Is T56 messed up?
Its designed to prevent you from engaging reverse when you are shifting between forward gears.
However, of the solenoid goes bad and gets stuck in the engaged position, or you have a wiring problem that causes it to stay engaged, it will give you the symptom you are describing.
Its designed to prevent you from engaging reverse when you are shifting between forward gears.
However, of the solenoid goes bad and gets stuck in the engaged position, or you have a wiring problem that causes it to stay engaged, it will give you the symptom you are describing.


