Automatic Gearbox Easy Change Filter Kit with Liqui Moly Top Tec 1800 ATF for Discovery 4

The ZF 6HP26 6-speed automatic gearbox fitted to early Land Rover Discovery 4 models was originally described as “sealed for life”. In practice however, transmission fluid gradually degrades due to heat cycles and mileage, which can lead to reduced lubrication and declining gearbox performance.

As the fluid deteriorates it can cause a number of common transmission problems including torque converter judder, slipping between gears, delayed engagement and harsh shifting. Regular servicing helps maintain smooth gearbox operation and can significantly extend transmission life.

This premium gearbox service kit includes a metal easy-change sump conversion together with high quality Liqui Moly Top Tec 1800 automatic transmission fluid, allowing a proper gearbox service without the complex procedure normally required to replace the original integrated plastic sump filter.

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

Common symptoms of degraded automatic gearbox fluid

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

If your Discovery 4 is experiencing any of these symptoms, servicing the transmission fluid and filter can often restore smoother gearbox operation.

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

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. Fit the metal sump pan using the supplied gasket and bolts.
6. Refill the transmission following the correct ZF gearbox filling procedure.

Vehicle compatibility

Discovery 4 (L319) 2009-2012
Models fitted with the ZF 6HP26 6-speed automatic gearbox

This kit is not suitable for later Discovery 4 models fitted with the later 8-speed automatic transmission.