Problems with automatic gear box!!!!!

I have a 1995 2.5 diesel Land Rover discovery with a 747 3 speed auto/left hand gear box. Broke down on the motorway this morning and had it brought back home. was excelerating away when there was a clunck and then no drive. Can anybody advise me as to what might be wrong with it before I think about getting a mechanic out to look at it. Thank you.

try it in diff lock

jamesmartin said:

try it in diff lock

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ok thanks will try tomorrow morning.