The other day my kids wanted to “hear the truck whistle” when we got done driving around. So they got out and stood next to the truck while I revved it up. The next day when I went to back out, the truck didn’t budge in R and didn’t even rev up. However it does rev in N, P, D, 1,2,3; but no movement. Has anyone run into this? I have since changed the fluid, filters, direct and epc solenoid, temp sensor and did get one code for the OSS sensor and I’ve changed that too. I have also drained the ECM and reprogrammed the truck to both stock and tuned levels. NOTHING has changed. I’ve found some old threads where others have had this issue, but they never replied with their solution.