I'm a new truck driver and i've noticed that occasionally while double clutching it won't go into gear, reving it up to over 2200 rpm doesn't seem to work (i don't want to damage the motor) or letting the tac drop to idle while racing down the mountain doesn't seem to work either. Whats the best range to attack this problem and should I be using the Jakebreak all the time? I don't want to cause an avalanche in the snowy months, I don't want to loose my brakes and crash. I don't want to be limited to an automatic transmission. My trainer (while I'm panicking) jams it into gear and can't seem to explain how they got it into gear. Gear jamming was not recommended or taught at the Tech college truck driving school in MN. So I would appreciate some feed back here, thanks.