Chain suck w/ new parts?

[drew]

So I swapped out my xd600 (46/36/26) for an xd2 (46/36/24). Other than slightly shorter crank arms and a 24t steel granny ring, these are pretty much the same cranks. Now when I flip to granny when applying force, I get chain suck. Never happened before. New crank and rings. Chain isn't old.
Any thoughts?

[Joe Bernard]

The chain may not be old, but new chainrings/cogs like new chains. I 'spect this will solve your problem.