My car is a 2000 Grand Prix GTP 53,000 miles
My trans shifts very firm, And doesnt give me crap, Ive had it for a week or so now.
Today i noticed 1-2-3 shifts perfect than i noticed when going into 4th (overdrive) Its rpms jump maybe 200-300rpms than come down quickly and it locks up and stays locked (this isnt every time just depends on throttle position), It doesnt slip out of overdrive but does jump a few hundred before settling down, With it having super low miles i really cant understand it having a bad tranny?
any help would be appreciated
Nate
(Pic of car)