driveline problems

Hi Snowy, in all my years of 4WDriving I've never come across a problem like the one you have described. To bend a tailshaft the vehicle would have had to be involved in an incident where the tailshaft encountered a terrific amount of shock. Normally the replacement of Uni-joints shouldn't involve rebalancing & as you explain that there was no problem prior to the service. I would image that whoever did the service stuffed up the job of on the tailshaft. Cheers

Snowy came across similar problem the other day the customer sent his vehicle in for unijoints after he had a suspension lift. Uni joints were replaced by mechanic and vibration still there. On removal of tailshaft I had noticed the yolk end was bent from being hit with hammer to get uni caps out and and the uni was impossible to turn on the angles by hand. I had a new yolk fitted to the end and fitted more new unis and vibration gone.
Most driveline vibrations are caused by the following things:
1. Driveline out of phaze(Could be your problem)
2. Poor Driveline angle (Can happen after suspension lift)
3. Faulty Uni joints/Centre bearing/Bent shaft
4. Rear tyre Compound to hard causing harmonics back through tailshaft.

Cheers Worm.

I bet London to a brick the the hand brake is adjusted to tight.

Cheers Steve.

Hi Snowy,
one can get this problem if the yokes are re-installed 180deg out of alignment; ie, the shaft is factory-balanced for a particular alignment, and changing that will upset the balance.
I had the problem in a car once when I changed the uni joints and forgot to note the alignment before taking them apart.
Gerry

hi snowy

from what i understand you were driving your truck w/o vibrations and had uni joints replaced. After repair vibrations occur.

High probability it was yr mechanic not marking components. It is then next to impossible to reassemble them in correct/original positions and therefore for shaft to rotate in balance.

Very sceptical about mech sending your tailshaft out for a balance - sounds a bit like excuse number 321 - he was probably good enough to charge you for the balance too.

Nothing that should have been done to replace uni joint bearings should have changed a previously balanced shaft - a big hammer to remove bearings and incorrect assembly would of course be an exceptions.

Be interested to know if the handbrake readjust fixes the problem

hope this helps

Check your handbrake adjustment. I over did mine once and got similar symptoms. Might sound silly but it might just be the answer. Good luck, keep us posted with the result.