just installed a brand new ford racing fully assembled 8.8 axle assembly.finished the install last night and took the car for a spin after work. Man what a world of difference the 373's make over factory 308's. after letting my foot off the gas a few times i heard some clunking. So pull it in the gargae and raised the back end. with the car in neutral and the e-brake off, I gently rolled the tire on each side individual and there seems to be slight play roughly an inch or so going by the outside diameter of the tire before it catches the splines inside (im assuming). I can audibly hear it. Like an idiot trying to save money I through the old axles from the original 8.8 in the new one. The axles had 65k miles on them. I know they were original but never heard the clunking in the old setup. The old 8.8 was in ok condition but the trac lok was done and the oil in the rear was never changed from what i saw when i opened it up. Should the axles have any play before it catches inside? or is it supposed to be tight as can be?