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Just had a complete factory rebuilt 4l60e installed after finally having issues with the original.... now 400 miles later the exact same issues with the new one.... when towing with it check engine light comes on harsh shifting and a lot of slipping occurring.... again this is only when towing..new clutch fan and external
Cooler were installed as well.... transmission code is transmission components slipping again what’s next?? Any help
 

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Did you replace the torque converter as well? Also 60e's tend to have a PWM solenoid problem especially after a rebuild if they used the same solenoids.
 
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