Outer Limits 4x4 Board

Brian, I'm not an 80 series driver, but I am betting it is in the lift and resulting uni joint angles, like Andrew said. It sounds like when you remove the rear driveshaft out of the drivetrain the noise disappeared.

I'd take an angle finder and measure the transfer output flange and compare it with the pinion flange. They have to be parallel or within 2 degrees of each other.

Can you correct the pinion angle after the lift in the 80? Using something like caster bushes? Another thing you may try is to drop the transfer case lower by changing the mount.

Dave

Simo63 wrote:Hi Dumbdunce... I believe from your previous posts that you are quite mechanically capable

This I would agree with, however I can’t look past the thought that you may need your hearing checked or a cheaper option would be getting another person in there with you and see if they can notice it (someone who hasn’t read this thread). Are you the only person who hears this sound?

beanz2 wrote:Brian, I'm not an 80 series driver, but I am betting it is in the lift and resulting uni joint angles, like Andrew said. It sounds like when you remove the rear driveshaft out of the drivetrain the noise disappeared.

I'd take an angle finder and measure the transfer output flange and compare it with the pinion flange. They have to be parallel or within 2 degrees of each other.

Can you correct the pinion angle after the lift in the 80? Using something like caster bushes? Another thing you may try is to drop the transfer case lower by changing the mount.

Dave

pinion angles aren't spectacular but aren't too bad either. I have driven plenty of lifted 80's with standard trailing arms, without this noise. I have been through the exercise of dropping the vehicle back to standard height to test this theory. the noise was still there when driving on the rear, and gone when driving on the front.

Last night I swapped tailshafts with DX80 for a test drive but it has made no difference.

therefore, in summary:

it is not the diff - diff has been rebuilt three times using different sets of gears and new bearings, with perfect backlash and a perfect tooth contact pattern,

it is not the gearbox - when driven on front axle, the noise goes away.

it is not the transfer - transfer has been swapped out with a known good unit

it is not the tailshaft uni joints - tailshaft uni joints were replaced with new

it is not driveline angle related - vehicle has been returned to standard height and the noise does not change.

it is not the tailshaft slip spline - tailshaft has been swapped with a known good unit.

it is not tyre noise, it is only there with power applied, it is not there on coast.

rear wheel bearings are near new.

I am out of ideas and if not resloved soon, will sell the vehicle, it makes me cranky every time I drive it. I would like to get a double cardan front shaft fitted so I can do a more extensive front wheel drive test, anyone got one handy?

MQ080 wrote:

Simo63 wrote:Hi Dumbdunce... I believe from your previous posts that you are quite mechanically capable

This I would agree with, however I can’t look past the thought that you may need your hearing checked or a cheaper option would be getting another person in there with you and see if they can notice it (someone who hasn’t read this thread). Are you the only person who hears this sound?

yes other people can hear it at some speeds it's difficult to have a conversation in the car because of the noise.

I had my hearing checked about 6 months ago and it is well above average for my age, perhaps that is the problem - if I went to a some more loud concerts perhaps I wouldn't hear the noise any more?

PS get your bike out of my garage!

do you have a locker in the rear? I have just installed an air locker in the front ant now have the same noise, (diff whine). I have pulled it down twice and alos had two other mechanics check the back lash incase i set it up wrong. all three of us agreed that the backlash was perfect. one thing i didn't check was crwon wheel run out that is my next step. everything else has been rebuilt in the front and no noise was present until i fitted the locker. I'm starting to think that the locker is the problem. I'm 100% certain the noise is in the diff, on mine.

also have you checked for bent axles? sometimes these will cause a diff to whine. do you know someone with another diff, not center? swap it and see for certain if it is the diff or not?

hope this helps you i know your frustration, it shits me to tears to drive my 80.

hmmmmm......what oil are you running in the rear diff?

As already suggested, it may be the wrong type, perhaps a little thin.

can't remember which oil I put in but it is a quality 80W90 EP/Hypoid GL4 or 5 so should be all right.


could be the locker. next test will be with an open 60 series diff in there. shrug. over it.

I have spare bits if you need some....

