Rear end noise on acceleration=...improper gear mesh. Yes, take the center section out and take it to a qualified rearend person who knows Mopar rear ends. If it is a 742 or 741 case, it will be a shimmable pinion gear. If it is a 489 case, it will have a crush sleeve. If it is a 489, I would suggest that you get the new hard spacer to install in place of the crush sleeve, thereby making the pinion depth shimmable on the 489 also. Not a difficult procedure and should only cost about $50.00 to have properly setup, unless of course you need some replacement parts in there also. Good luck with the project, Geof
