why can't I go into drive? It goes straight to 4th gear

The shifter won’t allow me to select Drive

Yes all the (PRND) lights turn on when truck is started but when trying to shift to drive it goes right to 4th gear

This is going to require a professional scan test so the actual failure can be detected .. Today's *pro quality* scan tools are the MOST proficient way to determine what is going on as the live data screen will let a knowledgeable technician view exactly what the transmission operation readings are - throughout ALL ranges. The gear - range - selection sensors do give some problems on these vehicles - that requires an experienced tech to evaluate and repair... There is no DIY repairs recommended! https://repairpal.com/repair-shops