I recently bought a 78 Chev Camaro I'm restoring. The transmission was out in it and I was given a transmission with it that was suppose to be good. I swapped them out recently. The transmission worked for about 5 minutes around the neighborhood, then nothing at all. It has totally quit working in forward and reverse. I changed the fluid and filter when I swapped them. Since it is not doing anything at all, is there something simple to try? Or will it need a rebuild? I have done about everything to cars, but never rebuilt a transmission. Should I buy a manual and try since I have an extra transmission to experiment with, or will I be wasting my time? Thanks for you input.