I just installed the ESPO 6 leaf springs on the 62 Valiant along with several other upgrades. I removed and re-installed the drive line to accommodate a drive line loop.

Now I'm getting vibrations that seem to be coming from the rear. I feel it as much as I hear it. My best description is driving the grooved asphalt on the side of the freeway, but about a 1/4 as intense. It appears between 50 and 60 mph. Bummer...

Where should I start to look? I

Thanks,

Barnaby

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These ones go to eleven...

Is the 'U-joint seated in the rear end ?

Richard

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Part of Tyrde-Browne Racing

Thanks Richard! I'll check.

Maybe the bad vibrations is karma paying me back for missing the races in Woodburn. Olga and I were bummed that we didn't make it.

B

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These ones go to eleven...

Is it worse under acceleration or coasting? Changing the leaf springs could have altered your pinion angle.

Did you have any work done to the driveshaft itself?

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

Remove rear end of drive shaft from rear yoke at axel and rotate 180 degrees, reinstall.

Did you remove one of the caps from rear u joint during project. One of the needle bearings could have gone missing which will make a "good vibration"...

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

I did not notice if acceleration or deceleration changed the intensity of the vibration. I might get to the car today and if nothing is visibly off I will rotate the shaft 180.

There was no work done to the drive shaft and I did not remove the cap.

Thanks guys,

B

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These ones go to eleven...

Can you explain this further? I ask because I'm having a similar vibration, albeit at a higher speed, after some driveline modifications. Would this be a good thing to try even if the U-joint is brand new?

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

Just an update and a little egg on my face. The drive shaft was not installed correctly. Now it is tight. It is possible that the pinion angle is incorrect, but I'll find out when I road test the car again, hopefully tomorrow.

Thanks for the input.

B

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These ones go to eleven...

I read this somewhere, and after having my drive shaft out for a spot of grease, unknowingly I installed it 180 degrees out, it made more vibration, and flipping it over 180* settled it back down. The grease also helped. A year later I did change out both U joints, but indexed the rear joint to go back as it was.

The tail shaft bushing is a bit worn allowing some vertical motion of front yoke which I suspect allows some vibration that tends to crop up around 62 mph.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

Resolved and no vibrations. Correct installation makes a huge difference!

Thanks for the help,

B

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These ones go to eleven...

Huh. I didn't know you could be 180 off. I'll try flipping mine and see if it improves.

_________________
Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing