Flex-a-lite Translife Direct Fit Transmission Cooler Installation - 2008 GMC Yukon

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How to Install the Flex-a-lite Translife Direct Fit Transmission Cooler on a 2008 GMC Yukon


Today on our 2008 GMC Yukon Denali, were going to take a look at and show you how to install the Flex-a-lite Translife Direct-fit Transmission Cooler. This is a Class 3 Tube and Fin style cooler with barbed fittings. This part number is FLX4118GMT. All right. Now, heres a good comparison look of our aftermarket cooler versus our factory cooler. As you can see our factory cooler does a decent job of helping to cool the transmission, but this is just better.

You can see its going to have a much larger surface area. Thats going to give us a lot more area to dissipate that heat. This is going to lead to less heat buildup in the transmission which is going to help to extend the life, especially when towing. Now, with the factory transmission cooler in place, we do need to remove this. If you dont have a factory transmission cooler in place, well, this should go right in. You can see the brackets are designed to mate up with these bars that run down each side here to give us a perfect fit.

Now, heres what our cooler kits going to look like when you pull it out of the box. Its going to be a really nice, custom application. This is going to work for GM trucks and SUVs anywhere from 1999 up to 2012, and thats going to be with or without a transmission cooler. This is going to be about 14 7/8" by about 7 1/2". This is a tube and fin style cooler, so our fluids going to enter here, and it runs around this tube back and forth.

The copper and also the fins are going to help dissipate all of that heat. This is going to extend the life and longevity of our transmission. These are the custom-made brackets designed to bolt right onto our cooler, and then align right with the bracing on our vehicle. Of course, were going to have all the hardware and everything we need to get it put together. Even some in-line fittings here. If you have a transmission cooler already installed, youre not going to be using these.

