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There can also be a rattle at times in the shift to direct drive or what some would consider the "3rd shift" caused by the direct drive clutch facings not grabbing quickly. The flare needs to be corrected-usually by a throttle linkage adj. The direct drive can be alleviated by just letting up on gas when the shift happens so it is not under load at the instant.
If that's what's happening, then it sounds like you have the same problem I had on my '56 Patrician, the clutch disc in the converter dried out. The best thing to do it, drain the fluid, fill it back up with Type F, drive it normally for around 500 miles, drain, repeat. Then, on the second administration of the Type F, when it makes the noise, push on the gas harder for a little bit, like 30 seconds or so at a time, then let off. Do this for the next 500 miles to get the glaze off the disc. The thing that I really think helped me was the additive that Ford used when the first started using Mercon V, which may or may not still be available. There was a few additives missing from the batch of the fluid, in new cars, and they had a little bottle of friction modifier to add to the trans. Since I worked at the Ford dealership, and it was only about $5 my cost, I thought "what the hell" and tried it. It GREATLY reduced the incidents of clutch grinding, but I don't know if it's still available anymore. Then, after the 500 miles, on the THIRD drain, refill it with B&M TrickShift, and the noise and vibration is gone for good. I did this with my Pat, after it sat in a pasture for 40 years, and it fixed it. You WILL have a vibration if it's the clutch disc, and it WILL be noticeable, like the car's about to fall apart!
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