Truck is a 2006 f350 6.0 dually it is lifted and on 24.5 semi rims. I had some shift solenoid codes come up and the tow haul light flashing so I changed those solenoids and drove it around with every once in a while it feeling like it would go into neutral at a red light. Well it did that the other day and it started slamming the truck basically to a stop. It would leave 4 rear tire short skidmarks. I would put it in park and in drive and make it to 2nd gear and let off the gas and it would do it again when it should coast. I had it towed home. I have changed all filters the solenoids the internal wiring harness the tft sensor. It was tuned but I don’t know to what when this 1st happened now I got a new ecm and a sct livewire tuner now because I bought the truck without the controller it had been lost by the previous owner. I have changed speed sensors also. When I drive just around the block when I let off the gas it slams the truck I can’t tell if it is the transmission. I had a snap on reader put on at a trans shop and no trans codes are coming up. Just egr and glow plug circuit 1 codes.