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Front diff harmonics

Posted: Sun Oct 01, 2017 4:19 pm
by audiocontr
Recall the sound of an unbalanced drive shaft, as it pulses while driving at speed, back and forth... The haflinger makes that sound. It always has. I'm positive its in the front.

Would too much fluid in the center shaft cause this?

Re: Front diff harmonics

Posted: Sun Oct 01, 2017 5:44 pm
by audiocontr
Is it possible that its a whistle across any of the drain holes?

Re: Front diff harmonics

Posted: Mon Oct 02, 2017 1:49 am
by Heinkeljb
I think it is far more likely to be a slightly bent drive shaft due to slightly worn fulcrum pins. That will load a bearing on one side and cause a bit of noise which then because the shaft can go up and down, the loading will change.
Lurch does the same thing, so I would guess it is quite common.

John

Re: Front diff harmonics

Posted: Mon Oct 02, 2017 8:28 am
by TechMOGogy
That was my 1st guess too for a noise like that - bearing(s)

Re: Front diff harmonics

Posted: Mon Oct 02, 2017 10:13 am
by audiocontr
Thanks gents!

Re: Front diff harmonics

Posted: Tue Oct 03, 2017 9:45 pm
by Jimm391730
Check if the "pulses" happen at wheel rpm; an out of round or bent wheel will load and unload the drive train as its radius changes.