Did you replace the two filters inside the transmission pan when you changed the fluid?
If not, you need to do so since the fluid had been overheated.
Problem could also be a problem with the solenoid pack, you may want to consider changing it out with a new one. Be sure and use the same color, white, gray, etc...
Also note: This transmission is a big transmission and is most happy when slightly overfilled with fluid. Most run an extra quart over the full mark when hot.
And lastly,
ONLY use ATF+4 transmission fluid in this transmission, anything else can cause all kinds of issues.
If you continue to have transmission overheating problems, you should add an auxiliary transmission cooler to help supplement the cooling capacity of the OEM factory cooler.
SOLENOID PACK
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