For quite some time now my truck has had this sound that sounds like marbles bouncing around the bell housing or inside the tranny, This is in my 01 2500 with the nv4500 its a 5.9 magnum, I read on the plenum thread that there seems to be a similar sound under heavy throttle, but I get this sound all the time, idling, light throttle, heavy throttle. The only time it doesn't make the sound is when the clutch is in. Which lead me to believe the throw out bearing is shot because the clutch has been engaging and disengaging hard, real jerky sometimes, and its hard to find where it grabs. At this point I'm just checking what I think it is so I'm not spending money where it doesn't need to be spent

 

If you apply light pressure to the clutch pedal, does the sound go away?

 

Yes immediately, it stops the second I push it in

 

Throw-out bearing. Might just as well do the whole clutch job while you are in there.

 

Thanks! That's what I originally thought just wanted to check, I had plans of replacing the clutch and bearing all at once.. just 1 more question...Now that I have the locker in the truck when I make a sharp turn like turning into a parking spot, drive through or turning onto a side street it jerks the whole truck real bad and the only way to avoid it is to stay in the throttle the entire time through the turn, is it the throw out bearing causing that? or is that the locker?

 

That's the locker. What did you put in there?

 

Thought so... That spartan locker i found on ebay for the dana 60. Could the throw out bearing have something to do with it? It doesn't do it all the time just seems to be if i dont get in the throttle the right way it just wants to buck real hard

 

I have the same problem, except mine is when the throttle is given, when I let off, it goes away. Haven't figured it out yet but I have an automatic tranny.

 

Do you have a locker in the rear axle? Mine also is jerky when im in the throttle just not as much, it seems like the locker locks mid turn and it starts jerking and cant get it self to unlock, man its a horrible sound..gets everyones attention

 

Clutch, etc. will have zero effect on the rear end, and how it behaves. The locker *Should* unlock when going around corners, when not applying power.