The heavy resistance has been solved as hand brake cable nuts not being done up. As the gearbox moved on its mounts it would snatch on the hand brake causing it to engage.
I know it's stuck in diff lock because every time I drive it just up the drive and back and then jack up a wheel the wheel spins a little to unwind and also no wheel will spin past half a rotation in any direction.
It would appear though that it has been left in diff lock for the 6 years it spent dormant. The six years may have caused something to seize as the four wheel drive worked prior to the six year rest it had.
I know it's stuck in diff lock because every time I drive it just up the drive and back and then jack up a wheel the wheel spins a little to unwind and also no wheel will spin past half a rotation in any direction.
It would appear though that it has been left in diff lock for the 6 years it spent dormant. The six years may have caused something to seize as the four wheel drive worked prior to the six year rest it had.