Manual and Automatic Driveline and Transmission Systems
Core concepts
Understand clutch operation, manual gearbox construction, synchronisers, final drive and differentials. Know automatic transmission types, including traditional planetary, CVT and dual-clutch, and the role of the torque converter. Cover driveline components such as driveshafts, CV joints, universal joints and differentials. Diagnose common faults: clutch slip, judder, gear selection difficulty, transmission shudder, delayed engagement and driveline vibration. Understand fluid specifications and service intervals, and the importance of correct fluid level and condition.
Traps
Questions often test whether a clutch that slips under load indicates wear (it does) and whether a CV joint clicking on turns indicates an outer joint fault. Watch for confusion between a torque converter and a clutch, and for the assumption that all automatic transmissions use the same fluid.
Worked example
A manual vehicle slips when accelerating uphill. Check for free play at the clutch pedal, then road test to confirm the engine speed rises without a matching vehicle speed increase. Inspect for oil contamination on the friction disc and measure clutch wear. Replace the clutch assembly as a set, including the release bearing and pressure plate.
Rule of thumb
Match the fluid to the specification. The wrong fluid can destroy a transmission.