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Discussion Starter #1
There seems to be a whine from the rear end
It is not present when the car is under power, but is present when I lift off the gas and the car is coasting.
 

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65 Fastback 289 4 spd, 65 convertible 5.0L 5 spd. 3.73 8.8
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There seems to be a whine from the rear end
It is not present when the car is under power, but is present when I lift off the gas and the car is coasting.
How about if you pop it into neutral as soon as you let off the gas? If it is there then it is the side wheel bearings in rear axle. if not then it is the pinion bearings.
 

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How old is the rear? Did it sit stationary for a long time in an "uncontrolled environment"? If the gears got rusty, they might make some noise.
 

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Could be a u-joint.
 

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I wouldn’t drink that.
 

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Pinion bearing or pinion support bearing loose allowing the pinion to "shuck" when contacting the "coast" side of the teeth.
 

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Discussion Starter #10
Pinion bearing or pinion support bearing loose allowing the pinion to "shuck" when contacting the "coast" side of the teeth.
U Joints checked out fine.
Assuming that you are right in what you say above, what is involved in solving the problem.
Very little experience with differentials.
 
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