Sound of jackhammer?

fordmustang351

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Hello,
Sorry for the english, it is translated with google.
With my 67 Pontiac Catalina, I keep making the sound of a jackhammer while driving. At least it sounds like that. I don't have the noise when the car is stationary, I can't reproduce it there, even if I turn up the speed. I can't say where the noise is coming from either. The wheel bearings should actually be fine, as the wheels turn easily and don't wobble or something.
Where can the noise come from, gearbox or differential?
I changed the engine this year. Had a bit of trouble to put the gearbox (Muncie M20) back in place. Did I kill a ball bearing?

Tobi
 
If you put the transmission in neutral while moving does the noise change?
 
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