Just yesterday, (1/30) I replaced my timing chain in my 3.9 Dakota. Man was it really worn out. Never seen one as bad. Truck has 146K on it & I don't think it had ever been changed. Made a huge difference in performance & the rattle is gone! So if anyone out there has the rattle & is wondering about fixing it, go ahead. Not too hard to do (took me 4 hrs.) & sure will save you $ in the long run.