[Spridgets] vibration at 35mph....and then some...

[Jim Johnson]

I had something similar going with my Midget a few years ago. It turned out
to be the bushing in the rear of the transmission going bad.  It had
actually worn the part of the drive shaft where it goes into the tranny so
badly that it was flopping around inside the tranny tail piece. I had to
replace both the front end of the drive shaft and the bushing and oil seal
in the tranny tail piece.  These two have to be properly matched or it will
happen again. I sent mine out to Paul A. in Oregon to have it done properly.

That said, I would follow Jay's advice and check your wheels and tires
first!  What you are experiencing could also be rear wheels out of balance
or even out of round or bent. Much easier to remedy than the drive shaft so
check that first.

Cheers!!
Jim

On Tue, Dec 8, 2009 at 11:49 AM, Edward Perez <eap2140 at yahoo.com> wrote:

> My car is experiencing a vibration at 35mph or so. It worsens if you
> try to go any faster. The mechanic's thoughts on this are that the
> drive shaft is at a severe angle causing the u-joints to bind. I have a
> 78 Midget with a 1275 and Datsun transmission. We recently installed
> the rebuilt motor (it was pulled and installed with the tranny). Has
> anyone experienced anything like this? Could there be an alignment
> issue with the way it was re-installed? The suggestions are to look for
> a lower transmission rear mount and install wedges at the axle. I found
> the 2 degree wedges at Summit and I'm wondering if I need 2 or 4
> degrees. Do I need to pull the engine and trans to install a lowered
> rear mount? The other thing he noted was that the yoke is bottomed out
> on the rear of the transmission leaving me no play for the suspension.
> Potentially causing bearing wear. My first course of action will be to
> take the drive-shaft to the shop for evaluation and shortening.
> Thoughts on how much I should shorten it? The U-joints are an unknown.
> They flop around loosely when the drive shaft is out of the car. Not
> sure if they are supposed to be firm. There is no lateral slop in them.
> This is never-ending. All I want to do is drive my freakin' car.
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--
Cheers!!
Jim
Only two things are infinite, the universe and human stupidity, and I am
not
sure about the former. - Albert Einstein