I decided to do a write up for the transmission cooler.
Transcoolers are very important in 3rd generation 4runners to avoid the pink milkshake issue. (google it!)
I went ahead and bought the B&M 70268 transcooler.
Picked up a quart of transmission fluid, some hose clamps, and 3/8" inner diameter transmission hose from vatozone.
First step is to make sure the 4runner is cool. Don't want to get scalded by any hot transmission oil while removing the existing transmission hoses.
Next I removed the grille
The grill is held in place by five support clips. Each support clip looks like this (pictured already popped out):
If we look to the side of the support clip, well see its open. There is a little knub in there. This knub needs to be pushed back with a flathead screwdriver to disengage the support clip.
Next we go under the 4runner and remove the skid plate. It is being held in place by a few bolts:
Dropping skid plate:
This will expose the bottom of the radiator and the transmission hoses:
The driver's side transmission hose is the RETURN line.
The passenger side transmission hose is the SEND line.
Follow the hoses until you reach where they connect to hard transmission tubing. The transmission hoses are the ones with the sleeves in the picture below. I couldn't take a better picture because they are in a tight spot:
Next I mounted the transmission cooler, notice that I had to remove the drivers side horn and placed it on the same bolt that holds the drivers headlight. I decided to do this because I didn't want to obstruct wind flow across the transcooler:
I also went ahead and connected the hoses:
I attached the transcooler onto the radiator using supplied zip ties.
I ran the hoses thru an opening to the left of the radiator, it appears that some tubing runs thru there also.
After removing the existing radiator hoses, I attached the upper transcooler hose to the SEND tubing.
I attached the lower hose to the RETURN tubing. I made sure to not mix these two up.
So what happens to the exposed inlet and outlet at the bottom of the radiator?
I used some leftover transmission hose to connect them together.
If I ever need to use the radiator in an emergency, I can always connect back to it.