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Without a doubt one of the best investments I've ever made.  Note the width of the unit on the left, this added cooling ended the rare but annoying overheating when stuck in traffic on a 90+ degree day with the AC running.
    bolt=>
Clamp=>
Clamp =>
   bolt=>
<=Clamp
Hose=>
Upper and lower =>
trans cooler lines
                          =>
Screw=>
Screw=>
Remove the two screws that hold the fan shroud on.  Slide the shroud back over the water pump.   Remove all the hose clamps (catch the coolant)  and bend the hoses back out of the way,  be sure to inspect and replace them if necessary.  Remove the bolts that hold the top clamps and put them where they won't get lost.  Using the proper size wrench remove the trans' cooler lines cover the ends with a bag or plastic wrap.
<= The old radiator ready to remove.  Tilt it back toward the engine and lift up carefully.
Slide the new radiator in making sure that  the bottom is seated properly. Put the top brackets in place and tighten the bolts. Hook up the radiator hoses and transmission lines.  Remove the clips from the old radiator and put them over the holes in the top of the new unit.  If you used a CSF radiator now is the time to put in your fan switch (if used) with the Nissen unit the switch should be screwed in already.
Hook the fan shroud on the bottom of the radiator and secure it at the top with the old screws.   Refill with a 50/50 mix of good quality antifreeze, start the engine and check for leaks.  be sure to let it get to operating temperature.  Drive the car until the trans warms up and check the fluid, mine took about 4oz to bring it back up to the line.  Check for leaks again.