I never hooked my kickdown wire back up when I pulled my TH400 out of my -get this ...'72 C20 :wink: -and stuck it in my Olds. It upshifted and downshifted just fine. Maybe the problem is elsewhere?Sounds like the valve that the governor is supposed to slide may be sticking. it definitely sounds like a governor issue,but you said that checked out.Can you see if that valve is free?
My TH400 has a manual valve body in it now. You are welcome to the stock one that came out of it if you end up thinking you need one.It has a low level B&M shift kit in but is in perfect working order. Just let me know if you want it. All I ask for is shipping costs,please.