GMFS founding member
ok on a long trip last weekend, my truck seemed to shake from front to back ever so slightly going 70 in OD when going down hills. then when pulling out of a gas station, from a stop, it revved real high like in N then slammed into gear. then it was fine for 400 miles. but today i noticed it slipping, it would rev and slip. i made an appointment with the stealership thursday. can't wait. any ideas what might be wrong?