Tailshaft allignment

[GUtripper]

On a 100 series (1998 Auto Petrol etc) we have a wierd vibration/rumble like a harmonic vibration at about 90k's in overdrive.

All was checked out, appeared to be the transfercase, looked like it may have been an output shaft bearing.
Transfer was changed, vibration/noise still there. Bugger.

Have noticed with rear tailshaft, the uni's are in allignment.

On the front tailshaft, the uni's are at 90 degrees to each other. Is this normal? Should we pull the shaft apart at the slip joint and allign the uni's on the same plane?

[joel HJ60]

The uni's should be aligned or 'in phase'.

In phase means the uni's are aligned and speed fluctuations (vibrations) at one end are cancelled out at the other end.

Is it AWD? If so it may be the front shaft. If not, I don't think it would matter too much as when 4WD is engaged the critical speed of that front shaft wouldn't be too high.


I hope that's right

[vk7ybi]

Take the front shaft out and try again, process of elimination.. Does the front shaft have a double cardan joint at the transfer?

[GUtripper]

Yeah, its constant awd. We are thinking of getting a freewheeling hub kit/Marks etc.

No it doesnt have a double cardan joint, just a uni at each end.

I will drop the front tailshaft and allign the uni's (will mark the current location of the slip joint first) and see if that helps.

[Sic Lux]

Some good tech here on phasing and how the cardin joint works
http://www.pirate4x4.com/tech/billavist ... ndex2.html
If the 100 has abs 2wd kit will disable the abs system.