Hello, and thanks for all the valuable information this forum provides. I've had my disco 2 for about 3 months now and have done a ton of maintenance with help from members posts and RAVE. Haven't had to ask a question until now though (I've found people with similar issues but wanted a little more direction)

Have a knocking noise associated with road speed not rpm. If I am at idle or in park and rev the engine the noise is not present. I Only hear it when I'm driving and it seems only seems to occur (or loudest maybe) when I decelerate by taking foot off gas. It's not noticeable during acceleration. I've replace transmission fluid/filter, transfer case fluid, and both diff fluids about 2 months ago and haven't had any issues until now. If I would take a guess seems to be associated with front axel/ujoint/transfer case ? Not sure but wanted some more input.

I've uploaded a mp3 file of the noise. As I was driving I held my phone out the driver's side window as close to the road as possible.

thanks in advance !

 

picture of front drive shaft and u joint.. assuming that is the cause or contributing factor

 

pulling front drive shaft today.. suspect it's that..

 

ordered new front drive shaft from lucky8... original one with 124k miles and 12yrs old. Very dry looking.. has to be the cause.. probably posted this in wrong forum but I believe it will be resolved after new one comes in..

lubed rear shaft as well...

 

Since you have a 2004, you should be able to confirm that the front shaft was the cause of the sound by locking the transfer case and then driving, now that the front shaft has been removed.
Standard advice is not to go too fast with the t-case locked, but you should be able to get up enough speed to be able to check for the noise on deceleration.

 

thanks... good idea... new drive shaft is on the way (needed to be replaced regardless).. it was stock and the zerc fitting hadn't even been put on slip joint.

 

new lucky8 drive shaft fixed it...

 

Good thing you caught that. This is what usually happens when you don't. Land Rover designed it that if you fail to keep an eye on your front driveshaft...it knocks a nice inspection hole in the trans so you can check the condition of that, too...lol.



Glad you dodge a bullet by changing yours.

Brian.

 

wow.. yes I heard stories... somehow I missed this "critical" flaw when I first purchased or I would have immediately replaced.. I was very lucky.... greased rear one real good as well... Another good by-product is there is a lot less "rattles" underneath when I hit bumps, etc.