Clunk (I tried to be specific)

[J.C]

My manual 96 developed a clunk sound (Lets start at the beginning). I had the leak between the transfer-gearbox fixed after this job was done the clunk started. Every time I pull away it makes a clunk sound. It’s not the standard LR sound transmission sound. To narrow it down: The shock bushes are new, the front sway-bar bushes are also new, I had almost all of the bushes replaced at the front end of the truck, the U joints all seems to be in good shape. The clunk sounds as if it is coming from the gearbox area, and to me it sounds like a worn bush.
Does anyone have an idea???

[Badger1]

Maybe the trans. mounts or even the motor mounts are worn or loose.

[300bhp/ton]

could be almost anthing including something loose inside the vehicle.

Check the UJ's on the propshaft.

More info on when it does and when it DOESN'T make the sound. Is it only pulling away (forward and/or reverse???). Does it happen at speed under accelaration or decelaration, cornering and so on.

[J.C]

It happens on acceleration when taking off from standing, but sometimes if I accelerate hard in second I can still hear it.
It makes the clunk sound when the car is already in gear and I accelerate, the clunk is also loud and once-off (It only makes the sound once, to replicate the sound I have to step off the gas and then hit it again)
And no it isn’t the lovely normal LR backlash

only under acceleration not deceleration, not in cornering

[Disco Mike]

J.C.
How about a dry slip joint on one of your drive shafts, might want to try a little grease on them.
Mike

[jhmover]

Check the rear ball joint on top of the diff.

[300bhp/ton]

Originally Posted by J.C

It happens on acceleration when taking off from standing, but sometimes if I accelerate hard in second I can still hear it.
It makes the clunk sound when the car is already in gear and I accelerate, the clunk is also loud and once-off (It only makes the sound once, to replicate the sound I have to step off the gas and then hit it again)
And no it isn’t the lovely normal LR backlash

only under acceleration not deceleration, not in cornering

It could still a 101 different things but it does sound like a worn UJ.

The UJ on the propshaft wears, as you pull away it takes up the slack (the clonk) then you won't hear it again until the UJ has relaxed and you take up the slack again. At higher speeds you generally won't always hear it as there's so much else going on. I replaced the prop on mine not long back, it had the same symptoms and the UJ was shot and a real bugger to get off.

[Disco Mike]

U-joints are not designed to take up the sliack of a drive shaft, ther are ridged but again, look at your slip shaft, it is designed to allow the shaft to stretch or shrink as needed and if not greased, will klunk.
Mike

[J.C]

Thanks for all the ideas I will have the suggested areas look at on Monday, if it's not one of the above mentioned I will return to the forum and see if the problem can be narrowed down further.

[p76rangie]

Every part of the drive line has a little slop. Add them all together and you get knocks and bangs, particularly in a manual. You have movement in the input shaft to the gearbox and the clutch plate, then you have movement within the gears within the transmission, then between the output shaft of the gearbox and the transfer case, slop within the gears within the transfer case, then slop in the centre diff, the drive shaft splines to the front and rear diff, then between the crown wheel and pinion, then in the spider gears, the the splines on the axles, the CVs and the then the splines to the axle to the wheels. But as they just had the transfer case out, I would suggest that it is in the output shaft from the transmission and the transfer case.

But as others have suggested, it could also be in the A frame ball joint, The upper A frame bushes. You said that you had replaced the trailing arm bushes, but did to replace the bolts as well. The bolts wear and allow the bush to move backward and forwards.

So in regard to clunks in a Landrover, you can pick any of the above. Good Luck.

[J.C]

As mentioned in the first thread I there was work done on the gearbox, since then the chunk and a wine started. I never thought the two was linked because I was told that the wine was coming from old and new gearbox parts wearing together and the clunk sounded like a bush or mounting.

I am glad to say that the wine and the clunk is gone now , the sounds disappeared with one big clunk and a cloud of smoke . I then got the idea that the two sounds were liked and that something big has hit the fan.

Ok, now here is what happened. The workshop (hold themselves out as Land Rover a workshop) has done everything that should not be done to a gearbox. Here is the list of How Not To:
1. The engineering work that was supposed to be done wasn’t
2. The seals was not correctly replaced
3. The box had the wrong grade oil in
4. The leaking between the t-case and the gearbox was fixed by… wait for it…, they glued the two together with some grey silicone
5. The pretension was never set

Results of there action taken
1. The seal they made, let all the oil out (t-case got fried)
2. The bearing at the bottom side of the t-case broke (not pitted but broke)
3. The t-case main shaft, was stripped of all its thread
4. The speedo-gears are all stripped
5. The central difflock also got fried

But luckily the clunk and the wine are gone now

[Capt. Ron]

Like you said, the clunk and whine are gone But please tell me they are going to right the wrongs they've created.

[jhmover]

Did you go to Three Stooges auto repair? Nyuk Nyuk!!

[J.C]

At this moment I don’t know if they are going to right there wrongs. I contacted them about paying for the damage they caused but got no response from them.
This may sound petty but there are a lot of 4x4 forums in South-Africa so I will make sure that the Un-fixers quality (lack of) of work is known.

Got some quotations of costs involved to get the truck up and running ……dam