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As part of my gearbox project I decided to check a few things to make sure it was still all in spec - panhard adjustment, pinion angle and tailshaft balance. Shaft already had new uni's so I just wanted the balance checked.

So off I went to the local tailshaft service, and low and behold, it was bent. This is common I am told, as they are quite thin, and even a small bump will put them out of round. My vehicle does not do any serious 4wding, and to my memory it has not taken a hit of any substance. The repair consisted of heating and shrinking, as you would a stretched body panel.

So for those of us that like to go fair dinkum 4wding, does anyone have a heavy walled shaft to protect it from small bumps? Seems like the stocker is not very strong, and would not take much of a hit.
 

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Wow, there's something I would not have thought to check! I wouldn't be surprised if many of us have bent shafts then, seeing as they are pretty easily bumped.

I take it that you only did the rear shaft?

Thanks for adding this to the forum.


Sent from my iPhone using Tapatalk Pro
 

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Have you ever tried to find where that shake is coming from, had the tries balanced to the ninth degree, and its still there in the background.

You might just find the its a out of balance tail shaft!
 

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And I have had mine done previously, some years ago. So I cannot blame an incident before I owned it either.
 

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Have you ever tried to find where that shake is coming from, had the tries balanced to the ninth degree, and its still there in the background.
Out of balance tail shaft feels completely different to an out of balance tyre. Much higher speed of vibration. Once you've felt it you will never confuse it with wheel balance.
 

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If I’m wanting to eliminate the rear tail shaft As a cause of any vibration can I just take it out and run in 4wd using the front wheels for drive?
 

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1989 GQ TD42 wagon
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If I’m wanting to eliminate the rear tail shaft As a cause of any vibration can I just take it out and run in 4wd using the front wheels for drive?
Yes. Remember to put the nuts back on at the transfer case end to prevent the handbrake drum from working its way backwards and eventually falling off.
 

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If I’m wanting to eliminate the rear tail shaft As a cause of any vibration can I just take it out and run in 4wd using the front wheels for drive?
You can but it might be easier to just jack things up so the back of the frame rails are on body stands with the rear axle hanging clear of the ground. Put in in top gear 2wd and give it a rev. Any driveline imbalance will be quite noticeable.
 

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You can but it might be easier to just jack things up so the back of the frame rails are on body stands with the rear axle hanging clear of the ground. Put in in top gear 2wd and give it a rev. Any driveline imbalance will be quite noticeable.
I think I’ll stick with option A 😂🤣
Can imagine things going wrong if I did it,lol
 

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Driveshaft is off and I’ll see how it goes when I’m out this avo but I double checked the angle of the rear diff and at the front with it off and worked it out as 2.3 for the front and 3.2 for the rear, is that 1° enough to cause an issue? I have had it checked previously and theyve said it was ok and I’ve also done it myself but I found both ends to be the same so 🤷‍♂️
 

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Just went to drive it and no drive to front wheels 🤔 don’t have time to mess around with it now but what have I done wrong or what is wrong?
 

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Discussion Starter #13
If the hubs are locked then it does not sound good for the transfer. Assuming your linkages have definately moved the transfer selector.
 

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Well who’d have thought that locking the hubs in would make a difference 🙄😣🤷‍♂️
For some reason I wasn’t thinking of that this avo, I’ll put it down to the heat and humidity and sweating my ass off under the patrol beforehand trying to adjust the upper control arms.
took it for a drive and apart from a bit of rattling, which I presume is coming from the handbrake drum, the vibration is gone so I guess the only question is is it the 1° difference that’s causing it or is the shaft itself unbalanced.
 

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Bad uni? Worst case, new unis and get the shaft rebalanced at a tailshaft specialist.
Possible, I can gat the flange angles right if the damm upper control arm will play ball with me, threads have seized so I’ll give them a spray with some penetrating oil tomorrow and as the shaft is out it should be easy to drop off at a specialist for them to balance.
 

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Hi Team,
link is to a calculation formula and method of measuring drive line angles.


As will be noted the drive shaft angle is used as well as the two flange angles to calculate the actual operating angle differences.
I stand to be corrected---other link explains by demonstration the effects of missmatched or excessive angles.


Hope this helps.
Cheers,
Eddie B.
 

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Possible, I can gat the flange angles right if the damm upper control arm will play ball with me, threads have seized so I’ll give them a spray with some penetrating oil tomorrow and as the shaft is out it should be easy to drop off at a specialist for them to balance.
Although things will be worse if the driveshaft angles aren't correct, I was thing about plain old wear and tear. How many kms have you done on those unis?
 

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Although things will be worse if the driveshaft angles aren't correct, I was thing about plain old wear and tear. How many kms have you done on those unis?
It’s up to 350,000ks now but the issue only started to appear after I put the lift in and raised it to 3-4in so I’m still thinking it’s more an angle problem but they’ll be able to check both if I find somewhere to take it too
 

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It’s up to 350,000ks now but the issue only started to appear after I put the lift in and raised it to 3-4in so I’m still thinking it’s more an angle problem but they’ll be able to check both if I find somewhere to take it too
Does either uni feel loose? Or notchy when you flex it through its full range of travel? Any yesses to either question means time for new unis. After 350,000kms it's probably worth doing anyway. Just make sure whoever installs them gets the grease nippkes in line with the slip joint nipple. One of mine faces the wrong way, and its a PITA come service time.
 
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