One thing I'd like to note about the Hemi... I got a new 2005 Quad Cab Hemi 4x4 back in July, and it seems that once I hit about the 10k mile mark, the engine characteristics changed a little bit. I've noticed that the engine holds a higher gear a lot longer when going uphill in one of the OD gears, and I consider this a good thing because the 5.7L is strong enough to power up a pretty good grade in OD without needing to downshift. As a result my gas mileage has gotten better. The truck also runs generally smoother due to break-in of all the gearing, as expected. I only bring this up because the transmission seemed really eager to downshift all the time when I first bought it.

Anyone else notice the change in engine behavior after a certain amount of time, or am I imagining it? It seems a lot more significant than on the Dakota I used to have (2000 4.7L CLub Cab Dakota Sport 4x4).

 

The computer has a chance to learn your driving habits and dynamics. I really like this because it 'knows' that I want it to shift into OD and stay there. While a lot of the progamming is already done, it does learn your driving style.

I also noticed that after 12K miles and then driving a brand new one, it seems it has more power now that it has some miles on it. Could be wishful thinking, but that is what I felt via butt-dyno. (same specs)

 

So are you saying that if i bought a used truck with 30K miles, it can no longer learn my driving habits? If so, that sucks.

 

I think that it is a constant thing. I notice when I drive it nice and easy, the shifts are softer, upshifts later, etc. When I get on it and keep on it (not very often), the shifts are firmer and it downshifts sooner. It is a kind of adaptive thing.

 

sweet- i dont want to be stuck with an ol grampa truck.

 

If you disconnect the battery for a few minutes, it will reset and learn all over again.

 

[sm=funnypostabove.gif] LOL...

 

Clueless comes to mind......and why do you think the post above yours was funny? When you disconnect the battery for a few minutes, re-connect it, the computer goes through quite a learning curve. Has for about the last 10 years. So why is the former comment funny?

 

I was just wondering the same thing!!! I have a 05 Quad Hemi and when I went over 15k it started running smoother AND shifiting much better. I have also noted that the acceleration seems smoother as well and what i mean by that is I used to take off (standing stop) and spin the tires ALL the time, now when i accerlate hard (not flooring) "the beast" just hooks and goes. [sm=badbadbad.gif]

 

I was told disconnecting the battery on these trucks does not reset the computer. You have to plug it into a scanner.

This came from the guy at AutoZone who usually knows his stuff, but he is also working at AutoZone for a reason so I could be wrong.