GQ Tailshaft Vibrations???

Submitted: Thursday, Sep 18, 2003 at 23:17
ThreadID: 7305 Views:4423 Replies:9 FollowUps:6
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Hi all, I have or suspect what seems to be like a tailshaft vibration at around the 95-105 kmh mark. I have replaced both rear uni's, checked the nuts on the transfer and diff flanges, had wheels balanced and the car has approx 60mm lift and its a l.w.b. TD4.2
The tail shaft has no signs of damage either to throw it out of balance.
Any ideas where to look next???
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Reply By: Truckster (Vic) - Thursday, Sep 18, 2003 at 23:31

Thursday, Sep 18, 2003 at 23:31
Is the vib right thru the car?

Your caster angle could be out, but a small lift like that in a LWB shouldnt make any difference.

Were the Unis installed correctly? Was the vibs happening before the unis went in?

Check your bushes in the front end?

Gearbox and engine mounts?

AnswerID: 31476

Follow Up By: Member - Eric- Friday, Sep 19, 2003 at 08:20

Friday, Sep 19, 2003 at 08:20
Truckster , I had the same problem in my shorty when I lifted it . I fixed the problem with some spacers under the G/box crossmember , you can buy them at any arb store Craigs hut 2003
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Follow Up By: Truckster (Vic) - Friday, Sep 19, 2003 at 15:53

Friday, Sep 19, 2003 at 15:53
Shortys are differnt to LWB I have 6inch lift with no vibs... No spacers.

LWB's usually can go higher than shortys with less complications due to tailshaft lengths. Shortys go 4inch is usually around the best you go with little issues.
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Reply By: Member - Andrew(WA) - Friday, Sep 19, 2003 at 00:16

Friday, Sep 19, 2003 at 00:16
Aussie

I had a GQ wagon 1993 5sp 4.2 injected petrol.

I has the same problem. I hope your problem is not what mine turned out to be but here's my story..

Vibration was in 4th and 5th gear above 80km/h

I'll give you the short story but I endured a long and frustrating info search with Nissan Aust and my local dealerships.

I eventually found an experienced Nissan workshop foreman who was sympathetic to my cause and gave me a bit of info.

He told me that 'some' of the Patrols were experiencing this problem and it was brought on by the gear box. A possible remedy was to rotate the drive shaft to a different position, drive it and see how you go. (all up that means 16 different possible positions for the shaft.) ie 4 bolts at the front x 4 bolts at the rear.

Anyway, the dealer did it for me to try and resolve the problem. When I got it back, the good news was that 4th gear was now smooth but 5th, they couldn't work out.

I tried to fix it my self by rotating the shaft, had it professionaly balanced,,,you name it. NO JOY. I even did the Uni joints as you stated.

After getting friendly with the foreman, after many conversations with him, he told me that Nissan knew about it and had had engineers from Japan over in Oz trying all soughts of things to try and fix the prob. The short story from here is they couldn't find a way and the reason for the vibration is the spline shaft on 5th. It somehow goes out of centre and just gets worse.

Evidently they have replacement shafts which were manufactured and 'balanced' to replace the buggered ones. I was quoted $2800 back in 1999 to do the fix. The scary thing was that they would not guarantee the work. I couldn't believe it.

It was obviously well out of warranty by the years, but only had done 122000k's.

Rather than taking the risk, I traded the car to a dealer who test drove it under 80km/h and thought it was great.

So I know that's not what you wanted to hear but it may give you somewhere to start.

GOOD LUCK.
AnswerID: 31479

Follow Up By: Member - Andrew(WA) - Friday, Sep 19, 2003 at 00:19

Friday, Sep 19, 2003 at 00:19
P.S.

I pleaded my case with Nissan Aust re doing a 'you pay a bit and I'll pay a bit too' thing....

They politely told me to go away.
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Reply By: zigglemeister - Friday, Sep 19, 2003 at 07:31

Friday, Sep 19, 2003 at 07:31
Hi Aussie,
Check that the unis at both ends are aligned with each other, ie when two of the four "spokes" (what are those things called, anyway???) are horizontal on the uni at the diff end, two are also horizontal at the transfer end.
Tim Z
AnswerID: 31488

Follow Up By: zigglemeister - Friday, Sep 19, 2003 at 07:33

Friday, Sep 19, 2003 at 07:33
Also, an easy way to make sure that it is in fact the tailshaft and not something else, is to remove the tailshaft altogether, stick it in 4WD and go for a spin in front wheel drive, and see if the vibration goes away.
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Reply By: Bob - Friday, Sep 19, 2003 at 21:34

Friday, Sep 19, 2003 at 21:34
Hmmmm more Nissan problems!
AnswerID: 31539

Follow Up By: Flash - Saturday, Sep 20, 2003 at 10:54

Saturday, Sep 20, 2003 at 10:54
You are pathetic, Bob.
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FollowupID: 22486

Reply By: Member - Bigbear - Saturday, Sep 20, 2003 at 18:48

Saturday, Sep 20, 2003 at 18:48
I had a vibration problem in my GQ at around 85kph tried balance and alignment but didn't help.
Tyres where about 40% so I bit the bullet put new tyres on and no more problems for the last 50,000k's.
Just my two bobs worth.Bush Bappo's 4WD Club
Get out there & have a look
AnswerID: 31574

Follow Up By: Bonz (Vic) - Friday, Oct 17, 2003 at 23:10

Friday, Oct 17, 2003 at 23:10
NOT TWO Bob's ANYTHING BUT TWO Bob'sLaterally Literal
Seriously Cerebral
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FollowupID: 24648

Reply By: Truckster (Vic) - Saturday, Sep 20, 2003 at 19:49

Saturday, Sep 20, 2003 at 19:49
Try someone elses tires and rims.
AnswerID: 31584

Reply By: David N. - Sunday, Sep 21, 2003 at 15:07

Sunday, Sep 21, 2003 at 15:07
Also,
Tailshaft, if the cause, is quite high frequency compared to tyres, wheels. I had tailshaft vibes many years ago in a Kingswood V8 which took a bit to cure...
I like the idea of taking it for a drive without the rear shaft in place....
I've also had tyres on another vehicle (not 4WD) which were out of round and out of balance- you could take them to a tyre shop till you were blue in the face and they'd be different every time. New tyres fixed the problem- they paid!
Cheers- and good luck.
AnswerID: 31614

Reply By: Aussieducker - Monday, Sep 22, 2003 at 18:37

Monday, Sep 22, 2003 at 18:37
Thanks all for the ideas,
Just to add some more, the uni's were installed correctly, the rims are new, and it still vibrates on different rims and tyres and even tried it with the a heavy load in the rear to drop the height a little. I'm trying another tailshaft to see if its worth getting it balanced or not. Hope its not the spline as mentioned above.
AnswerID: 31693

Reply By: REX - Friday, Oct 17, 2003 at 17:15

Friday, Oct 17, 2003 at 17:15
I HAVE THE SAME PROBLEM WITH MY 94 PATROL . MY VIBATION COMES IN AROUND 105K AS OF YET HAVE NOT BEEN ABLE TO FIND CAUSE OF PROBLEM HAVE CHANGED UNIS AND CHECKED ALL MOUNTS ITS A VERY DEEP VIBRATION COMING THOUGH FLOOR PAN UNDER MY FEETAND PULSES ????
AnswerID: 34185

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