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If it won't shift to 3rd and stays in second, bad shift solenoid/s. If it shifts and the transmission drops out(high RPM's), the bad clutches in the transmission. Rebuild. Solenoids around $600 to replace. Transmission rebuild around $2200.
There is a pressure sol. in the transmission that is bad . This is a common problem that requires removal of the side transmission cover. The transmission does not need to be rebuilt! Talk to a gm dealer. I have sold over a hundred of these pressure sol. and the side cover gaskets to a real gm transmission mechanic that have fixed this problem. GM parts over 20 years.