I'll cross-post quote myself here:
Quote:
Originally Posted by PaleMelanesian
Here's the problem with a bump-start at speed. The purple collar is spinning with the gold shaft at driving speed. The clutch is to the left, between the green shaft and the engine. When you engage the collar into either of the blue gears, it's spinning while the blue/red/green parts are not. That's what makes the grinding. The faster the vehicle is moving, the more likely that is. Synchronizers make the process smoother.
I have still not had any problems with this on my car, but you can see how it's possible.
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