6l50 transmission problem help help help

[Hazem alnamat]

Hi guys i have a problem with my camaro in the automatic transmission 6speed since two months
The problem is when i put D and start driving the car, it move like 1 meter then the transmission slipping until its stops again the when try again to move it the same thing happens all over again
But when i put on tiptronic i can drive it normally the only thing that happens its a small slip between the first and the second gear
I change two whole transmissions including the tcm and i did a software update for all ecu's
And when i scan it on computer the is no trouble code every thing is good
And the problem never change
Any thoughts???!!!

[CCrowder]

Did you figure out what this was? I am having the same issue.

Please Help!
And Thank you!