6.5 turbo diesel transmission
 

i have a 1999 chevy 6.5 turbo diesel the tranny is messed up i just got it rebuilt and still is doing the same stuff. the tranny runs like a top until about 20 miles of driving. then it starts not wanting to shift from second or know what gear to be in kicking in and out of gear. if you could help me out i would appreciate it! thanks