When the oil cooler line connector fails on certain vehicles, the original manufacturer makes you buy an entire new assembly just to replace the failed piece. | Dorman Products - 800-617 : Transmission Cooler Line Quick Connector. TH-400 cooler line fitting size? Jump to Latest Follow Hey everyone! Enter your ride HERE to be a part September's Ride of the Month Challenge! 1 - 4 of 4 Posts. What are y'all doing for the fittings.| Transmission & Driveline. When I was prepping the radiator fittings they were the wrong ones. I knew it would have the wrong transmission fittings. | I bought the Performance Radiator for the 03 because it is all aluminum, it is going in my 2006. High performance applications like towing and high torque engines can build heat in the transmission and break down fluids. Transmission heat is the prime reason for tranny failure. Transmission coolers are a simple solution to help prolong transmission life. | Transmission Coolers, Lines, and Fittings. Two inches thick, they cool fluid as close to. They are perfect for use as an Oil Cooler, Transmission Cooler, or the Radiator/Heat Exchanger in a Water to Air Intercooler setup. These multipurpose radiators are designed to cool fluids in a wide variety of circumstances. Item #: CR-1024.| Oil, Transmission, or Water Radiator/Cooler, Black (Type 103) Description. BRASS COOLER LINE FITTINGS, Male 1/2" NPT to 1/2" Hose Barb. ALLISON ADAPTER FITTING, Adapts "LATE" ('03 -up) model bell housing to "EARLY" (pre-'03) model transmission lines. Edit-the fitting for the tubes are 1/2 - 20 inverted flare for 5/16 tube. See #4 in the Illustrated Parts List| The fittings at the end would be the stuff that come with preflared tubing from Vatozone. NOTE: Some 2003 Model years trucks require this fitting. Remove formatting.| New replacement GM transmission cooler fitting for the front bellhousing on 2004-2016 Allison LCT1000 transmissions. I'm getting some 1/2" x 20-to-AN6 adapters from Jeg's so that I can use my leftover AN6 hose and fittings to make new transmission cooler lines from the TH350 to the radiator. Just in case anyone else ever needs the same info and does a search on here the fitting size is 1/2" x 20 inverted flare fitting (brake system fitting).