grinding noise on over run

[burgerman]

, Hi all, i have a 1991 V8 disco ( manual) and i have recently replaced all u/joints in both props, a rear diff ( not for the above reason) but for a while now i have had a grating/loose sound coming from gearbox area ( it seems) It only happens when i come off the gas pedal and reamins till i accelerate again, i must admit it has got to a noise level that something is not right :(   i have had a look/pull n push around under neath but not found a culprit as yet , i kinda have a feeling its a gearbox issue ? for the record the gears operate fine, and the noise is not any louder in any of the gears  

 Any clues ??

[Range Rover Blues]

OIl level?  water contamination?

If it's the gearbox it could just be noisy.

[Guardian.]

mine did that, everything worked fine but made hell of a noise on overrun, it was the transfer box, put a spare one on and it dissapeared.
must have been a shot bearing in there somewhere.

[Ja1983]

thrust bearing?

mines paggered, but luckily the clutch has started to die too.. so dont have to put up with it much longer!  :lol:

[andyb]

It could be either thrust bearing or the transfer box.

I think I would drain the transfer box oil and see if anything comes out with the oil, while the oil is out remove the transfer box bottom cover and have a good look. This will be a lot easier than pulling the whole box and checking the thrust bearing.

HTH

[extreme90]

is the replacement diff a good un ?
just check the pinion for play

drain the oil off the transfer box aswel and see what comes out
dan

[burgerman]

Now fixed, It was a kanckered front u/j  :oops:    I was a tad suprised though as they had done 200 miles tops :(   Oh well at least its sorted for a lot less work and money than a gearbox

 Thanks for the tips

[Disco-Ron]

I doubt last sunday helped much eh!!!...;)

[Ja1983]

...another uj lasting less than a tankfull?!!

did you fit cheap and cheerful or hardy spicer or genuine??

[burgerman]

Came in a hardy spicer box  :?

   Think i shall have to grease them a tad more  :roll:

[Range Rover Blues]

Was it a good fit in the propshaft?

I'd think 200 miles really bad though, even if you put no grease in at all.

[extreme90]

i can wreck u'js in one weekend  :lol:  :lol:

they wernt cheap crud just been re-boxed were they ?
did it have gkn in the middle of the spider ?
200 miles is pretty damn low  :shock:

[Ralph]

Havent got catalytic convertors on has it, they sometimes make a very loud rattling,grating noise on overrun when everything else is nice and loose making small vibrations.