Is the locker a 4 unbrako type, or the later 8?? Its not unheard of to get runout with the earlier type...or even a little bit of something under the ring....a bind in the centre flange that supports the ring....
Andrew

dow50r wrote:Is the locker a 4 unbrako type, or the later 8?? Its not unheard of to get runout with the earlier type...or even a little bit of something under the ring....a bind in the centre flange that supports the ring....
Andrew

please explain the difference between the early and later lockers? what differentiates the 2?

dow50r wrote:Is the locker a 4 unbrako type, or the later 8?? Its not unheard of to get runout with the earlier type...or even a little bit of something under the ring....a bind in the centre flange that supports the ring....
Andrew

it's only a couple of years old, it's not a crusty old 4 bolt. I think the runout was ok, don't remember if I checked it or not. will check it when I have it out AGAIN

carts wrote:

dow50r wrote:Is the locker a 4 unbrako type, or the later 8?? Its not unheard of to get runout with the earlier type...or even a little bit of something under the ring....a bind in the centre flange that supports the ring....
Andrew

please explain the difference between the early and later lockers? what differentiates the 2?

there isn't much similarity between the early and late type, except the operating principle. the early type have 4 cap screws holding the air side of the hemisphere together, and those bolts are famous for coming loose after a while. it is the easiest external telltale. later models have 6 or more bolts with little retaining clips so they theoretically can't come undone.

What was the end result of the noise?
Has there been an end result?

Cheers,
Paul

Yes. It turns out the whine was all in DD's head, and he has since been committed to the loony bin. That's why he's not around here any more

never really figured it out. vehicle now has 300,000km and plenty of noises, and noisier tyres. so it's hard to tell if the same noise is there or not. it has a different rear diff in it now, the last one the teeth on the pinion all fatigued and a couple fell off. otherwise still gong strong. holy freaking gravedig.

Are any of the hubs locked and have you checked that 4wd has disengaged properly ie front shaft spinning. When I put a set of locking hubs on mine before i got the part time kit for transfer case mine made same noise as this.

Ive just been had Anyways im sticking with hubs.

Rear shaft vibs should disappear after you have put a spacer (around 10mm) between the gearbox crossmember and chassis.

I have the whine. And its worse now. Its right upto the point when you stop and the speed of the whine is the speed of the car. It is already part time. I have just had a new gearbox and transfer rebuild, complete front end rebuild (cvs and axles, diff centre and bearings, complete rear diff rebuild (diff centre and bearings) and its still there!!! Only thing left is drive shaft and motor. Then its new.

It's probably just normal gear noise all cars have to some degree. Difference with the 80 though is they don't have much if any sound deadening in the rear.

oldmate wrote:It's probably just normal gear noise all cars have to some degree. Difference with the 80 though is they don't have much if any sound deadening in the rear.

Maybe, but mine is definately not gear noise. It sounds like bearing noise. So much so when I drive on the highway and there is a concrete wall next to the truck. I have to wind the window up.

ive got the exact same problem with mine it onli came around when i fittd a 3inch dobbinsons kit ive taken the front shaft out and it went away ive had my front shaft extended new uni's new spline so its a brand new tail shat preety well and its still there but not as bad as it use to be. could be a bearing in your gearbox drop all ya drive line oils and see if you have any metal shavings or chuncks im still trying to work mine out hopefully one day it will be sorted

dave89 wrote:ive got the exact same problem with mine it onli came around when i fittd a 3inch dobbinsons kit ive taken the front shaft out and it went away ive had my front shaft extended new uni's new spline so its a brand new tail shat preety well and its still there but not as bad as it use to be. could be a bearing in your gearbox drop all ya drive line oils and see if you have any metal shavings or chuncks im still trying to work mine out hopefully one day it will be sorted

Mate yours is a different issue. Your is simply due to the changed angle of your front shaft which everyone who fits bigger that a 2 inch lift will experience. Options are double cardon shaft which has its own issues, part-time kit or there was a thread a while back about using the split shaft out of the rear of a hilux. You may also not have been give castor bushes with your kit which you do need.

For the Hilux shaft thread i was talking about search in toyota 'Handyvtip for 80 series owner' and you will need to have the v as it was a spelling mistake in the original title.

Mine has a whine that is audible when keeping the car at speed but goes away when accelerating or backed off. Been told is as a result of.using vmx80 in the transfer and the lay shaft is whining. Apparently although its better for shift its not so good for transfer unless using an additive. Been told to replace the oil with Mobil agrifluid 424 as this is basically the same but with the additive already in it. Will be dropping oil and replacing in august can post up if it made a difference if people are interested.

This is the oil they use in tractors and other heavy machinery.