Originally Posted by snrusnak
Thanks. Do you know which way oem coolers flow?
I believe they flow up as well this would be the external coolers. However if you're talking the stock cooler in the radiator then it differs from year and model, some have side flow radiators so the transmission cooler is going to most likely be installed vertically which means the flow would probably be up, then rads that have horizontal coolers will have a side flow however the internals of the stock centric cooler have small holes much like a screen that helps keep pressure and flow. It is very effective the stock coolers but when the temps begin to increase due to demands on the engine then the fluid coming into the cooler is almost the same as it's output.
Oh one thing I did that could be considered strange to some is that I installed my cooler between the pressure line and the stock cooler in the radiator. The reason I did this is because it has been proven to reduce engine temps at higher RPM's and under load, since I tow this would obviously be a good idea. It's actually common in the racing industry to find transmission cooler setups like this because the transmission fluid heats up quickly and most stock transmission coolers are installed in the bottom of the radiator which will just heat up the cooler fluid, this is a reason why many manufactures have implemented side to side radiators that have the transmission cooler mounted vertically inside the rad instead of horizontally.
I had installed a 3 row all aluminum radiator to help with cooling when I tow, I can say that I am very happy with my 3 row rad, it does a mighty fine job and it only cost me 112 Bucks shipped when when I bought it, I got lucky cause the place I bought it from raised the price to about 160 Bucks!
I remember not to long ago I actually overheated my engine because of the transmission temps getting to high. But I got lucky and noticed the temps getting to high and had to reduce speed dramatically and put my front and rear heater on which significantly reduced the coolant temperature.