Could be that the US government left a few marijuana bricks behind during some of their drug smuggling operations. Sorry, I just couldn't pass that up, lol!

 

I found mine. You didn't find yours ?

 

Mine does it occasionally too. I really don't think its fuel sloshing or it would do it more than once.
Lifetime Powertrain Warranty for me.

 

2009 does have a flash update for such.

 

My 03 5.9 magnum did it, and my 08 5.7 hemi hd does it. I never noticed it in my 03 4.7 though. I do not think its fuel at all, as mine did it with less than 1/4 tank.

 

I checked it all afternoon and this morning, and my tach does nothing when my 'bump' occurs. Mine happens when I'm stopping, but after I let off the brakes. I don't beleive it does it till I let off the brakes. It feels like a brake is getting hung up or something? It doe'snt do it all the time on my 08. I bet my issue is a caliper hanging up from time to time.

 

Mine was doing it at the tail end of the stop and it definitely was a late downshift feeling into first. Very subtle. Just like another vehicle bumps you from the rear. Hence the term 'bump stop;.

 

My 2011 does the exact same thing. It has 250 km on it. It also surges sometimes when coming to a stop and again when I let off the brake. Not sure what that is. The "bump stop" definitely feels like a late downshift into 1st.

 

Its the gas tank. Got the bulletin from the dealer and tested it out. Full tank no bump, 3/4 tank to 1/2 tank, bump, under 1/2 tank it goes away again. Been through 6 tanks and I can almost time it on the gas gauge now. Its especially more noticable if you have the 32 gallon tank.

 

You might be right, I've only been through 1 tank in my truck and I was just thinking that I hadn't felt that in some time. I guess it could be the tank. Next time I fill up I'll watch for it.