Driving to work yesterday and suddenly the trans doesn't want to shift I pull over and check the master cylinder for the clutch but fluid is full Trans will not go into gear unless engine is turned off When I start the engine with trans in gear truck wants to move forward I can up shift but I have to rev the engine I can't downshift with out turning off the engine No funny smells or sounds Truck was running fine one minute then it won't shift Truck has 30,000 miles Never raced No burnouts Smarty on 3 I only goose it once in a while to pass slow pokes or to merge into traffic Is there some sort of adjustment I can check I crawled under but only saw a huge trans and couldn't see any rods or anything Is it time for a new clutch