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Rear end heavy vibration


Old 12-28-2017, 07:17 PM
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Default Rear end heavy vibration

Been having trouble with my 944 S2 lately thought I would ask you if you encountered such a problem :

The car vibrates and rather shakes from the middle to the back under load. In all gears.
Basically in second gear you give it gas rpm 2500 and up it starts to vibrate and increases to shake as you keep going
Same in any gear.

And absolutely nothing when clutch is engaged or in neutral even in high speed.

Only when you press the gas pedal !

I changed the torque shaft bearings
Changed the transaxle Mount
Changed exhaust mounts
Checked Cv Shafts

Still facing the problem.

Any ideas ?
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Old 12-29-2017, 05:37 PM
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Sounds like something I went thru decades ago. I found that the rear axle bearing races had cracked.
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Old 12-31-2017, 01:53 PM
boost feen
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When you say checked the cv joints did you ramove them from car and completely clean grease out then inspect ***** and outer/inner couplers Cause there pretty hard to gauge when you just roll them around with dirty grease in there.

If yiu have sone this and know the cv are good then wheel bearings and or bad rubber tires flat spots on tires from sitting or out of balance wheels?
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Old 01-01-2018, 03:43 PM
Wisconsin Joe
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Is this a new problem, or has it been there a while?
Has it slowly gotten worse, or all of a sudden?
Only under load, not when you lift off the gas or press the clutch pedal (to be a bit pedantic, pushing the pedal disengages the clutch, releasing the pedal engages it)?
Totally speed related (varies with speed only - as in same at 45 mph no matter what gear you are in)?

That is typical of worn CV joints.
As was said, you can't really "see" this without taking out the half-shafts and taking the CVs apart.

Just about everything else that I'm aware of (bad bearings, flat spotted tires, bent wheels, ect) would be there no matter what, not just under load.
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