Help Needed 2008 SD trannie problem

[turbo32valve5.4]

I have a 08 f250 6.4L with a diablo programmer, when I am slowing down right around 20 mph my truck downshifts manually in to second gear and it is really getting annoying. Has any one ever had a problem like this?

 

[sagebel]

Are you saying that the shift lever is moving on it's own?

 

[atk]

does it shift down with your programmer unhooked?

 

[powerstrokeguy]

Good answer!

 

[Zookie400]

i may be wrong but arent diablo programmers user programmable? i bet you could change that somehow, or have a diablo dealer write you a file to upload onto the programmer and then into your truck. it may be worth calling diablo and asking them.