rattling/grinding noise from drivetrain

[turbolesstom]

Hey everyone, was wondering if I could get a little help.
I have a 89 IX that has been making some bad noises. The noise only occurs when I am accelerating, or cruising at a constant speed and hit a bump. the noise does not occur when the car is cold, only once it has started to warm up. The best way I can describe it is a "clicking-rattling-knocking" noise coming from underneath the ebrake console area, maybe a bit farther back. The noise increases its clicking frequency as the car's speed increases. It does not seem to affect drivability or acceleration but it certainly has me worried. A quick check underneath revealed nothing. any ideas?

thank you

[turbolesstom]

For anyone that is interested. Pulled off the front driveshaft and inspected it. The splines were good on the shaft and the transfer case. I drained the t-case to check for metal shards, fluid came out clean. Once I refilled the t-case the noise went away. It is suspected that my t-case chain is loose and was tapping on the side of the t-case. Filled all the way full with fluid it was silenced. So anyone have a similar problem.. might want to check the t-case chain.

cheers