The aFe BladeRunner Transmission Oil Cooler Kit (part 46-80005) is an auxiliary automatic-transmission cooler for 2010-2012 Dodge/RAM trucks with the 6.7L Cummins L6 turbo-diesel. It uses a brazed all-aluminum stacked-plate construction that the manufacturer says offers greater efficiency and lower pressure drop than a standard tube-fin design. The manufacturer states it provides transmission temperature reductions of up to 30° F. That margin matters most when towing heavy loads, climbing grades, or running in hot climates, where the factory cooler can fall behind. The core is listed in the manufacturer's data as black-finished aluminum and steel. Owners on user forums commonly add a remote or auxiliary cooler alongside the factory unit, which is the role this kit is built for.
Owners on user forums report that the factory transmission lines are 1/2-inch, which matches the included oil hose. On one truck, the front line from the transmission runs to the cooler, and the line from the cooler returns to the back of the transmission. When a cooler is mounted remotely, forum members suggest running fluid through the aftermarket unit first and then through the factory cooler, which reduces the heat load on the radiator stack. Buyers who want a stock-look cooler upgrade on a 6.7 Ram 2500 or 3500 with an automatic should verify the plumbing sequence and fittings against the manufacturer's install sheet before refilling fluid.
The manufacturer lists this kit for automatic transmission only. Manual-transmission trucks are not covered by this part number.
The manufacturer's specifications list a filter and a coupler as included. The kit also includes a 1/2-inch oil hose and black-anodized AN-8 fittings for the connections.
Before you start, identify the two transmission cooler lines and confirm the hose and fittings match the 1/2-inch sizing owners have reported on factory lines. Check the manufacturer's install sheet for mounting and routing, and clearance around the front end. Owners on user forums suggest routing the transmission fluid through the new cooler before the factory cooler when the unit is mounted remotely. After installation, check every AN connection for leaks, confirm the transmission fluid level, and watch fluid temperatures during your first tow or hard drive. Confirm the final plumbing order and fluid level against the manufacturer's install sheet.
