can it be ujoint?

[larrys40]

Are you sure it's just not a normal decel vibration....? or is it actually a grinding/vibration type noise from the drivetrain. Loose pinion bearings aren't that hard to detect... and the U-joint if really bad will be there all the time... The Driveshaft/pinion bearing noise will change when power is applied vs/coasting.

I would determine if it's a normal thing from engine decel vs other drivetrain issues. If your new to Model A's I might suggest having someone schooled in your area ride or drive to check it out with you.
Larry Shepard