Have any of you guys on the board done a rebuild on one of the chevy nv4500's? I'm in the process of putting on in my dually that I tow my stuff with, I've got one in it right now making noise in 4th and 5th, I let a buddy drive it earlier in the week and he said he can hear it in third also. I would like to find a manual on this tranny. I took the cap off the other one that I have and found some slack in the bottom cluster and a snap ring broke in the 5th gear housing. What about parts?