have a 1999 gmc sonoma, and i recently did a transmission fluid change on it(for the first time for me) it has about 70,000miles. i pulled the pan down, cleaned off the old seal, pulled down the filter, then put the filter back on, then the new seal and pan. i then put about three quarts of transmission fluid in ran the car for about 5 minutes, but i ididn't drive it that day, the next day i went to drive it and the engine starts fine, but nothing happenes when i shift it, like the transmission isn't shifting. i checked the linkage, and it seems fine, moving with the shifter. does anyone have an idea of what i did wrong?