Since I've had my car there has been a buzz in the drive train. The faster it goes the worse it is. I originally thought it was a U-joint but it has new u-joints since I changed transmissions. (The buzz was there before the tranny swap). I'm thinking, now, it's the pinion bearing but any pinion bearing issue I had back in the day they howled like crazy. This does not howl although there is a slight whine but not bad. The vibe is worse when I let off the gas than when there is power to it. I can play with the throttle slightly and increase or decrease the vibe. I am having it looked at next month. Not long after I got the car I checked the fluid level in the rear end & it was nearly dry.... NAPA carries a pinion bearing, crush washer & seal but to get carrier bearings one has to get the entire overhaul kit....

Doing Fords for 45 years. '56 Customline Victoria

E.J. in Havana FL