2000 Chevrolet Blazer Q&A

2000 Chevrolet Blazer Question: My car wouldn't move when I put it in drive then later it did is it the tranny?

It shifted but wouldn't move then when I put it in drive 3 it inched a little and there was a squeaking sound. I had it towed to my mechanic and he was able to drive it and told me to take it to a transmission shop. How can it not move one minute then drive the next? -
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