If you dont, you will be. Its a really easy process to get this put in. Lets get started on it. Now, to begin our installation, were going to pull the front fascia off of our GMC here. Its really a pretty simple process. Were going to start here on the top. We need to remove these three bolts, one, two, and three using a 10-mm socket. Were going to do that on the drivers side and passengers side. Right underneath the bumper here were going to have these two tabs that come back. These are going to have 7-mm bolts in them. Lets get those backed out. Now, we have our last 7-mm right there to get taken out. That Push Pin fastener there may separate and thats fine. Get that done over on the passenger's side too. On our wheel well area, were going to take out the 7-mm bolts here, right up here. We can also remove our Push Pin fasteners here. Weve got one, two, and three. Either a screwdriver or a trim panel removal tool will do a good job at that. All right. Now well go do that same thing over on the drivers side. Now, were going to get an extra set of hands, and we want to start on each corner. Right here where the fascia meets the fender we want to pull out away from the vehicle. Just like that. We're going to have these two tabs that are going to click. Once weve got those clicked out. Now, we'll separate any electrical connections as we go here. Weve got just this little pushpin right here that'll allow us to take this plug out of the back of the fog light. It looks like here thats all well have, but definitely check yours out and make sure. Now, we'll set our fascia aside somewhere nice and safe. Now, to do our pre-assembly were going to take one of our bolts. We want to pass it through one of our holders. This is a really neat mounting system. It allows us to put that right around our fin. Now, on the backside were going to put another one. Just want that rounded side to be out. You can see it kind of matches the curvature of the tube itself. Once weve got that on, black plastic spacer, were going to put on a washer. Lets get that started at all four corners now. Now we can bring one of our brackets in. Place that on and add another washer. Then our nylon lock nuts are going to thread right down on top of there. Do the same thing for other side here. We can use a couple of 7/16 here, and get our nylon lock nuts tightened down. Now, lets go take a look at our truck. Thats what our cooler's going to look like pre-assembled. We're going to get our lines separated here so we can get this cooler out of the way. Right in this well down here its going to be a good idea to stuff some shop towels down in there. We want to catch any fluid that might come out of here. You also want to have a bag, or a box, or something like that to put your cooler in. That way it doesnt leak all over your garage. Then we're going to pull down on the plastic clips that are on each line. Just like that. We need to pull out these small silver clips. Something like a little screwdriver or a little pick can help you get in there and pull these out. This is going to be the same style of clip that youre going to remove if you do not have a transmission cooler. Youre going to be removing one line thats going to be on the back of the radiator over on the passengers side, and it uses the same style. Push that down. Let that kind of run out. Do the same thing over on this side. Now, Im going to take the Push Pin fasteners out. Just pull out the center of them, and then you usually just pull them on out the rest of the way. Then we also need to take out the two 10-mm bolts that are located right up here. Now, we want to lift up. Were going to bring the bottom out, and try to rotate it upside down as quickly as possible. You can set that aside, return it to your customer. Now, were going to remove our temperature sensor from this brace that runs across. You kind of pinch in on each side it there. It will pop up for you. Remove that over and out of the way, and we can take out the two bolts. This one has a temperature sensor on each side here. Pop those up for now. Take out those two bolts holding that cross-brace in. That will give us the room we need to put our new cooler in. All right. Set that aside. Now, we want to take a little bit of automatic transmission fluid, and lubricate our hose here, and we want to push that well down and on the line. We want it to be maybe 1/2 inch past where that bar was. It will take a little bit of effort, but it'll go down. Kind of pushing and twisting at the same time while you support the line is usually the best method. Were going to bring that right below our bar. Then we can use 1/4" socket or nut driver, and get that secured. Now, Im going to take both of my lines, and Im going to run it up here to one of those mounting holes we had earlier for the transmission cooler, and Im just going to zip tie these up. That way they wont be wiggling around or anything while were heading down the road. Of course, we want to make sure we dont have any real sharp bends or anything in it. Then well just let those come over here for now. I want to come in about 3 inches from the end of my bracket on each side, and Im going to make a hole. This is where Im going to be repositioning my temperature sensors too. The holes going to be 15/32", so a little shy of 1/2". Now, we can put our cooler in place, and we want to align our upper brackets here. Once weve got those where we want them lets mark it. Now, with a 7/32" drill bit we want to drill through just the front side of our core support, or of our support arm here. Now, lets use the provided self-tapping screws, and we can get our hole started. With the provided self-tapping screws we want to thread these in to get our threads started. Do that on both sides. Just try to keep it as level and straight as you can. All right. Now we're going to bring our hoses around. Kind of position our cooler where its going to wind up. Lets bring our hoses around. Like we said before, we want to have a little bit of a loop to them. Well be cutting that one right there. You want to make sure you get a pretty flush cut. It doesnt have to be perfect, but you do want it to be pretty flush. Now we want to take our hose clamps, slide those up on our hose. We can slide that right down on the cooler. Do it for the top and the bottom. Then since our bracket heres just a little bit thicker than what it was made to mount to we can use a zip tie around the back of each of them to hold them in just to make sure they dont come out. We want that gray part of that sensor facing forward. Thats what actually measures the temperature. Now, our temperature sensors, we want to bring these up a little bit. We're going to be zip tying them off right to that main brace. This will keep them in the airflow so they can still monitor, and give us the readings that we need. All right. Get our cooler positioned, and get our bolts started. On each of our bolts including the factory ones weve removed going to put a flat washer. As you can see weve cut the length of our upper bolts down just slightly. Thats going to prevent any chance of them actually going through this support completely. Well get these snug down here at the top, and then we can snug down the ones at the bottom. All right. As you can see mounted in there nice and solid. Weve got our sensors here doing what they need to do. Now its time to tighten our hose clamps down, and we can check for leaks. To test for leaks were going to go ahead, start the engine, place our foot firmly on the brake. Then we can put our transmission in gear, and while pressing the break rev it up slightly to circulate the fluid. After about 15 or 20 seconds of that, just want to kind of put your hand closer to your cooler here and it should be warm. If youve got the warmth in there youll know that weve got fluid circulated all the way through it. We need to check all four of our connection points, so here and here, and also here and here to make sure those are dry and free of transmission fluid. If you didnt have the transmission cooler, and if you made your connections behind the radiator there then we need to check here and here, and then both of those at the top. Now we're ready to get our fascia slid back into position here. There are a few alignment tabs here at the top you can use for reference. Make sure weve got clearance around everything there. Then we just want to bring our corners right back around, and clip them back into position. Now we're ready to start putting our hardware back in. With no leaks detected thats going to complete our installation of the Flex-a-lite Translife Direct-fit Transmission Cooler, part number FLX4118GMT, on our 2008 GMC Yukon.


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