After experiencing 3 x 'Gearbox fail' while in low range the dealership has replaced the gearbox in my 2.7L D4 on the last week of it's warranty! Fair play to LR the D4 is absolutely flying with the new upgraded box. They claimed the solenoids were sticking internally. It's still a 6 Speed but not sure what the upgrade is within the box but the difference is amazing!