Well, here's a little write up to remove the tranny check valve in the return line to increase flow to the trans and hopefully remove a common failure point in the Dodge 46re transmission. Parts needed: 2 - 3/8" nozzle to pipe fitting (yes you need 2 of these! ) After you remove the check valve line, turn it quick connect side down and let the trans fluid drip out. 48re Transmission Coolers. Total price: ~$35 for parts. Make sure you place a catch pan under the fitting before you disconnect it as trans fluid will start to drip from the radiator. You'll notice the flow direction is marked on the old check valve itself. 46re transmission cooler lines diagram. Crescent wrench for various metric fittings somewhere between 17mm and 21mm. Deleting the Transmission Check Valve. The black band around the tool is actually a rubber band and assists you in closing and holding the tool around the pipe you are using it on.
Transmission Cooler Lines Gm
1 or 2 quarts ATF +4 trans fluid. The tip on the nozzle serves as a catch so that the band clamp (when tightened down) can't slide backward. So why on earth would you want to remove this? 48re Transmission Cooler Line Diagram. The reason that you can't use just the nozzle piece is because the coupler in the truck on the check valve side is a flare thread which is different from pipe thread. It's tiny and once you see it, you'll understand why it's a restriction to the system and how debris can accumulate there, especially is the tranny doesn't see a regular servicing. Let the truck heat up to operating temp and check the trans fluid level on a level road or parking lot. Here's a pic of the check valve side brass fittings (you can see these assembled in the quick disconnect tool pic posted earlier. Just use the old check valve unit to judge length before you cut. Here's the replacement hose completely assembled: 1 ft of trans tubing will probably be a little too long for the setup so you can use wire cutters to cut the trans tubing to size. The purpose of this check valve is to keep the Torque Converter filled with transmission fluid when the truck is off so the next time you start it, you can take off without waiting for the pump to fill the converter back up. Transmission cooler lines gm. Tools needed: 7/8" open end wrench. The first pic is of the check valve as it sits in the stock truck in the transmission return line from the radiator.
46Re Transmission Cooler Line Diagram
I find the large 15 quart Blitz pans can cover both drips in one pan and work well. The next pic is the connection on the radiator side: It is typically held on with a quick connect fitting and you will need to first pop off the safety connection with a flat head screw driver. Here's a pic of it installed: Engage the emergency brake and start up the truck and put it in Neutral. Then remove the tool. Parts fit for the following vehicle options. Transmission cooler hose lines. Throw another hose clamp on the hose before inserting the radiator side coupling.
Transmission Cooler Hose Lines
The nozzle end will go into the hose and then you'll use the band clamps to secure it. 1 - 3/8" pipe thread to flare thread converter (will research P/N). Recheck all of the connections. When this happens, the fluid flow can eventually stop and with no way to cool the internals of the transmission, it will overheat and die. Compliments of aim4squirrels @. You simply slide the disconnect tool over the trans cooler line on the radiator side with the flanges pointing toward the check valve and press the tool into the fitting and then pull the fitting and hose away from the radiator. This setup is also nice if you ever want to add an external cooler or filter to the trans return line. 3/8" quick disconnect tool. I suggest you leave it on the tool and just shove the disconnect tool straight down onto the radiator pipe. The flow for the check valve portion we've removed is from radiator to transmission (the return line). A flat head screwdriver. RTV should not be needed if you get the fittings tight, but won't hurt if you want to use it, just use sparingly on the threads and make sure it is highly oil resistant and can take at least 250 degress. NAPA part #05706B106).
46Re Transmission Cooler Lines Diagram
Sorry for the few out of focus pictures, my camera doesn't like to focus without a flash which was necessary for some pics. When you remove the check valve tube trans fluid will drip from the trans line, so position your drip pan under there as well. The large coupler was 7/8" on the outside, but the nozzle and flare pieces were 17mm (IIRC), so I just used a crescent wrench as I didn't have a larger metric wrench. I just bought this one and used a reducer they had in stock.
You must be logged in to rate content! Here's a pic of the 3 pieces that go onto the radiator side of the hose (I believe that coupler was 21mm on the outside): And here's a close up pic of the NAPA replacement Quick Connect fitting. Make sure it is 3/8" ID trans cooler line hose and nothing else! The replacement is a return line with no check valve that replaces the current line without hacking up any of the truck's trans lines or fittings. A quick disconnect tool can be used to remove the connection to the radiator, pictured here (the tool is in the middle of the pic): I prefer the metal disconnect tools to the plastic ones as the short plastic circular tools don't really get far enough into the quick connect fitting to release the spring loaded latches. Search for: Main Menu. The brass fitting might have corroded a bit so a shot of penetrating oil will help break it loose. It's a good idea to let the truck idle in neutral for about 10 seconds before taking off after the truck has sit for an extended length of time. Add more ATF +4 as needed.