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I'm building a 1970 f100. I recently fired up and timed my wicked 306 I built that is backed by a built c4. I noticed a clatter/vibrating kind of noise around 2200 rpm and seems to get louder with acceleration, but goes away at about 2600 rpm. there is no noise at idle other than a nasty lopie cam, but it sounds to me like it is in the bell housing. I had a guy come over who has built several pulling trucks and motors and he thinks its something with the block plate, flex plate, and convertor. if anybody has any suggestions they would be very appreciated!
does it sound like a problem in the bell housing? I don't think its a bearing since the longest its ran was for 15 mins without a load and there isn't noise the whole time.