Sorry, it was late, good point about the type of noise!
It's a ripping sound, if it happened on say a 501x I'd deffo say belt, but once had car with a diff that made a similar (weirdly) sound. It doesn't sound like the spur/pinion mesh, although I have that slightly tighter than I'd want there is a little backlash (for some reason found it really difficult to position the motor).
Belt tension wise, it's what I'd run on a 501/yok etc but I do normally run on the looser side for those, sounds from these posts that this needs to be a lot tighter so I'll try that and see. I know normally to just sit a roller "over" the belt without adding tension, but I just considered fitting an adjustable one and then dropping it onto the belt quickly to add tension as a "quick fix", as it's take all of 5 seconds to adjust! Anyway, first step tighten belt I think!
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