skylark
I'm Awesome
My 2002 S10 , yes not a 400 but the same tranny, was due for a tranny service. I bought the synthetic Amsoil synchromesh fluid. I had what sounded like a noisy bearing. When the clutch pedal was released and the tranny was spinning internally there was noise, with the clutch pushed in the noise would go away. It also had a sound similar to an old truck 4 speed (SM465). All of that is gone! GONE!! GONE!!! I'm a happy camper!