My truck maybe taking a poop on me but im not sure. 1988 chevy pick up . new jasper engine abd was running good untill yesterday i went out and all i had was reverse. The truck moves but it doesnt seem to be slipping real bad it almost seems like theres not enough vacuum . there was no warning for this. I changed the tranny filter and fluid last night and the fluid looked ok. but the pan had a little fibers in there. Any ideas what could cause this or does it seem like the tranny is toast? I didn hit a big Fn cat the night before but I centered up on that puppy and took it out square with my right front wheel It was ok the rest of the night. The truck that is, The cat well you get the picture!