Brake Drum Wobble

[marks86]

My truck is still shaking, I narrowed it down to the rear end.... WIth the rear end of the truck on jackstands with the tires OFF the truck the drums are wobbling back and forth has anyone ever hurd of this issue?

 

[82chevy350]

see it the axle itself wobbles

 

[marks86]

The housing or the axle shafts?

 

[MrMarty51]

Install three spacers on three of the lugnut studs, install three lugnuts to the three studs, tighten them down, see if they still shake, or wobble. unless this is a FF rear differential the hubs will not be properly retained, then spring clips from the factory is not enough.
If the wobble is still there, then I`d be suspecting a tweakeded axle shaft.
Remove the lug nuts and spacers, remove the braking drums, start Your enjun, put it into drive, observe the axle flange, does it wobble ????

 

[marks86]

Install three spacers on three of the lugnut studs, install three lugnuts to the three studs, tighten them down, see if they still shake, or wobble. unless this is a FF rear differential the hubs will not be properly retained, then spring clips from the factory is not enough.
If the wobble is still there, then I`d be suspecting a tweakeded axle shaft.
Remove the lug nuts and spacers, remove the braking drums, start Your enjun, put it into drive, observe the axle flange, does it wobble ????

it is a corporate 14bff

 

[89Suburban]

Take the drum off and see if the hub is wobbling

>edit<

Oops, full floater hmm...any play in the bearings when you shake it?

 

[marks86]

Take the drum off and see if the hub is wobbling

>edit<

Oops, full floater hmm...any play in the bearings when you shake it?

just retorqued the bearings still doing the same thing

 

[chengny]

Do you mean there is looseness in the drum (that you can wobble it with your hands)?

Or are you talking about runout (as the axle is rotated the drum can be seen to be moving in and out but it is still rigid to your hands)?

Is the motion in an up/down direction or does the drum appear to move in and out?

If you remount the tire and shake it - does it have play in any direction?

 

[marks86]

Do you mean there is looseness in the drum (that you can wobble it with your hands)?

Or are you talking about runout (as the axle is rotated the drum can be seen to be moving in and out but it is still rigid to your hands)?

Is the motion in an up/down direction or does the drum appear to move in and out?

If you remount the tire and shake it - does it have play in any direction?

Yes I would considered runout it happens when The truck is on jackstands and the truck is in gear.. it shakes pretty violently at forty mph

has no play in it..this is with the tires off

 

[chengny]

The axle shafts are supported and stabilized by 2 sets of bearings:

The outer ones (located in the hubs) - wheel bearings. And an inner set (inside the differential where the axle shaft mates with the ring gear) - the carrier bearings.

Since you feel that the outer bearing sets are tight, the next step is to check the carrier bearings.

Drain the gear oil from the differential and remove the cover. You'll see where both shafts enter from the left and right. You'll also see the bearing caps that hold the carrier bearings in place. Here they are with the caps removed:

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With the rear end up on stands and the differential cover off, start the engine. Put the gear shift in drive and crank the idle up a bit. Go back and look inside the differential.

See if you can notice the ends of the axle shafts moving in any direction (other than rotating - duh). They should be stationary. Same goes for the carrier/ring gear assembly it should be rotating smoothly. Have an assistant rev the engine a bit to test at higher speed.

Don't worry about lack of lubrication , you can safely do this procedure for extended periods - as long as the wheels are up

Take your time and watch closely. Shift the transmission into reverse, watch for free play and then shift back to drive.

Any runout, wobbling, up/down or back/front movement is an indication that the bearings are played.

If everything seems tight - IDK.

Make sure you inspect the inner face of the drive shaft flange where it makes up to the brake drum and also check that the gasket is flat and smooth:

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Both of these surfaces are designed to be machined flat and true. Any excessive rust/debris that gets between them will cause the drum/wheel/tire to run untrue.


Here is an exploded view of your axle:

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[marks86]

thank you for the help I have some disc brake parts on the way I will check this soon

 

[marks86]

so I rebuild rear end with disk brakes and a mag hytec cover looks badass but anyways truck shakes worse now go figure....turns out its the tires I guess the balancing beads I used weren't enough? I hope its not a cord..on my way to get them balanced will give update