GM often provides archived manuals for older models in PDF format.
7.4 quarts (7.0L) for a drain and refill. Use DEXRON-III Automatic Transmission Fluid. Fuel Tank: 25 gallons (approx. 95 liters). 3. Essential Maintenance Schedule Chevrolet Venture 2003 Manual
Located in the engine compartment on the passenger side, near the battery. GM often provides archived manuals for older models