GE Washer will spin but not agitate

Hello,

Our GE washer will fill, spin, and drain, but not agitate. I replaced the Agitator Coupling Kit, but it is still a no go. I took off the front panel and watch the cycle. When it is about to agitate it will spin a few times and then stop. It sounds as if it is agitating, but no go.

Any thoughts? I checked the belt and it is tight. Rather not replace it if I don’t have to .

Thank you!