[DpnzonDaBnz]

Is is possible to tell whether your driveshaft is balanced without removing it? Can you be sure all brackets and supports are OK just by eyeballing them?

I'm interested in vibrationless high speed driving.

Thanks

 

[MBZER]

Whats a flex-disc ????

 

[andrew_falky]

A flex-disc connects the driveshaft at two points: rear diff. and crankshaft. It is an interface connect made of hard rubber. However, that was not the original question of this link. I don't know how to check if a driveshaft is balanced.

 

[jdc1244]

I’m not aware of drive shaft balancing issues – as Andrew correctly noted above check the condition of the flex discs and the drive shaft bearing, replace if needed. My experience with high-speed vitiation has been related to tire condition/balancing/alignment, front-end suspension components, drive train mounts and shocks, and chassis bushings such as the subframe mounts.

 

[spectrumrt]

Ah!

Just discovered this posting - excellent!

Was driving at 115Km/Hr last night on the freeway (our speed limit here, though sometimes I push it like the car likes) :-D and noted the high speed vibration.

My immediate thoughts were:

a. The rear tyres are shot - all tyres being replaced this week.
b. Wheels need a balance and alignment badly - especially after a lower ball joint replacement last week. Again, all this is being addressed this week, so I'll test this theory and report back.

My trusted mechanic I would think would have pointed out bad flex discs or other concerns already upon last inspection, so I don't think I have any concerns there...

 

[Guest]

I must admit while walking a ZO6 Corvette last night with relative ease my higher speed jaunts were quite smooth. Much better than the last 420 we were testing. Nothing worse than a shimmy at high speeds.

I have found that when getting into tangles with other higher output vehicles it is always best to get the jump on them. Thats why I dont mess around. Still I yearn for a wee bit more.

Best of luck finding that shimmy. I would try the new tires and balance however if that does not take care of it you could be due for a set of bushings. Flex disc's must be inspected for cracks. It is WAY PAST time to change them if you can see string looking frey.

Also important are the brake support bushings, and rear sub frame bushings. I have seen these cause a shimmy.

And last but certanly not least, "A good alignment when all is said and done" and you will be back in business.