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Old 02-21-2012, 10:52 AM
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4l65E Fluid Contamination

I recently rebuilt a 4l65E, it had a flare going 2,3 and forth. You could watch the tach in the vehicle go up to 2000 rpm flare up to 2200-2300 then drop into gear at about 1500-1700 rpm under moderate throttle. When I dropped the fluid from the pan, it came out a pink milky color, meaning it was contaminated with coolant. Only has 3 miles on it, I have not drove it since I cleaned everything out and changed the radiator. I went through it yesterday and cleaned everything, blew through the open cooler lines with brake clean, same with the external trans cooler I let it sit with brake clean in it for a few hours and then blew though it with light a air pressure. Obvisouly fluid contaminated you would probably not get a good shift, I repacked the 2-4 servo and installed a sonnex valve in the 3rd accumulater check ball, and installed the orange box shift correction kit to fix the flares if not caused by the fluid or 3rd accumulator check ball leaking. I have seen those where they don't seal off and burn up the band. I did the leak check but you never know.

Is it recommended that I go back through the transmission and change the frictions, band and torque converter due to the contamination? I have heard that coolant disbondes or releases the glue that holds the frictions to the steel plate that makes up the friction, same with the band, and same with the carbon friction in the torque converter.

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Old 02-22-2012, 06:41 AM
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Thanks for the help~!
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