2003 chevy silverado 4x4 transmission
transmission rebuilt 30 miles ago, and all of a sudden it quit shiufting and started slipping going into 3rd and 4th gear. i have been driving in 2nd when i had to go somewhere. i got back in it today and now it is shifting fine. i went home and after a couple hours got back in truck and it does the same thing , no 3rd 4th and od. also sometime when i switch the truck on it may be in 2wd or 4wd high or 4wd low. what the hell is gfoing on ? can some one help me out?