OK, start again mate. We need to know what is the prob? is it broken? and which side you need. If your looking at the front of the tank, is it the left or right gearbox? If you have stripped a gear, I may have a spare gear wheel you can swap out rather than change the whole gear box. If it is just a gear wheel, show me which one and I may be able to post you a replacement. Or there may be someone closer than me ( tother side of the planet) that has one.