We had a local farmer’s 2007 Discovery 3 in today for an ATF Automatic Gearbox Fluid flush. The owner explained that the gear changes were not as smooth as they used to be and there was a noticeable judder at certain speeds.
A quick test drive showed that there was a noticeable bang between 2nd and 3rd and 3rd and 4th when accelerating. On gentle acceleration up a hill there was more of a shudder through the whole car rather than a little juddering. The Discovery had 137,000 miles on the clock so it was obvious the gearbox fluid would be well worn and well overdue a change.
First of all we checked for any faults with our diagnostic code reader, surprisingly for this age of car there were very few faults apart from the usual EGR related faults which are very common.
Next we put drive the car onto our 4 post lift and connect our special Fortron transmission flushing machine up to the car’s gearbox cooler pipes, we add a flushing additive that removes gums and varnishes from the internal parts of the gearbox valves, gears and internals. Whilst the cleaning chemical is circulating we cycle through each gear for a few seconds, we repeat this several times to make sure every part of the gearbox is operated.
The 6 speed gearboxes hold approx 9.5 litres of gearbox fluid, we set the machine to exchange 11 litres to make sure a thorough flush of the old, worn out, contaminated fluid is achieved. As the old fluid is drained, the exact same amount of new fluid is replaced, giving a true 1:1 exchange rate and 100% of the old fluid is removed.
Finally we lift the car up with the engine still running to check the gearbox level is correct. This has to be done with our diagnostics computer attached to ensure the fluid temperature is between the correct parameters. Before disconnecting the diagnostic computer we reset the gearbox adaptations, this basically resets the gearbox so that it re-learns the characteristics of the engine and your driving style.
Another test drive and the difference was remarkable, smooth silky gear changes, no banks or clunks and not a hint of any shuddering or hesitation. You can see the difference in the fluid in the photo, the old fluid was very dark and smelt burnt.
If you have a Discovery 3 or 4 or Range Rover Sport with the 6 speed automatic gearbox, get it booked in now for a flush service. Even if you have no symptoms or problems it may prevent a very costly bill in the future.
Give us a call or contact us to make an appointment.