TRANS UPGRADES FOR SEVERE DUTY
BD DIESEL DOUBLE STACK COOLER AND DEVIANT RACE PARTS ALLISON COOLER LINES
Transmission Cooler and Line Upgrades
Is your truck used primarily as a daily driver? Weekly towing workhorse? Or maybe a competition-only drag racer or sled puller? In any case, it’s certain that the automatic transmission used to transfer all of that horsepower and torque to the ground has undergone its fair share of abuse. Stop and go traffic, long steep mountain passes towing 15,000 pounds or hot, quick laps at the drag strip can all be extremely hard on a transmission and lead to hot fluid temperatures. In both stock and built transmissions, extreme fluid temperatures can lead to premature parts failure such as burnt clutches and fried torque converters, so keeping transmission fluid temperatures in a “safe zone” can pay dividends in the long run.
BD Diesel Double Stack Transmission Cooler
The newest transmission cooler system from BD Diesel of Abbottsford, British Columbia, Canada, should fill a large void in the performance diesel market, offering a completely universal system for both daily driver and weekend tow rigs, along with full competition-only drag and sled pull trucks. Using their already popular Xtruded core design from their air-to-air intercoolers, the Double Stack Xtrude transmission cooler comes complete with a 800-cfm electric fan, wiring harness, hoses, fittings and universal mount brackets. The unique stacked design allows for the use of two identical coolers to be mounted in a relatively compact system for maximum cooling surface in a minimum space. The electric fan kit is wired into the system to be triggered on/off as needed, based on transmission temperature, offering excellent cooling even at low speeds when consistent outside airflow across the coolers doesn’t exist.
The universal brackets supplied by BD allow endless mounting options to fit any vehicle’s specific requirements. While most will find the space needed under the truck inside the
frame rails, the coolers could also be mounted inside the truck bed on drag race and sled pull applications. With more than 260 square inches of surface area and 40,000-btu/hr cooling capacity, the Double Stack cooler can offer up to a 350% temperature drop compared to a stock cooler, according to BD. BD claims their Micro Extruded bar technology offers efficient airflow across the core and turbulent oil flow inside, which offers the best cooling characteristics. The 5/8-inch inlet and outlet offers maximum flow with little restriction to fluid flow and ensure a leak-free connection tested to 300-psi of pressure.
Deviant Race Parts Allison Replacement Cooler Lines
Since the factory GM Allison transmission lines are prone to failure and leaking after racking up thousands of miles of on- and offroad abuse, Deviant Race Parts, an affiliation of Alligator Performance Diesel, developed their own resolution with a complete replacement performance hose kit. Using your choice of either ½- or 5/8-inch extremely heavy-duty 2,325psi rated hose and the required fittings to connect your Allison to the factory cooler, leaks can be a thing of the past. Using quality An-style fittings with O-ring and washer style junctions, once installed and secured, your stock or built Allison can keep moving your truck down the road worry free. DRP offers kits for 2001-05, 2006-10, 2011-14 and 2015-16 Duramax/allisonequipped trucks, and while they’re designed to install directly to the stock fluid cooler, they can also be used with some aftermarket coolers depending on their mounting location and fitting sizes.
By running the larger high-volume 5/8-inch cooler line repair kit from DRP and mounting the new BD Diesel Double Stack cooler in the factory location (custom mount brackets had to
be fabricated to do this) the two kits matched right up together and made for a relatively easy install that was completed in just one day out in the garage. It should be noted that, while the installation of the replacement cooler lines is fairly straightforward, be prepared to make a mess on the shop floor. Dropping a tarp under the truck may help, but with oil being trapped inside the factory cooler lines, when it comes time to remove the lines all together you may cause some fluid to be lost and spilled all over the place. Unfortunately, there just may be no way to get around the messiness of this job.