Thermal bypass included. Size: 11" x 6" x 3/4". This is a Must for any truck that has a 68-RFE or Aisin AS69RC transmission in it. When it works it's great, but these thermostats have a problem with sticking in the bypass position which blocks the transmission fluid from flowing through the transmission cooler. Maximum Protection for Your Vehicle. Any thoughts, comments, or insights would surely be helpful. The LPD4739 trans cooler includes a thermal bypass. The AB60 transmission has a warmer/cooler on the side of it that takes engine coolant off at the heater supply hose near the firewall and returns the coolant to the heater return hose. WITH COLD WEATHER BYPASS KIT. Insufficient Flow. This thermal bypass is typically used in areas where the climate is much colder, and helps the fluid reach optimal operating temps before completely flowing through the system. Whats people lookup in this blog: Tru Cool Transmission Cooler Thermal Bypass ATS 68RFE / AS69RC Thermal Bypass Valve Up-Grade, w/ Billet Filter Coupler, 2013-2018 RAM 6.7L Cummins . Rapid-Coolâ¢ Transmission Oil Cooler Kit (696) by Hayden®. Bolts to the side of the transmission and the cooler lines connect to it. This is a stacked plate, low pressure drop unit. ... Air does not have as large of a thermal coefficient, so you need more surface area for air flow to accomplish the same amount of cooling. This premium transmission oil cooler features a unique plate and fin design, which is 33% more efficient than a comparable tube and fin design. For newer models with a 6L80 or 6L90 however (2014+), the transmission cooler lines utilize a built in thermostat that remains closed and does not flow to the cooler â¦ Cooler size: 8.5" x 22.75" x 1.25" The fittings on this cooler are 3/8" inverted flare. Twice the Cooling for Your Transmission. This is the offender behind the warm-running Allison condition in your â17-â19 GM HD: the factory transmission cooler thermal bypass valve. One of my transmission lines were leaking so I bought all new lines installed them and someone told me the stock cooler on side of block is known for leaking internally mixing the coolant/trans fluid and destroying the transmission so after some research I found a fleece coolant bypass kit that bypasses the cooler on â¦ Debris in the stock cooler bypass valve can cause it to jam the internal valve keeping it in recirculation mode. Heat is what kills an automatic transmission. In the case of the 4R100 itâs not a problem when it comes to flushing the cooler lines and cooler, because it bolts to the transmission and is separate from the lines. This is the ultimate cooler for heavy towing and is a must for heavy duty applications, including racing. Something to think about, GM builds this stuff with the tolerances set for a given temperature, changing the temp will change the clearances, don't fix something that isn't broken. We offer a Full Service Kit as well as Bypass Valve as a separate item (you will need to source your own service kit). Ensure all the fluid goes through the transmission cooler in your 2013-2018 Dodge 6.7L Cummins with the ATS 3100052392 Thermal Bypass Valve Upgrade. Check out our Thermal Cooler Bypass Valves below: Tru-Cool is the leader in low pressure drop, automatic transmission coolers, also known as LPD. Hey I have a few questions regarding the cooler on the side of block. For cold weather applications, use this LPD4739 with the thermal bypass. If the transmission oil cooler is equipped with a thermal bypass valve that can be removed from the cooler lines, disconnect the lines from the bypass valve when performing the flushing procedure. 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