Is it just mine are all they all slow? I took mine in with 45K and chevy had to replace all the lifters on the pass side. Now its a little quicker but still really sloooow. I have a 2003 tahoe with the 5.3 and it will get up and go. It's got 160K. It always feel like the transmission is shifting up and down all the time or slipping or something. There is the right amount of fluid in it and it is red, no bubbles and no white. It actually feels like its the transmission thats holding the motor back. I just wondered if anyone else has that feels the same.