Superchips + Tow/Haul WTF!

[DieselViking]

So the "shudder" when shifting into reverse while 'tuned' w/ the Superchips has ceased with several hundred miles of driving...now a NEW issue it seems. Tallahassee is hilly, so I use Tow/Haul to save my brakes. So on two occasions now while in Tow/Haul, and slowing down, once I have reached maybe walking speed, 10 mph or less the tranny seems to downshift into maybe 1st? REALLY VIOLENTLY...it's like a really loud clunk/ca-chunk feeling/sound coming from the tranny and the driveshaft goes "DING!". WTF!!!??? I can't always duplicate it, but it's happened twice now. Otherwise the truck drives and rides completely normal. I am stumped. I am tempted to reprogram to Stock and get rid of the Superchips. I wonder if the SCT will bring me any better luck when I get it? I thought my '06 was/is one of the good ones? Any ideas on what this could be? Slow speed downshift/sudden ker-chunk???

[720Deere]

My 06 did the same thing with the violent downshift at about 12,000 miles on stock tuning. I got the latest reflash from Ford and it eliminated the 2nd gear downshift. If you don't have the latest reflash then that's your problem. I don't believe that the Superchips affects the TCM so that's not your problem.

SCT will reprogram the TCM as well as the PCM and control your shifting a lot better than stock programming. The only time that I have any problems with shifting with the SCT is sometimes for the first few miles after I load a tune, but that's rare.

[DieselViking]

Thanks man. That might be the ticket. It's just got me stumped cause it's intermittent and I can't duplicate it, it just does it on it's own randomly. My truck's build date is 11/05 so it's quite possible that it doesn't have the latest Flash. I think I'll return it to stock and drive it a hundred miles or so and then go to the dealer and complain that it's shifting weird and ask for a reflash. If they do it free then sweet, if they want $100, whatever, long as it helps. I'm also changing my tranny fluid and filter soon. That helps.

[TOPFUELF250]

A reflash just may do the trick. This happened to mine also. It was so violent I was checking my review for pieces of u-joints laying in the road. Had it reflashed and it hasn't happened since.