What's the GMC Savana 3500 transmission fluid capacity?

The GMC Savana 3500'S6.0 liteR8-cylinder engine is equipped with the 6L90 automatic transmission that useS6 quarts of Dexron ViATF fluid. A transmission flush and filter change is needed every 30,000-50,000 miles. Problems associated with a failing tranny include hesitating, slipping between gears, surging while idle and lowered speed capacity, sometimes under 30 mph. The vehicle can get stuck in park or fail to engage, if the transmission is going bad. Low fluid levels can cause burning smells, leaks, and clunking, grinding or "humming" noises. Regular maintenance can extend the life of the tranny. Cost of servicing averages $170-$190 in materials and labor. Cost of replacing the tranny can range from $3,000-$5,000 in parts and labor.