I have an 88 chev 4.3L. It had a replacement 4 speed put in. Every gear on the tree is drive though. I have no reverse or neutral. Park engages, but the truck is still putting pressure on the motor. Whenthe trannyfirst went it was facing my deck and I had to use my 4x4 to pull it away from the deck, the strange thing is the tires wouldn't even roll backwards, they just drug... Any idea what's goin' on?