I have a 96 F350 CC LB 4X4 with a E4OD This truck has had this problem for a bout three years now. That is one of the resons i sold it. I got it back from my brother and need to fix. The Back up only works when it wants to. If it's cold it works all the time (like first time that day you move it or after three or four hours) after that the temp out side playes with if the colder it is workes beter the warmer it is the less likely to work. But at any time it's a question. I had at trany rebilt 30,000 miles ago forwerd works great every trany shop says they haft to rebild at $1500-2000 no mater what don't want to rebild just need to get fixed so i can use as DD and get out of the car i'm driving.