Automatic Gearbox Easy Change Kit with Metal Sump, Filter, Liqui Moly ATF and Wiring Sleeve for Discovery 3

The ZF 6HP26 6-speed automatic gearbox fitted to the Land Rover Discovery 3 was originally described as “sealed for life”, however in real-world use the transmission fluid gradually degrades due to heat cycles and mileage.

Old or contaminated gearbox fluid can lead to torque converter judder, harsh gear changes, slipping between gears and delayed engagement. Regular servicing helps maintain smooth gearbox operation and prolongs transmission life.

This comprehensive gearbox service kit includes a metal easy-change sump conversion, high quality Liqui Moly Top Tec 1800 automatic transmission fluid and a replacement gearbox wiring sleeve. The sleeve is a known wear and leak point on ZF 6HP26 gearboxes, so replacing it during servicing helps prevent future fluid leaks and electrical connection issues.

The original factory sump incorporates the filter, meaning replacement normally requires lifting the engine and removing surrounding components. This easy-change conversion replaces the plastic sump with a durable metal pan and a separate replaceable filter, making future gearbox servicing significantly easier.

Common symptoms of degraded gearbox fluid

• Torque converter shudder during light acceleration
• Harsh or delayed gear changes
• Gear slipping or hesitation
• Noisy or rough transmission operation
• Poor shift quality when hot or cold

If your Discovery 3 is experiencing any of these symptoms, servicing the transmission fluid and filter can often restore smoother gearbox performance.

Kit contents

• Easy-change metal transmission sump pan
• Separate replaceable gearbox filter
• Gearbox sump gasket
• Complete set of replacement sump bolts
• 7 litres Liqui Moly Top Tec 1800 automatic transmission fluid
• ZF gearbox wiring sleeve

The 7 litres of ATF included allows a double drain and refill process, helping replace a greater percentage of the old fluid during servicing.

Easy-change sump conversion process

1. Drain the transmission fluid and remove the sump bolts.
2. Carefully cut the plastic filter neck on the original sump.
3. Remove the original plastic sump pan.
4. Install the new separate filter.
5. Replace the gearbox wiring sleeve.
6. Fit the new metal sump pan using the supplied gasket and bolts.
7. Refill the transmission following the correct ZF gearbox filling procedure.

Vehicle compatibility

Discovery 3 (L319) 2004-2009
Models fitted with the ZF 6HP26 6-speed automatic gearbox