Overdrive noise or jumping out
Annoying rather than dangerous.
Symptoms
Whining or grinding with overdrive engaged, or overdrive dropping out on the overrun.
Likely cause
Worn bearings, low oil or worn selector components in Fairey or Roverdrive overdrive units.
Suggested fixes
Listed roughly in the order most owners try them.
- 1
Check oil level
Overdrive units share or need separate oil depending on type. Check and top up.
- Difficulty:
- Easy DIY
- Cost:
- £ (Under about £50 in parts)
- 2
Recondition the overdrive
Specialists can rebuild worn units with new bearings and gears.
- Difficulty:
- Specialist job
- Cost:
- £££ (Over about £300)
This is general guidance gathered from owner experience and workshop practice, not a substitute for a workshop manual or a qualified mechanic. Costs are rough parts-only guides. Brakes, steering and suspension work affects safety, so if in doubt have it checked professionally.
Related faults
- Gearbox & transferHigh severity
Clutch pedal goes to the floor
Pedal sinks or stays down, clutch drags so gears are hard to select, fluid loss from the reservoir.
Series I · Series II / IIA · Series III · 90 / 110 / 127 · Defender3 fixes - Gearbox & transferHigh severity
Clutch will not disengage on Series (cross-shaft failure)
Clutch pedal works but the vehicle will not come out of gear, or the pedal suddenly goes light with no clutch action.
Series II / IIA · Series III3 fixes - Gearbox & transferMedium severity
Series gearbox jumping out of gear
Gear lever pops back into neutral on the overrun, typically in second or third, or when lifting off over bumps.
Series I · Series II / IIA · Series III3 fixes - Gearbox & transferMedium severity
Worn propshaft universal joints
Clunk on take-up, vibration that increases with speed, squeaking under the vehicle at low speed.
Series I · Series II / IIA · Series III · 90 / 110 / 127 · Defender3 fixes