I have a 1990 D150 and lately is has been weird. When accelerating from a dead stop it jumps and shakes real bad. It also takes forever for it to shift after it is moving. And it is making a funny noise "ping, clank". I replaced the trany filter today and when i dropped the pan i saw an O-ring thing that looked like it was in the wrong place. I will have pics on webshots in the morning. Please help do i need a new trany.