Ford F-150 Heritage transmission slipping after warming up, unable to engage overdrive on Ford F-150 Heritage

Some Ford F-150 Heritage owners report experiencing transmission slipping after warming up, particularly with difficulties engaging overdrive. Common causes include low transmission fluid levels, which can lead to slipping if not regularly checked and maintained. Additionally, issues with the overdrive clutch steel separator plate(s) may contribute to this problem, and replacing the OD friction plates and accumulator assembly can be a potential solution. Owners have also noted that sensor problems, such as issues with the lead frame and Turbine Shaft Speed sensor, can result in erratic shifting behavior, necessitating checks and possible replacements. In cases where slipping persists despite these measures, a transmission rebuild may be required. It is strongly advised to cease driving the vehicle upon noticing these issues to avoid further damage and costly repairs.