This Promaster transmission has no reserve power in 6th gear at highway speed. Even after 22500 miles, with or without a load, it drops to 5th on inclines. It climbs in 5th just fine, but at over 3000 rpms, and less than 10 mpg. This performance is dramatically worse than my 2013 Toyota Sienna v6 and my previous 2012 Toyota Sienna minivan with a 185hp 2.7 liter 4 cylinder engine. While the Promaster is higher profile and about 700 lbs heavier, 3000 rpms in 5th gear just doesn't make sense, and is causing excessive wear on the drivetrain. The Chrysler engineering team should reprogram the transmission for 4th, 5th, 6th gears and the torque converter clutch.