Oh yes, I pounded around down there while I was down replacing that transmission bracket bolt.....
Everything seemed solid and tight. No rattles from the exhaust system.
And it IS a pretty loud racket, but it just lasts about 2-4 seconds, depending on how hard you are stomping on the accelerator, and it only occurs from an initial dead stop.
Somewhere in the drive train there must be SOME kind of sprocket that is slipping, because it's JUST like a clutch slipping in a manual transmission when you rev the engine but the rest of the car hasn't "caught-up" yet.... :-), only it makes a "ratcheting" noise, like "teeth" on a gear slipping.
The rest of the time driving you wouldn't even know anything is wrong....

Thanks.

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Barry