1. A method of managing firing fraction transitions in a vehicle having a powertrain that includes an engine and a drivetrain that includes an adjustable slip drivetrain component, the method comprising:while the engine is operating at a first firing fraction and the adjustable slip drivetrain component is operating at a first drivetrain slip, determining a requested second firing fraction that is different than the first firing fraction, the second firing fraction having an associated second drivetrain slip and an associated second drivetrain slip transition threshold that is higher than the first drivetrain slip;
initiating a transition from the first drivetrain slip towards the second drivetrain slip;
transitioning to a target firing fraction that is different than the first and second firing fractions, the target firing fraction (i) being selected from a set of available firing fractions capable of delivering a requested engine output, and (ii) having an associated target drivetrain slip transition threshold that is less the second drivetrain slip transition threshold; and
after transitioning to the target firing fraction, transitioning to the second firing fraction, and
wherein each firing fraction transition is constrained to only occur when an actual driveline slip is at least as high as the associated drivetrain slip transition threshold.