So i got a 2004 Chevy Silverado LS 2wd with 154xxx miles auto trans. My transmission picks and chooses when it wants to go in reverse some days itll go in reverse no problem and other days itll feel like its in neutral. Then i would have to shift from park to reverse till it grabs reverse. Does this mean my tranny is going to need a rebuild. Also i have no problems with any other gears just reverse. Thanks in advance for help.