i have an 87 lt with a cabed 3o5. 700r4 transmission. the carstarted to shudder a lil in reverse. thought it was bad u- joints. replaced em and the shudder continued to worsen and then my reverse went out. i can rev the car up in reverse likes in nuetral. the car goes nowhere like it was in nuetral. i'm very cinfused because it works perfectly fine in drive overdrive 1 and 2. its perfectly fine except for reverse. any ideas???