When my truck warms up and it will no longer shift in the second gear and the temperature on the oil pressure completely drops down

Hello, it could be that the processor is preventing shifting into gear due to it thinking the oil pressure is low. Perhaps address both concerns simultaneously. Determine if the oil pressure concern is a sending unit or wiring issue, or an actual oil pressure issue that is happening. Then, you will want to test the transmission systems to see if there are any trouble codes and what may be influencing them. Start with the oil pressure concern - perhaps you'll find the concerns are related. But, many other variables are possible and we can't possibly know the history and condition of then vehicle. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.