Question about 1999 GMC Sonoma

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None of the gears will engage.

1999 GMC Sonoma, 2.2 automatic, rear wheel drive. My truck drove fine, then suddenly would not engage in any gear. I changed the trans fluid and filter and it drove fine again for a couple of days, then back to none of the gears engaging. Cranks and runs fine, but no gears. Any ideas? I'm thinking the torque converter went out or the trans is shot. But how does it go to driving fine, to nothing all of a sudden?

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It sound lot as if the pump seal has gone

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