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Discussion Starter #1
When coming off of the highway and slowing down but not to a complete stop then accelerating again the truck will have a shuddering/bucking condition. Feels like when you don't downshift a manual transmission vehicle and try to accelerate. It did it once when about 3 weeks old and a few other times since. Had the solenoid recall done and thought that would've taken care of it but now it seems worse. Took a tech for a ride and of course it wouldn't do it. The reset the adaptives and it seemed better for about a week then I felt it again today. It's either not downshifting from 3rd to 2nd fast enough or the lock up converter isn't unlocking when it should. Doesn't matter hot or cold. I will have the shift indicator display active so I can see what gear it seems to be hanging up on.
 

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Its not MDS before it kicks off is it?
 

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Discussion Starter #6
Don't believe it's the mds, eco light isn't on. I meant to check the fluid when I got home but forgot since I was in a rush. Truck is still home, I'll remember tomorrow. Thanks for the replay.
 

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Don't believe it's the mds, eco light isn't on. I meant to check the fluid when I got home but forgot since I was in a rush. Truck is still home, I'll remember tomorrow. Thanks for the replay.
The eco light is not tied to MDS. MDS can be active with the eco light off and the eco light can be on when it is running on all 8 cylinders. Eco just means you're driving in an efficient manner. Listening o the exhaust is a better way to tell if MDS is on; I have read on other forums where guys have rigged an LED to come on when MDS is active so you can know for sure
 

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hi, I feel you on this, mine has done this and more (stuck in either second or third ) it also seemed to be made alot worse after the recall. According to the ram cares specialist everything checks ok so it is operating as designed. I have heard different opinions about the trans issues and the majority seem to be from the fact that ram used parts of the diesel trans and the old 5 speed combined and brought the funcky shifts from the way the diesel trans shifted .
 

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Discussion Starter #10
I haven't looked into any of the programmers yet but I wonder if they can adjust the shift points to take care of this? I was a tech for 15 years, 10 on volvo, 3 on chevy and two at indy's. Don't have any connections at dodge.
 

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The eco light is not tied to MDS. MDS can be active with the eco light off and the eco light can be on when it is running on all 8 cylinders. Eco just means you're driving in an efficient manner. Listening o the exhaust is a better way to tell if MDS is on; I have read on other forums where guys have rigged an LED to come on when MDS is active so you can know for sure
On the 6.4 Heavy Duty trucks, the eco light coincides with MDS, unlike the 1500's.

My tranny does this same crap. I let my foot off a little and it comes out of it.
 

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Discussion Starter #13
Tranny fluid is full. I personally think it's something to do with the lock up converter control.
 

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Discussion Starter #14
I posted this elsewhere also. Was able to get the condition to happen at will so I drove it with the service mgr about a month ago. He felt it and we made an appointment. When they drove it with the scan tool hooked up and used the freeze frames each time it shuddered #7 cal had a misfire. They ended up finding scuffing in that cylinder. A new long block was installed and I will be picking it up tomorrow. We’ll see if that issue is gone. I know the occasional puff as of blue smoke and the light knock first thing in the AM will be gone.
 

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Discussion Starter #15
With the new long block installed the tranny still does the same thing, was better for the first 200 miles which I’m sure was because they reset the adaptives when they changed the engine. Now they have another customer with the same bucking complaint and the engineers say it’s normal. The factory can’t figure it out so they play dumb, this has turned into a complete disappointment. Also to new engine sounds like marbles when started now after sitting, only 600 miles on it. This truck will get traded away once resolved, nothing like wasting my time and money.
 
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