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Hi,
I will have to say things are sounding very weird here.
You said the shaft seems to bent at the splines.
That makes it even more interesting as that it is an assembly made to compensate for the rise and fall of the axle.
I’m sure they must align smoothly as they do go back together greased.
It might be possible that bend is causing a flopping instead of an out of balance.
I spoke to the ends of the shaft not running parallel but blew it off as all is rubber mounted under the car.
How badly does it run out? Was it by sight or measured with a dial indicator. They should have told you the amount. By sight they should have stopped right there and not try to balance it, IMHO.
It’s one thing to be out of balance of weight but trueness is another issue.
The lopsided motion tied in with joints allows the mass to move up and down the axis rotating member.
I know it’s hard to imagine but the closest thing that I can describe it to be is like trying to spin a rope from one end to the other and then putting a drag on the other end.
The rope tends to bunch up and then release it’s stress along it’s axis.
The twisting effect moves and no balancing of any one area can compensate it away. At various speeds it becomes compounded dynamically.
Balancing deals with fixed densities and therefore fixed weights work.
There are such things as semi-fluid weights used to help FWDS front wheels and some commercial appliances but that’s leaning towards some exotic applications and induced harmonics.
I think that’s what you are referring or trying explain how the vibrations are changing.
This might explain the occasional vibrations coming and going with road surface changes let alone variations in torque.
Do you have something loose inside the car thats a tell? The upright portion of a passenger’s front seat is one good indicator.
When you keep mentioning the front end struts affecting the rear shocks?
There are the rear torque supports rods and then the panhard rod that goes across the rear axle.
It is seldom a problem but controls the twisting side to side up of the axle up under the body, but then so do the trailing arms and shocks.
So, This is where I’m lost as this is a 700 and not a 240. I’m truly a fish out of its pond!
The thought has jumped, like a fish in my mind, that you might have a bent rim and you are moving the wheels. Especially, around while changing axles.
This could be adding more weirdness to either the front end or the rear of the car.
I keep thinking the vibration must be rather severe for you to keep picking up on it.
This is just a “feeling” I have towards the 700 series body.
It was a rendition style to grab some of GM’s customers, yet at the same time, may have picked up on Chrysler’s K body as way of doing experiments.
I can remember hearing about Nivomat suspension systems being a mess.
Did your car start out that way?
Sure hope you find the weirdness as this is interesting!
Phil
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