Transmission: 4-Speed Automatic Transmission, 5-Speed Manual Transmission. When you remove the check valve tube trans fluid will drip from the trans line, so position your drip pan under there as well. 48re Transmission Guide & Information. Let the truck heat up to operating temp and check the trans fluid level on a level road or parking lot. 48re Transmission Cooler Line Diagram. Now you can remove the check valve side of the hose. So why on earth would you want to remove this? Total price: ~$35 for parts. Transmission cooler lines diagram. 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. Enjoy your new found peace of mind. Add more ATF +4 as needed.
Deleting the Transmission Check Valve. 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. 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. 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. Search for: Main Menu. 1 - 3/8" to 1/4" reducer coupling (NAPA part #3300X6X4). 1 - quick disconnect fitting (NAPA part #730-5027). 48re Transmission Coolers. Tighten up the flare end onto the coupler in the truck and push the quick connect side onto the radiator. How to change transmission cooler lines. The flow for the check valve portion we've removed is from radiator to transmission (the return line). Compliments of aim4squirrels @. Trans line hose is reinforced and rated for +150PSI, any less and the hose will eventually swell and split, (probably while you're driving) and then you'll lose fluid and overheat.
4l80e Transmission Parts Diagram. I suggest you leave it on the tool and just shove the disconnect tool straight down onto the radiator pipe. I find the large 15 quart Blitz pans can cover both drips in one pan and work well. The 7/8" wrench should fit on the check valve and the 3/4" should go on the silver connector on the the trans return line. Make sure you place a catch pan under the fitting before you disconnect it as trans fluid will start to drip from the radiator. 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. The nozzle will slide right into the hose and the band clamp will fit perfectly over the flat portion of the nozzle. 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. 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. This setup is also nice if you ever want to add an external cooler or filter to the trans return line. Just use the old check valve unit to judge length before you cut. Transmission cooler line size. 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. The new fittings will make the whole unit a little longer than the old one, so don't judge rubber tubing to rubber tubing when you cut. 3/4" open end wrench.
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. A failure of this type usually results in a rebuild to the tune of at least $1200 or more. Just remove the hose from the fittings via the hose clamps and place the cooler or filter unit in between the two couplings and pipe the hoses into your current couplings. Recheck all of the connections. Insert radiator side coupling and tighten down the hose clamp over the fitting's nozzle end. The coupler in the pic is just a simple 3/8" male-to-male coupler. Then remove the tool.
Sorry for the few out of focus pictures, my camera doesn't like to focus without a flash which was necessary for some pics. Guides & Information. The first pic is of the check valve as it sits in the stock truck in the transmission return line from the radiator. First we need 1 ft of hose.
The nozzle end will go into the hose and then you'll use the band clamps to secure it. 2 - hose clamps (NAPA part #5051212). I just bought this one and used a reducer they had in stock. Throw another hose clamp on the hose before inserting the radiator side coupling. The tip on the nozzle serves as a catch so that the band clamp (when tightened down) can't slide backward. The brass fitting might have corroded a bit so a shot of penetrating oil will help break it loose. It's the piece just above the tool. Here's a pic of it installed: Engage the emergency brake and start up the truck and put it in Neutral. 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. Well, if you have debris in your trans fluid from normal wear and tear, a common place for it to collect is in the check valve. Trans oil catch pan. Here's a pic of the check valve side brass fittings (you can see these assembled in the quick disconnect tool pic posted earlier. You'll notice the flow direction is marked on the old check valve itself. 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.
Parts fit for the following vehicle options. 1 ft of 3/8" ID trans cooler line (NAPA part #H1937). The large brass fitting contains the the check valve in question. This will allow the trans fluid pump to refill the Torque Converter so you don't bog and stall as you try to take off. Make sure it is 3/8" ID trans cooler line hose and nothing else! 3/8" quick disconnect tool.
Offers the wholesale prices for genuine 2001 Dodge Ram 1500 Regular Cab parts. You can then take a peek in the check valve side to see the check valve inside the fitting. After you remove the check valve line, turn it quick connect side down and let the trans fluid drip out. Notice it says DODGE/JEEP at the top: The parts guy said he could order a quick connect with a female end that might attached directly to the 3/8" nozzle without the reducer, but I wasn't going to wait a day for a "maybe fits" part. 1 - 3/8" to 3/8" male-to-male coupler (will research P/N). 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.
1 - 3/8" pipe thread to flare thread converter (will research P/N). A flat head screwdriver. A razor blade won't work because the trans line is reinforced with steel mesh to keep it from expanding. Crescent wrench for various metric fittings somewhere between 17mm and 21mm. Just stuff the replacement check valve fitting unit in one end of the hose, clamp it down with a hose clamp and hold it up to the old check valve line before you cut. You must be logged in to rate content!
Harbor Freight has them here. 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. Here's a pic of the NAPA trans line (I bought their last 3 feet, so they gave me the box): That hose was rated for 400PSI! Remember to measure twice and cut once! 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. The metal ones are so much faster than wrestling with a cheapo plastic circle that gets chewed up and thrown out.
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