Tow haul aggression issue
 

I have an 08 super duty. 6.4L diesel. Automatic transmission. All of a sudden the downshifts in towhaul are super aggressive. To the point where we cant hardly use it. Any ideas??

Disconnect either the PCM or both battery negative cables. This will clear the Keep Alive Memory and the software will have to learn again. Once in a while it learns something wrong and then can't learn it's way out of it.