Quote:
Originally Posted by Spuds
Is it also possible that the muffler could have bounced or been bumped into the drive shaft?
Haven't seen harmonics mentioned so I'll throw it out there as a possible contributing factor. If you are racing around off road it's possible you hit some weird frequency between the front and rear bouncing around at different rates and moving around relative to each other. If it's a track, that might be repeated each lap.
More likely heat or muffler related though.
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I like your thinking, but there is not enough upward play in the exhaust system to get close enough to the shaft (it would hit a solid mount that I have fitted off the gearbox cross member first).