I'm looking to convert my Cannondale T1 from a 10 speed 13-32 Ultegra setup to a 9 speed 12-36 setup. I can get a good deal on a Shimano XT 10 Speed Shadow rear derailleur. I use friction bar end shifters so indexing isn't an issue and I'm already using a 9 speed trekking crank up front.

Will there be any issues with using a 9 speed chain with the 10 speed derailleur? I'm presently using a 10 speed chain with the present drivetrain with no issues. Al