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Discussion Starter · #1 ·
Hey all! New to the site so if this has already been asked I apologize. I just bought a new 2018 ram 3500 cab chassis and had a service bed installed on it. My concern is with the transmission in this thing. There seems to be a pretty good lul between 1st and 2nd gear...enough that you almost feel like the brakes were tapped. Also, it seems the transmission shifts pretty erratically during acceleration...almost like it can’t decide what gear to go to. I had a friend tell me this is normal....but I can’t hardly believe that. Any opinions on the subject? Thanks in advance!
 

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Discussion Starter · #3 ·
Sorry, I have the 6.7 Cummins and the window sticker lists the tranny as AISIN heavy duty 6 speed auto transmission. If there is more details you would need on tranny let me know where to look and I will be glad to get you additional info. Thanks!
 

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How long have you had it and how many miles on it so far? I ask because these computers learn as we go and the more you drive it the better it gets at adjusting to your driving style. Some have said that after letting their teenager drive their truck for a week it drives like a different truck. Perhaps after the first 1k-2k miles it will settle in. Just a thought though.
 

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Discussion Starter · #5 ·
I have had it for about 2 weeks. Had 8 miles when I purchased it, but apparently they drove it to the outfitter to have the bed installed. When I picked it up it had just under 300 miles on it. Right now I am just under 1100 miles. The first week I drove it I drove as I normally do...once the fuel mileage got down to the single digits I started driving like I had an egg under the accelerator lol
 

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'18 RAM 3500 4WD Tradesman 6.4
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I don't have the diesel engine so I'm a bit uncomfortable chiming in here, but from what I've seen reported from those who do run the diesel, single digit fuel mileage for a Cummins equipped truck sounds a bit unusual, unless you're towing monster loads regularly or driving like you stole the truck.

Or even if you are. Heck I don't get down to single digit fuel consumption driving with close to maximum payload with my 3500 with the 6.4 hemi, and I'd expect a lot better fuel economy from a Cummins.


It is true that these modern transmissions "learn" from the way they are driven, however, so as has already been said, it's possible that things will smooth out over time.
But still, that fuel consumption you're reporting puzzles me.
 

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Discussion Starter · #7 ·
If I am out of stop and go traffic, I can get it up into the 15’s, but around town where I am at most of the days I have to really baby it to keep fuel mileage out of the single digits. I know the service bed is pretty heavy, plus all the tools and parts I keep in it don’t help. I had a 2012 model identical to this truck and it was the same way with the fuel economy, so I wasn’t totally shocked in that department. The erratic shifting is pretty annoying tho.
 

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At 1100 miles it should be just starting to settle into a program I would think, but it would be hard to say as I'm not driving it. I don't have any experiences in the chassis cab trucks and the AISIN trans. If it were me and I were this troubled by it, I would take it in and have the dealer check it over and see if there are any needed PCM updates or if it feels unusual to their trans tech.
 

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Hey all! New to the site so if this has already been asked I apologize. I just bought a new 2018 ram 3500 cab chassis and had a service bed installed on it. My concern is with the transmission in this thing. There seems to be a pretty good lul between 1st and 2nd gear...enough that you almost feel like the brakes were tapped. Also, it seems the transmission shifts pretty erratically during acceleration...almost like it can’t decide what gear to go to. I had a friend tell me this is normal....but I can’t hardly believe that. Any opinions on the subject? Thanks in advance!
Hello willyk73,

I understand why this would be concerning. If you end up going into the dealer, please let us know. We're available via direct message and would be happy to help.

Jasmine
Ram Social Care Specialist
 
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