity beyond the factory location, and our EVIL ENERGY AN Fittings line covers adapters if you need to convert sizes anywhere in the cooler circuit. You can browse the full Transmission Oil Cooler Collection or our complete Cooler Kits if you're comparing options for your build.

Installation Notes

This cooler bolts into the factory mounting location using the included steel bracket and hardware. Because the lines carry both transmission fluid and engine coolant, care with torque and seal alignment on the brass fittings matters — over‑tightening can distort the O‑ring, while under‑tightening leaves a slow weep under pressure. Professional installation is strongly recommended if you haven't worked with AN‑style fittings before. If you have questions about your specific truck before or during installation, EVIL ENERGY's Customer Support Center can help confirm fitment and torque specs.

Brand Summary

Return Reasons

1. Quality Issues: Provide photos/videos; we cover return shipping.
2. Wrong Item Ordered: Buyer covers return shipping; email within 30 days.
3. Change of Mind: Buyer covers return shipping; email within 30 days.
4. Shipping Damage: Inspect packages; do not sign for damaged items.
5. Incorrect Item Shipped: Contact within 7 days.

Price Protection Policy

Effective from August 25, 2024. Price drops within 7 days of purchase can be claimed.

Disclaimer

EVIL ENERGY reserves the right to interpret, modify, or terminate this policy in accordance with applicable laws and regulations.

If you need further information or assistance, feel free to ask!