FORD 2011 E-450 v.3 - Manual (Page 293)

If an overfill occurs, excess fluid should be removed by an authorized
dealer.
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.
H
C
ADD COLD HOT DO NOT ADD
Maintenance and Specifications
293
2011 Econoline (eco)
Owners Guide, 3rd Printing
USA (fus)