Had to use diff lock after getting stuck in ruts.
Had to reverse out to escape...
Orange light went out after dis-engaging.

For two days vibrations were 'greater' throughout the vehicle,
seems to have returned to normal again.

Is this wind up between the 2 diffs,if so how do I prevent it.

diff wind up happens when you use the diff's without need.

driving forward or backwards(depending on direction of travel with the diff lock engaged) for a short period will unwind it..

the light normally stay's on if your diff is wound up thou and goes out once it unwind's even if you dissengage the diff lock.

the vibration's you have are most likely to be wheel balence...mud in the back of your rims is a useual..

however check you havent damaged any steering conponent's while stuck in the ruts..