H L Smith unveils the mysteries of fault diagnosis in the Allison World Series automatic transmission.

Servicing your automatic gearbox is the best thing you can do for your pocket and transmission life. Failure to do so will undoubtedly cause problems. It is essential that the automatic fluid level is correct, clean and free from debris.
Small hydraulic galleries are more likely to get blocked, causing valves to stop,
clutches to slip, creating more contamination, possibly resulting in transmission failure, time off the road and extra expense.
World Series electronic control transmissions are a giant step from their predecessor, the MT Series, however, problems inevitably still occur....Read more...