Help - Vibration

Could be anything................

1. Exhaust vibration at speed
2. Loose pasenger seat
3. Wind on snorkel/aerial
4. Wind on loose mudflap
5. Tyre noise
6. Loose universal bolt
7. Wind in bullbar

The list could be endless....lol

Cheers

My Prado has the same thing around 110/115k and mainly once the torque converter has locked up but would class mine more of a drone type thing than a vibration. Apparently more common in the series one prados in V6 form. Once I put the boot into it so the torque converter cuts out the sound/feeling goes. I just turn the cd up a bit more. But have driven other prados with the same thing so I know mines not a one off. Even thou yours is manual might be the same sort of thing. I suppose the only way is to change the muffler and see whether that stops it or not but an expensive way to go if it doesn't. Id be looking more at the exhaust then anything. If you are in say 5th gear at 90/115 and putting the boot down have you tried say whacking it back into 4th just to see if buy doing that you are changing the revs obviously upwards from say eg 3000 to 3500 and see whether the sound/feel goes or changes in any way. Just another thought in hopefully diagnosing the problem that's all. Regards Steve M

I was worried when my old 60 series started doing this... only through certain speeds. Then I remembered to unlock the hubs. :)

Of course when I say old 60, I mean it was old. And I don't know if the wheel alignment was any good, or the tailshaft balanced, or maybe bearings were on their way out. I just know that unlocking the hubs fixed it.

So... seeing as yours is a completely different car, with constant 4wd... all I'm suggesting in the end is maybe there's something in the front end.

Hi Col, could be tyre noise, try rotating tyres back to front,side to side, and rotate on rim. Have heard of different brands of tyres making all sorts of road noise. Col

Hi Col88,
Had a similar problem in the 80's with a Mazda 929 where around 95/110kph.
had one hell of a drone/vibration. As I was in the tyre suspension game as a last resort I changed tyres to a different brand and was amazed at the difference (no noise at all.
We finally worked out there was harmonics between the exhaust noise and tyre road noise.
If you can try a different brand.
Ian

This may be a stupid question, but can I take the tailshaft out and run it as a front wheel drive to check if it is the tailshaft?

The tyres have been balanced and rotated, they are worn slightly uneven, but I thought if it was tyre noise it would get worse as speed increases, something the tyre guys seemed to believe aswell.

Thanks for all your replies, someone will come up with something I'm sure.

Col
I would think it could be related to transfer case bearings or gearbox output shaft bearing
Bob

Hi Col88

This might sound silly but Pajeros do this, check the bash plate under the transfer box, if it is bent or even full of mud when you accelerate the motor can push onto it and it makes the same noise as you are describing. Hope it is something simple, whatever it is.

Have fun

Craig

COL88
The bash plate is a good tip, but to prove the tyres are not the problem borrow a set of road tyres from a mate and run them for a day, tyre noise can change with throttle because the rubber bushes in the suspension transmit more noise when they are loaded up. Eric.