Checking And Adding Manual Transmission Fluid (If Equipped) - Ford 2008 F-150 Owner's Manual

Maintenance and Specifications
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 and adding manual transmission fluid (if equipped)

1. Clean the filler plug.
2. Remove the filler plug and
inspect the fluid level.
375
2008 F-150
Owners Guide (post-2002-fmt)
USA