LT230 Transfer Box Gasket Kit This listing is for a complete set of gaskets, seals and o-rings suitable for rebuilding the LT230 transfer box fitted to early Defenders (later ones use silicone instead of some gaskets), Discovery 1s and Range Rover Classics. This corresponds to the following part numbers: RTC3890 This will fit the following vehicles: Land Rover Ninety/One Ten - With LT77S LT85 Gearbox Land Rover Defender - With LT77S LT85 Gearbox to LA939975 Chassis Number Land Rover Discovery 1 - All models Range Rover Classic - LT230T with 5 Speed LT77 Gearbox Please see our other items for thousands more Land Rover parts and accessories.