will only upshot if od button off

[kellyf]

2009 e 350 with 4r75e will slip after second shift to no avail but as soon as od off button pushed fall right back into gear.any thougjts

[lmorris]

Second shift would put you in 3rd gear and the OD button should have no affect on this gear. Is it possibly starting out in second and the second shift is putting you into OD?  Unless when it attempts the 2-3 shift the direct clutch is pooched and won't go into 3 or OD. When you turn off OD it might be kicking back into 2nd. Just my thoughts when looking at the band chart, which doesn't seem to read right if I try to copy/paste it into the post. You could try going to www.toolcrib.ca and in the downloads section is a nice powerflow PDF. The 4r70w has the same shift applications as the 4r75e. It might help.