THE AXILINE transmission dynamometer tests elements of a transmission that would be difficult or impossible to assess after installation. The dyno runs the transmission through the gears under a variety of simulated operating conditions.
Simple noises are a case in point. The operator can stand right next to a running transmission and listen to it without engine noise while visually checking it from every angle. Hearing exactly when any noises in a trans are present is an invaluable diagnostic tool. A high-pitched noise may indicate a worn pump. A noise from the converter can be confirmed by listening to when it occurs. If, for instance, thereís no noise in Park or Neutral but there is in Reverse and Drive, itís likely a turbine bearing fault. When gears are engaged, pressure increases and the two halves of the converter tend to separate, which loads the bearing and increases noise.
Pressures, shift points and speeds, down-shifts, converter lock-up characteristics, stall speeds and more can be tested, logged and recorded. Vacuum circuits on older-style transmissions like the 350 can also be tested, as can solenoids and modern electronic control systems.