2 zones of vibration.

[Kurt in NJ]

When you had it up on stands take off the wheels, this will eliminate tires

[grumppyoldman]

While you have the rear end jacked up with the tires off, look at the brake drums inboard at the back plates to see if you have any run-out in the drums. I had a bent shaft on passenger side. Fixing that now, hope vibration goes away. Just a thought, maybe your drive shaft is bent also. Al

[Lawrie]

Rob,I straightened it my self, I set up a dial indicator on the other end of the shaft I used my welding torch to heat up a small hot spot ,on the low side , about 3/8 dia,and cooled it with the coolant from the lathe,
It was an easy job ,and it's been in the 33 now for 1000,s of klms and is as smooth as.
Another thing I found was the four fitted bolts that hold the u/jount ball onto the back of the tranny were loose in there bores,this allowed the u/j ball NOT to be concentric with the tranny output shaft I fixed that as well,
I,m away from home in the 33 at the moment but when home could shoot you some pics of that fix.
Lawrie

[RobR'35]

Thanks guys. When able I'm going to check each thing suggested.
Lawrie: When ur able I'd like to see those picks.

[1931 flamingo]

Part way thru this thread I thought tires also. FWIW
Paul in CT

[Clem Clement]

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Jack it up and run it without the wheels?

[Mart]

Anyone near you with a set of wheels and tyres that would be prepared to swap? (temporarily for the sake of testing).

Otherwise, you might try this:

If you can find a suitable piece of quiet, smooth road, and drive to a speed above the vibration zone, select neutral and turn the engine off. If you feel the vibes in the usual speed zones as before, you have ruled out the engine from fan to flywheel, including clutch and the input side of the transmission.

If you feel the vibes, (as mentioned above) you need to judge the frequency. Low frequency = wheels/tyres/drums/hubs/bent axle shaft. High frequency = drive shaft/ uj.

Sideways movement in the uj is perfectly normal. This is to compensate for any axial misalignment between the trans and the driveshaft/torque tube.

Mart.

[RobR'35]

When I rebuild the rear axle I put new races and nos wheel bearings in.
Is there a certain amount of play I can expect to see?Hub to bearing to axle housing stub where the race is pressed on.

[supereal]

You didn't mention the center bearing, unless I missed it. It is normally held in position by a rubber case and the grease fitting. If it comes loose, or for any other reason, it causes driveline vibration, particularly if the coupler alignment is off by a very small amount. At our shop, when weld a coupler to the driveshaft it is done in our long bed lathe, and first tack welded into position to prevent heat warpage as it is welded. Then it is checked with a dial gauge to be sure it is in line.

[cas3]

tubular drive shaft

[RobR'35]

Yes. It's the tube drive shaft.
I do need some insight on what kind of rear wheel bearing ply I can expect. Look at post 28 please.

[rich b]

Does the speed range of the vibrations change with rear axle in low vs high?

[RobR'35]

No. Same in Ford gears and in Columbia OD.

[RobR'35]

Today I jacked up the rear and ran it without the wheels/tires on. I didn't feel the vibration in the ranges I've mentioned before. It's looking like it's tires/wheels doesn't it........
I also used a dial indicator in the bottom of the drums and pushed up on the axle nut area to see what sort of play there was in the wheel bearing to hub to race on axle housing. All new bearings and races like I've mentioned in a past post. .008 - .009 play both sides.
What's the +/- range I should have?

[JSeery]

Originally Posted by RobR'35

I also used a dial indicator in the bottom of the drums and pushed up on the axle nut area to see what sort of play there was in the wheel bearing to hub to race on axle housing. All new bearings and races like I've mentioned in a past post. .008 - .009 play both sides.
What's the +/- range I should have?

I have no idea, but that seems like a lot.

[RobR'35]

I've looked through a mess of manuals and books.
I didn't see a spec. for this.
Anyone have any insight experience with this tolerance?
Wheel bearing to hub to axle housing stub where the race is spressed on.

[Mart]

You're measuring something that no-one else has measured. That's why there isn't a spec. it's also hard to envisage exactly what you are doing. The bearings are non adjustable. It is a broad faced roller bearing. It is what it is. The rear wheel bearings are not the cause of your vibration.

Mart.

[RobR'35]

I realize they are not the reason for vibration.
Just something in the process I figured would be good to know.
Ordered new tires last Fri.. should be in on Wed., Thur.
I'm curious what'll be the result.

[1931 flamingo]

Your post #34................................How tight are the axle nuts??
Paul in CT

[RobR'35]

220 ft. pounds. I laped the axle shafts to the hub's when I rebuilt the assembly this past winter.
7/8 ths contact.
Took it for a short spin then checked the torque again.
It did loosen a bit. Torqued it again. It's not moved since.