2010 Ford F150 Regular Cab Owner Guide 3rd Printing - Page 395

Maintenance and Specifications An overfill condition of transmission fluid may cause shift and/or engagement concerns and/or possible damage. Do not use supplemental transmission fluid additives, treatments or cleaning agents. The use of these materials may affect transmission operation and result in damage to internal transmission components. Checking 6-speed automatic transmission fluid The automatic transmission does not have a transmission fluid dipstick. Refer to your scheduled maintenance information for scheduled intervals for fluid checks and changes. Your transmission does not consume fluid. However, the fluid level should be checked if the transmission is not working properly, (i.e., if the transmission slips or shifts slowly) or if you notice some sign of fluid leakage. Transmission fluid should be checked by an authorized dealer. If required, fluid should be added by an authorized dealer. Do not use supplemental transmission fluid additives, treatments or cleaning agents. The use of these materials may affect transmission operation and result in damage to internal transmission components. TRANSFER CASE FLUID (IF EQUIPPED) 1. Clean the filler plug. 2. Remove the filler plug and inspect the fluid level. FI A DR IN LL 395