FORD 2014 E-450 v.3 - Manual (Page 213)

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.
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212 Maintenance
2014 Econoline (eco)
Owners Guide gf, 3rd Printing, September 2013
USA (fus)