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Old 04-12-2010, 11:12 AM
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Trans Cooler

I just finished my th400 build and I'm just about ready to throw it in the truck but I realized that my factory transmission oil cooler has got to be filled with garbage from my 700r4. When the 700r4 went there was tons and tons of friction material in the trans fluid which would have also made its way to the trans cooler. Is there any way to completely clean out a trans cooler short of buying a new radiator? I plan on running an aux cooler also but then I want to run it thru the radiator too.

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Old 04-12-2010, 03:33 PM
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Flush it out good with soapy water and the water hose. Then flush it out with parts cleaner and blow it out real good with compressed air (be careful to not put so much pressure on the lines as to rupture the tubes that run in the tank). Do a pressure check on the radiator to make sure that no coolant can leak over in to the trans side. An alternative would be not to use the coolant lines that run through the radiator tank but use an after market cooler only. There is a draw back to this in that in the winter time the warm coolant also helps to warn up the transmission.
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