I installed an aftermarket Transmission cooler for my C4 with stainless steel #6 line and fittings. This install took me about 3 hours to complete and total cost was 260.00 dollars. I ordered the biggest trans cooler I could get this unit was a perma-cool #1024, it has #6 fittings already on the cooler. The cooler size is ¾”x 10”x 15 ½”. I ordered a 20’ roll of #6 line, 4 90* hose ends, and two case fittings which are 1/8npt to #6an double male.
You first want to start out making sure the car is cooled down this way you won’t burn yourself around the headers. I grabbed my drain pan for the drips and leaks when I unhooked the lines from the radiator. I bent the lines down a bit so they would drain into the pan while I unhooked the fittings from the transmission. This was actually the hardest part. I had to jack the passenger side of the car up and placed a jack stand under the car for safety. The front fitting was easy to get to, although I had problems with the line being rusted to the fitting it still came off. The back fitting required me to brake the steel line as it went into the 90* fitting. Then I was able to get a wrench on the 90 and rotate it out of the case. It is very tight and that one fitting probably took me 45 minutes.
Next I measured my lines and setup how I wanted to route them. I’m still not 100% finished mounting the trans lines, but for now they are positioned with cable ties. I will make stainless steel clamps at work to finish it off. Then I installed the fittings on the hose ends. Installing fittings really isn’t that bad, the easiest way I found to-do it was to wrap the line in duct tape putting the middle of the tape where you want your cut. Then I use a cut-off wheel on my electric die grinder and cut right into the middle of the tape. I take my time trying not to tear it up to bad. After I cut it I very carefully unwrapped the duct tape, this is very important to take your time while removing the tape b/c you can pull the hose strands out and it will be a mess. With the tape off and your fitting apart I spray silicone spray on both. I install the bottom part of the hose that I just cut into the fitting end and squeeze/force as much SS strands into the fitting as I can, and then I push it in while twisting the fitting end. Some fittings have a slight left hand thread for ease of hose install. I’ve also used pam instead of silicone but it makes a bigger mess. Also make sure you push the hose all the way up the edge of the threads, now I mark the hose to make sure it isn’t pulling out when I tighten the fitting up. Spray some silicone on the nipple end of the fitting and insert it into the hose. Tighten the fitting, and you’re done that part.
As I was mocking up the lines I tried to keep them as close to the configuration as possible I used cable ties to hold them in place. I also placed the cooler in position but did not mount it this way I would be able to tighten up the fittings once the hose were on.
I moved the cooler as high up as it would go when against the radiator this way it would get the maximum amount of airflow and not be blocked by the front valance. The pictures I have later on will show how I routed the two lines together.
At this point it was time to install my case fittings, on the npt end I used a small amount of Teflon top to insure a leak free install. Remember no tape on the AN fitting side.
Here you can see the back hose is on and the front fitting is in. Once all fittings were in and all hoses connected I positioned the hoses and then tightened up the fittings. It easier to show you in pictures how I routed the lines instead of explaining it. So here you go:
As you can see they are kind of sitting on the steering linkage, but I had to route them out of the way of the headers. There is a bolt from the trans cover that I plan to use for a clamp to hold the hoses up off the linkage so they don’t rub. I then have it cable tied to the cross brace under the oil pan. And then I have it cable tied to the bumper support where it meets the frame. From there the lines go up and in front of the valance and to the cooler. Now that everything is hooked, run the car to top off the trans fluid with Type F and see that there are no leaks.
Everything was supplied by Alex from Moneymaker Racing Home Pa