As you all know, the most difficult problem to diagnose is NOISE. When it comes to gearbox noise, one needs to be highly trained to diagnose where the noise is coming from as there are so many possibilities. The noise may be due to any of the following: Planetary gears worn/broken, torque converter, pump, bearings, blocked filter. Sparklight have various ways of testing for noises and would recommend that the vehicle be brought to our workshop.