I forgot to mention this only happens with the engine running,when not running the gears can be selected very smoothly.

Thanks for the quick reply,I've never delved inside a gearbox before ,is there anything I should look out for when I take the top plate off like pinging springs or anything that could fall inside etc. cheers.

Hi to all from swindon,I have a 1968 109 with a defender 300tdi engine and box in it,last wednesday I came back from shopping landy was running great,parked it in the drive all was well,came out the following morning to go to work and could not get it to go into gear, plenty of pressure on...