If it doesn't shift into OD how do you know it shifts out OK?
Seriously, on mine you have to push the OD button to shift into OD when you get above the "od downshift speed" When I slow to 50mph the OD downshifts into third lockup, when I regain speed I push the button and it shifts to 4th lockup. When I press the accelerator more than halfway the TC will unlock in 3rd or 4th gear. The TC stays locked up anytime you are above 30mph and not depressing the throttle more than halfway. This takes some getting used to and some playing with the throttle to get smooth shifts but is very nice feature when towing.
Hope this helps.
Tom