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Old 02-09-2009, 11:49 PM
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T-400 Cooler Lines

Noob here with some more 4oo questions. Because I have a new 3000 stall converter in this new 400, I was told to run an external cooler. I'm gonna run a DeRale # 13700 with a fan. Which line coming out of the trans is the pressure line running to the cooler? Or does it matter? Also, because there is no room in front of the radiator for the cooler, my external cooler is going under the bed of the Luv, should I run a line to the radiator, then to the cooler then back to the trans, using both coolers? Or should I just plug up the radiator ports and use the external cooler? HELP!!!! lol Thanks in advance folks!!!




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Old 02-10-2009, 12:13 AM
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I cant tell you which line is which but I can tell you that you should run the fluid thru both the radiator and the external cooler. But make sure it runs thru the radiator first and THEN the external cooler. You could loosen the lines while the vehicle is idling. If oil flows from the line, youve found the pressure line, if it flows from the radiator, youve found the return line. You'll want to plumb the external cooler into the return line so the ATF gets cooled by the radiator first.
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Old 02-10-2009, 05:40 AM
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the bottom fitting is the 'out' line of the transmission... the aux cooler must have air flow through it to function properly.


it sounds like an aux cooler with a fan on it would be better for you , than having such long runs of cooler lines front to back of the truck..
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Old 02-10-2009, 06:12 AM
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Quote:
Originally Posted by Torque454
But make sure it runs thru the radiator first and THEN the external cooler. You'll want to plumb the external cooler into the return line so the ATF gets cooled by the radiator first.
If the vehicle is to be driven in cold weather, the opposite is true. The auxiliary cooler may actually cool the fluid too much. Having it go through the radiator cooler will warm it up a bit prior to going back to the tranny.
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Old 02-10-2009, 10:13 AM
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Quote:
Originally Posted by redsdad
If the vehicle is to be driven in cold weather, the opposite is true. The auxiliary cooler may actually cool the fluid too much. Having it go through the radiator cooler will warm it up a bit prior to going back to the tranny.
True but in warmer weather the radiator cooler would likely warm the fluid back up too much. It couldnt cool it any cooler than the coolant in the radiator...
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Old 02-10-2009, 02:08 PM
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TH400 Cooler Lines

Cool, thanks for the info. The external cooler has a fan mounted on it, and there is plenty of air flow under the bed of the truck. The problem now is, I was just told that the radiator is not repairable, so now I gotta find someone who can custom build another one for me.
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