My shop manual tells me the capacity is "Approx 6-1/2 quarts". The refill procedure (with empty torque converter) is to add 5 quarts, run the engine at idle for two minutes, add another quart, shift the tranny through all positions, return to park, check fluid and add as necessary.

If you're just servicing the trans (not emptying the torque converter), the manual says to add one quart after the pan is back on, idle two minutes, add another quart, shift the tranny through all positions, return to park, check fluid and add as necessary.