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I would also like to know more about this. I drive it in random California weather but it never gets all that cold around here. It would be nice if I could go straight to the cooler.
 

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Lots of debate on this one and a couple of schools of thought. I run my rad cooler after the aux cooler. The theory is dump as much heat out of the tranny fluid as you can, and then allow the radiator temp to moderate the fluid temp. It prevents the tranny fluid from being too cool, helps it warm up faster, and moderates the temp swings.

Others will tell you this is backwards.
 

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Ok i guess the question here is if you run the hot trans fluid through the radiator and you have a 180 thermostat in, the trans will not fluctuate far from that temp? If you like to drive far distances, then like to take off hard from every stop light (he he) then putting it through the radiator then to the external cooler you get a much greater heat dissipation into 10-12 Quarts of antifreeze than say through the heat dissipation through just a stand alone cooler will give you.
 

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Lots of debate on this one and a couple of schools of thought. I run my rad cooler after the aux cooler. The theory is dump as much heat out of the tranny fluid as you can, and then allow the radiator temp to moderate the fluid temp. It prevents the tranny fluid from being too cool, helps it warm up faster, and moderates the temp swings.

Others will tell you this is backwards.
Not me. I say this is the preferred method. You use the add-on cooler to dissipate the excess heat, then you use the engine coolant to do the "fine tuning" of trans fluid temperature. Trans warms up quicker which helps to moderate the excessive line pressures in a cold trans. There's no chance of over-cooling the fluid in cold ambient temperatures or at light load.
 

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Good timing with this post. I'm in the process of putting a new aluminium rad in my car, and it doesn't have a cooler in it. I'm running a external cooler right now (11 x 7 1/2) about 19000 GVW (stacked plate design). I'm also planning on running this as the only cooler. I have a 2800-3200 stall convertor in a TH350. Will this cooler size be sufficient? What size coolers are you guys running? Thanks for any info.
 

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I have always just used the tranny cooler and completely bypassed the radiator. Never had any problems.
x7 with an 8" converter driven a lot on the street with 500+ passes on the tranny. Been alive for 8 years now.
 
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I guess the question to ask here is,
How many of you run a trans temp gauge?
What heats up faster, the transmission fluid or the coolant?
 

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Water dissapates heat much more efficiently than air. Use both! I know many have had no problems, but it depends on your driving habits. Unless you use a trans cooler with a sensor and an electric fan attatched to it, you get nearly ZERO cooling in heavy stop and go traffic.....just my .02
 
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Zek67 is correct.
I disagree and it would seem most of the OEM's do too since the fluid goes through the radiator and then the auxiliary cooler in all the applications I've seen.

I think there is also a misconception that the engine coolant heats up faster than the trans fluid.

Dana Corporation, an OEM supplier, and manufacturer of Tru-Cool brand transmission coolers (also sold under the B&M and other brand names) says this about installation:
"Where should I install the cooler? If possible,
locate the cooler in an area where it will be exposed to
ram air. This helps maximize cooling. Install the cooler in
series and downstream of the radiator in-tank oil cooler."
 
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