So I've noticed a bit of noise coming that sounds like the chains are slapping some metal when I back up. It is usually only like a "clunk" and then doesn't seem to happen any more. Everything seems to be working properly in both forward and reverse. The chains are new (15 hours on them). The idler chains are properly tensioned. The chain tensioners are in good shape. When I oil them, there appears to be a few shiny spots on the tops of the third set, but no sign of wear anywhere.

It's on an 8x8 avenger... Any thoughts?