i recently purchased a 97 blazer and a few days later it started to shift very hard from 1st to 2nd hard enough to bark the tires under half throttle the 2nd to 3rd isnt as bad but it still hits harder then it should and it shifts perfect from 3rd to 4th...also i found a receipt in the glove box that showed the tranny had been rebuilt 20,000 miles ago so i dont understand how it couold haver any tranny problems....if anyone has any ideas on what it could be please let me know .....thanks