New noise in 4wd....

Just thought I'd update on the noise and vibration issue I've been having in my truck.

I believe it has been narrowed down to the front drive shaft. With the front shaft removed and the lever in 4 high, no noise when driving, (so I think that rules out the transfer), and with the lever in 2wd and the front hubs locked, no noise, (so I think that proves it isn't in the front axle), Put the front shaft back in, and there's the noise and the vibration...

There is a little play in the front Uni, and my mechanic had the shaft balance checked and it isn't balanced properly.

So next week I'm getting the front shaft reco'd new unis and a rebalance.

Weird thing is that the shaft has a balance weight and shows no evidence of losing any weights, so I guess it's just slowly gone out of balance over the last 22 years and needs a bit of TLC.

Hopefully once the shaft is overhauled it will be all good again :-)

It would make a whrrrrring sound if it was the tail shaft and cause vibration as well
but get some new uni's and you have your fix hopefully, well done always a bugger finding
where a noise comes from

Quote:

---

Originally Posted by Patrol'n

Just thought I'd update on the noise and vibration issue I've been having in my truck.

I believe it has been narrowed down to the front drive shaft. With the front shaft removed and the lever in 4 high, no noise when driving, (so I think that rules out the transfer), and with the lever in 2wd and the front hubs locked, no noise, (so I think that proves it isn't in the front axle), Put the front shaft back in, and there's the noise and the vibration...

There is a little play in the front Uni, and my mechanic had the shaft balance checked and it isn't balanced properly.

So next week I'm getting the front shaft reco'd new unis and a rebalance.

Weird thing is that the shaft has a balance weight and shows no evidence of losing any weights, so I guess it's just slowly gone out of balance over the last 22 years and needs a bit of TLC.

Hopefully once the shaft is overhauled it will be all good again :-)

---

Beautiful..
I was wondering about that, that's why I mentioned it.
I should have replied it here instead of the "what made you angry thread"
Anyway, rebuild those uni joints, grease the slide and bolt it in..

Quote:

---

Originally Posted by biggqwesty

Beautiful..
I was wondering about that, that's why I mentioned it.
I should have replied it here instead of the "what made you angry thread"
Anyway, rebuild those uni joints, grease the slide and bolt it in..

---

Yep, it's being sorted tomorrow with a bit of luck, and then it's into 4 high to test it, then I reckon a track somewhere this weekend to test it off road...

Ok yeah that's just an excuse to go do some wheeling :-)

Quote:

---

Originally Posted by biggqwesty

Beautiful..
I was wondering about that, that's why I mentioned it.
I should have replied it here instead of the "what made you angry thread"
Anyway, rebuild those uni joints, grease the slide and bolt it in..

---

I'm not sure how they balance driveshafts.
I'm guessing 4wd specialized places have the gear for it?
If the uni has a play in it, I would blame it first.
Driveshaft balancing is a new domain for me.
I'm guessing they attach weights to it?!!
Not too sure how critical that's for the front drive shaft?!!!

Previously I thought an out of balance driveshaft is a replacement job!

Quote:

---

Originally Posted by dom14

I'm not sure how they balance driveshafts.
I'm guessing 4wd specialized places have the gear for it?
If the uni has a play in it, I would blame it first.
Driveshaft balancing is a new domain for me.
I'm guessing they attach weights to it?!!
Not too sure how critical that's for the front drive shaft?!!!

Previously I thought an out of balance driveshaft is a replacement job!

---

Yeah I believe that they replace the unis then attach weight to wherever is required to rebalance the shaft on a machine for that purpose, years ago I had to have a driveshaft rebalanced in one of my road cars, fixed it up nicely.
I reckon it's critical enough since it sounded and felt pretty bad when driving, although obviously worn unis wouldn't be helping.
Our family mechanic was able to quote for a brand new one for me, but the money tree must need some water, it didn't have that much on it!
Still, I do think it's good that you can still buy all these bits new if required for a 22 year old vehicle. I've tried to buy bits for younger vehicles many years ago, only to have to go to someone like Rare spares as they weren't made anymore. Of course they weren't Nissans, they were another make, another thumbs up for the GQ :-)

Mine were done at Driveline Australia in Welshpool, couldn't be happier with the result
The rear was shortened and front lengthened when Brunnies put in the 4L85 gearbox

Quote:

---

Originally Posted by the evil twin

Mine were done at Driveline Australia in Welshpool, couldn't be happier with the result
The rear was shortened and front lengthened when Brunnies put in the 4L85 gearbox

---

What engine are you running from Brunswick, the 6.5 Chev?

I can't see a uni rebuild needing a re balance though??
Bearings are a high processions item..
Balancing is more mods like lengthening the drive shaft etc..
Your local machanic will be able to replace the bearings easy enough..
I doubt you'll need a balance after but ask his oppion and where to send it..

Agree with Kallen.
Usually only need a re-balance if it is modified or damaged... haven't bent it by any chance?

If the money tree isn't flowering you could get the Universals done and drive it for a bit.
If it is all tickety boo then goodo but if you still have a vibration pop the shaft off and get it looked at.

Quote:

---

Originally Posted by Patrol'n

What engine are you running from Brunswick, the 6.5 Chev?

---

Yes