santts
Member
Humming while diving my 65 Fury . Humming in rear . Diff fluid is up to level . I’m assuming bearings? 8 and 3/4 rear
Humming in rear while driving
- Thread starter santts
- Start date
How long as that sound been back there? Might just be normal high-mileage wear on the gears.
Wheel bearings sound will be different. You can change bearing sound by swaying the car side to side, loading and unloading the affected rear wheel bearing.
Get a hand suction pump and change the rear axle lube, not just make sure it is to the threads on the housing.
Just some thoughts and observations,
CBODY67
Wheel bearings sound will be different. You can change bearing sound by swaying the car side to side, loading and unloading the affected rear wheel bearing.
Get a hand suction pump and change the rear axle lube, not just make sure it is to the threads on the housing.
Just some thoughts and observations,
CBODY67
Yeah that sway side to side is a good test but not 100%.
One time I worked on a guys car, we thought for sure the gears were toast, very noisy. Had a rusted up wheel bearing. Zero noise with one bearing replaced and other side checked and repacked in grease.
One time I worked on a guys car, we thought for sure the gears were toast, very noisy. Had a rusted up wheel bearing. Zero noise with one bearing replaced and other side checked and repacked in grease.
santts
Member
santts
Member
I’m hoping I can just repack and move on. I haven’t done back bearings since I’ve owned it . This is yr 4. I’ll keep ya posted .
Gerald Morris
Senior Member
I had to replace the axle bearings on our '66 the first year we drove it. Would get bearing buzz when making curves, which worsened a bit over the year. Got us a good kit from Dr. Diff w Timken bearings, which put things right for that rear end. I might rebuild that 2:76 rear end and put it back on some vehicle. So long as the oil seals hold up, good bearings last a long time.
Gerald Morris
Senior Member
If you're going through the trouble to pull those bearings out, it might be good to replace them, unless they're in really good shape. They cost, but it isn't prohibitive.
moparnutcase
Senior Member
When I had my ‘65 Monaco I had a rear hum for years. It would go away when I made a turn or curve in one direction. Finally looked into it and it was a bad right rear axle bearing. Funny thing is after I had it replaced the car had way more jump off the line because it wasn’t hanging up anymore!
santts
Member
I looked into it a little bit so far. What I noticed was who ever filled diff put to much gear oil. So I unthreaded plug and watched oil till it almost stopped . Put plug back and tested. Much quieter and no dampness near diff ( as their was prior). Due to overfill I believe. Still gonna suck out rest and put new and and motor craft friction additive .
santts
Member
I mean it looked a little dark but no noticeable metal shavings. I’m happy about that .
Just thinking about this.... If the oil level was too high, the oil could be up at the level of the axles. If that was so, there's a good chance of it getting past the axle seals and leaking onto the rear brakes. Possibly washing the grease out of the bearings too.
I'd pull the rear drums and check the rear brakes at minimum. If they are wet, pull the axles and regrease the bearings.
Gerald Morris
Senior Member
VERY SIMILAR to the case with Mathilda. It was the right axle bearing on her, so I replaced both of them to preserve optimal symmetry. Sure enough, old Tilly would sing on the curves before her surgery, but after, she did better on the hop! The Big Hint came when I saw oil on the brakes, but that hum and whine would come when taking her around left curves.
Does the noise change between accelerating and decelerating? That would indicate a gear problem. A steady rumble or roar, axle bearings, or on rare occasions, carrier bearings. Pinion bearings could also do that, but, usually you're see a leak at the seal too.
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