Hey everybody I have a 2002 grand prix gt and I'm on my 2nd tranny,I believe this 1 was rebuilt but not 100% sure,anyway when I'm cruising 1st 2nd and 3rd work fine but when I'm in the top of 3rd gear going into 4th it just stays in 3rd,now if I go Wide Open Throttle it goes into 4th with no problem...anybody have any ideas or suggestions on what it could be? Ay help is appreciated thanks!