Depends on the facilities you have Andy. If you have access to a hoist, then it would be more accessible and easier, especially if a transmission jack is available, to remove the gearbox and leave the engine in. However, when you are lying on your back underneath and trying to manouver such a large lump it's a different ball game. O.K. you have gravity to help when it's coming out but lying down and trying to lift it back in is a lot harder. Personally, I would opt for the engine out with an engine crane-more controllable, plus if you decide to check the engine over, it's more accessible and you can be sure that you can replace gaskets etc. easily. You could have the engine out in a day and allow another day for refit, so that will give some idea of how long you would need the crane for. Plus of course, the length of time to do the seal and any other bits & bobs. If you find the seal journal on the crank is scored don't worry-you can fit a shaft repair sleeve easily. Google Barnwell Services in Smethwick, West Midlands for more info. It will pay you to drop the rear main bearing cap and renew the "Crucifix" rubber seals which fit in the sides of the cap. Also check the flywheel drive plate for cracks (Common). One thing is for sure, it will keep you busy!!:behindsofa: