transmission problem?
 

I have a 97 4x4. Just recently when driving the tranny starts slipping and the tach and spedometer die. Then it only works when i manually shift into 2nd. But it only happens so often, and the rest of the time it drives fine. Im a little scared that it the tran missions gonna soon need replaced or rebuilt. The fluids fine and theres no leaks. would just like a little input before i call the garage.