Noise in Drive Train

[shew01]

I just got back from a 300 mile tour with a number of Model A friends, and I noticed a noise in the drive train about halfway through the trip. I initially thought I wasn’t pressing on the clutch far enough, but it turns out that the clutch does not affect the noise at all.

It’s a thump thump thump sound, and it does not seem to appear as long as I have a load on the drive train. However, when I let off the gas, I sometimes hear the thump thump thump sound, especially at low speeds, around 5-10 mph.

I was in a parking lot near home, and I especially heard it while coasting in neutral.

I’m thinking this is either the universal joint or something in the differential.

Can anyone offer any debug advice?


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