Just bought a 2000 grand cherokee limited with the quad a drive tranny the other day knowing I'll have to do some work to it. Finally got it up and running and it takes or barely wants to shift into overdrive. I'm thinking the input and output shaft sensors, but will take any advice. When it does shift up it pretty much downshifts right away hard. Plus the low coolant light is on and the coolant is full. I appreciate any advice I can get. Thanks