Start with 6 quarts. It will probally take 7 to 9. Start it up, put in R then D and recheck the fluid. Don't top it off until the fluid is fully up to temperature. Drive it and recheck it. When it gets close to full I only add 1/2 quart and then recheck it. You might have to put in and pull out the stick a bunch of times(wiping it off each time) to get a good reading as the fluid will keep dribbling down the fill tube. Don't ever overfill it. Good luck!
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning