Has anyone got one of these gearboxes please that they would be prepared to sell? Or does anyone have a diagram which shows just where the various thrust washers on the various shafts, a simple hand drawn fag packet sketch would do? My problem is the engagement of top gear when under load. At rest I can get all four gears, likewise when the engine spins the box whilst on the stand it will engage top gear but once out on the road it will only engage the first three gears. Any help in anywaayu, would be greatly appreciated. Thanks in anticipation. Nobby