Disco is big , heavy and 4wd it requires a strong engine.
The big old 4.0 V8s are strong along with the Tdis but they kind of lost there way after that,sure the td5 was ok but it will always vibrate itself to death.
must confess not familiar with the 4.0 and TD5’s, daft question is that the puma engine please
am impressed with the gearbox in my D3 , being the ZF6HP , can’t hear the gears changing and extremely smooth , the ZF 8 x speed is supposed to be even better , just a shame about there engines
as they say “ the modern engines are a hand grenade with the pin pulled and don’t know when they will go off “