I’m trying, unsuccessfully so far, to cure a vibration on my 1955
MVIIM, 4-spd O/D. Briefly, the vibration is speed, not RPM
related. By my speedo, it vibrates noticably around 40-45 MPH.
This is felt in the seat, etc., not the steering wheel, and the
vibration stays even while coasting downhill with the engine
shutoff in neutral. The other day I disconnected the rear flange
from the diff, tied it out of the way, and coasted down a long hill
at highway speed. The car was smooth at 40-45. Then I put the
frame on blocks, disconnected the front flange from the O/D, and
ran the engine in 4th gear up to 60. No vibration. I have a 2
piece driveshaft. I’ve replaced and professionally installed 3 U-
joints, the center bearing, and have put new rubbers in the bearing
mounting. I needed a new rear flance due to wear, and part of my
shaft was replaced due to an out-of-round condition, I guess. I’ve
had the driveshaft balanced and rebalanced. In both cases, the
shop added weights where there were none before. In fact, I now
have 1 weight on the rear shaft and 2 weights on the front (short)
shaft. Their balancing machine is calibrated to spin at 600 RPM at
which speed my car is smooth anyway, so I asked them to spin it at
1200. My vibration occurs in 4th gear around 2000 RPM and can’t be
felt above 2500-2600. The tires are new Michelin MXV4 radials.
Tire pressure is at 36 PSI. I’ve spent over $500 on this issue and
can’t ask the driveline shop to do any more. I can either assume
they did a poor job and have the driveshaft checked elsewhere, or
appeal to Jag-Lovers for advice. Spinning my wheels!!
ASC, JANE–
asc
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