Hi Everybody,

Before I start this post I want to mention that I also posted this on the ForCBodiesOnly or FCBO forum as well. I’m trying to help out my stepdad here with the rearend in his ‘67 Fury with a 440 stroker and 3.23 sure-grip 8 3/4. The rearend keeps making a humming noise and gets worse the more you drive it at anything over 25mph. The pumpkin was rebuilt 3 times, this past time being built by a race shop next to my stepdads friends shop with new fluid put in each time. New stock tapered axle bearings were also put in too, and the car was jacked up and put in drive to precisely hear where the noise is coming from and nothing was heard. My stepdad is fed up with this car again as he always is, so I figured I would see what everyone else thinks is wrong with it.

Any tips are greatly appreciated.

Thanks in advance.

Are they reusing the same gear set?

Is the whining sound throttle sensitive?

Does it change on hard left or right turns?

Have you checked the driveshaft for balance and straightness? Another dumb idea have you checked the exhaust to see if it is hitting anything?

No noise while spinning in the air but but noise when tires are rolling makes me wonder.

Have you swapped out the back tires with completely different tires to see if you have a bad one?

Hi Everybody,

Before I start this post I want to mention that I also posted this on the ForCBodiesOnly or FCBO forum as well. I’m trying to help out my stepdad here with the rearend in his ‘67 Fury with a 440 stroker and 3.23 sure-grip 8 3/4. The rearend keeps making a humming noise and gets worse the more you drive it at anything over 25mph. The pumpkin was rebuilt 3 times, this past time being built by a race shop next to my stepdads friends shop with new fluid put in each time. New stock tapered axle bearings were also put in too, and the car was jacked up and put in drive to precisely hear where the noise is coming from and nothing was heard. My stepdad is fed up with this car again as he always is, so I figured I would see what everyone else thinks is wrong with it.

Any tips are greatly appreciated.

Thanks in advance.

If you had it rebuilt twice and the noise hasn't changed, it's time to look elsewhere......

I would take it to another shop next, what ratio is it?
Why does it have an earlier pre1965 rear end in it? 1964 was the last year Mopar used tapered axles in the 8 3/4 rear ends, 1965 and later should have the later style flat flanged axles in it without the tapered axles

He mentioned tapered axles bearings, not tapered shafts.

... and it's 3.23 gear .

No hum off the ground , if it's in the rear that would have me checking the axle bearings , is the endplay set right ?

Please explain rebuilt. New bearings and setup. Or used r & p each time.

It’s my understanding once a gearset is used at a certain setting moving the pattern may result in noise.

... and it's 3.23 gear .

No hum off the ground , if it's in the rear that would have me checking the axle bearings , is the endplay set right ?