Originally Posted by
mechBgon
Dannihilator, to the best of my knowledge, all Shimano's 10-speed mountain stuff including the 770-10 are DynaSys and are cross-compatible insofar as rear indexing goes, which is something to be thankful for... weird exceptions to the compatibility rules are always a bad thing

QBP and the area shimano technical rep says otherwise.
The rear can be made to work, the front won't.