FORD 2013 E-450 v.1 - Manual (Page 214)

High Fluid Level
Fluid levels above the safe range may result in transmission failure.
An overfill condition of transmission fluid may cause shift and/or
engagement concerns and/or possible damage.
High fluid levels can be caused by an overheating condition.
Adjusting Automatic Transmission Fluid Levels
Note: Use of a non-approved automatic transmission fluid may cause
internal transmission component damage.
Note: An overfill condition of transmission fluid may cause shift and/or
engagement concerns and/or possible damage.
Note: 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.
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214 Maintenance
2013 Econoline (eco)
Owners Guide gf, 1st Printing
USA (fus)