I have a 98 Dodge Ram 1500 5.2 (318) that keeps getting P0720 code (check engine light). The symptom first was truck felt like it was taking off in 2nd or 3 rd gear, If you manually down shifted to 1st it would take off, then you shift to drive and it would shift ok. I have spent $900 on supposly getting fixed. They have replaced all sensors on inside transmission, speed sensor on outside transmission. Transmission shop tried several thing, with no luck. They finally replaced the rear oxygen sensor after the catalyst converter. It fixed it for 3 weeks. I now encountered problem again when I came to a full stop, tried taking off, but it felt like it was in 3rd or overdrive. It finally got going and seems to be ok, except it takes a little longer to shift from 1st to 2nd gear. Check engine light on. I found out there are 2 oxygen sensors, maybe other one needs to be replaced. Supposly the oxygen sensor was grounding out and it was on same circuit as speed sensor. I also read there is a speed sensor at differential. Has anyone experienced something like this???