hi any ideas welcome.overdrive will sometimes work after long run but have to do 80mph 2 get it 2 engage then works fine until next time.wat do speed sensors actually do also temp sensor for overdrive where is it thanks andy 2000 grand cherokee 4.0 petrol 42re auto
I tow a 3k lb camper with my 2003 4.0 42re Grand Cherokee. The transmission would not downshift when the overdrive was turned off. But the trans would shift normally when the overdrive off. Turned out to be a combination of a bad torque converter and valve body not allowing the fluid to reverse itself when the overdrive was turned off. It is much better now, but it is far from perfect.