Engine Vibration

["Foley, Tim (CAP, ITS, US)" <TFoley@gecits.GE.com>]

Dear MG Guru's:

When I am driving my '71 MGB at highway speed and initially take my foot
off of the accelerator  I hear a small vibration at 3000RPM (almost like
someone is blowing on a beer bottle).  The noise goes away if I
accelerate or slow down some more.  It drives straight and I can not
feel the vibration.  I only hear it in 4th with O/D on or off.( For the
Record:  I Love my Overdrive)

On a minor note,  My interior is a light brown - not Autumn Leaf could
it be Ochre??

Any help would be greatly appreciated

Tim Foley
1971 MGB