Anyone buy a 2025 Cummins yet?

[securityguy]

Curious to hear thoughts as to how it compares to the 2024. Thanks!

 

[Morpar]

So...I just traded a '24 CCLB SRW HO for a '25 CCLB DRW. Both are Laramies, similarly equipped. Both trucks have air suspension.
I only had the '24 for about 5 months. We bought a fifth wheel that exceeded the GVWR of the SRW.

The '25 is quieter and much smoother. The transmission is much better at gear selection for a given speed/throttle condition. It downshifts to keep the engine in the power band.
Surprisingly, the DRW rides smoother.
I do not observe an increase in engine power. I don't know if the new truck (<1000 miles) is somehow limited for break-in by the ECM, but it seems less powerful. The '24 was a beast. Even though the Aisin transmission was confused most of the time, the truck was a torque beast. You could really feel the push in your back when you gave it the beans. I don't get the same sensation from the '25.
I need to wait a few thousand miles on the '25 to see if it loosens up.

I will re-visit this as miles accumulate.

 

[gurdbonk]

I did at the end of May from Mark Dodge. I'm at 6800 miles now, chasing the National Hare and Hound and the West hare scrambles series even though I'm an old retired geezer of 65yo. Super pleased with mine, 99% of my miles have been hauling my slide in truck camper with a dirt bike strapped to the front or rear receiver hitch. Averaging mid-13 mile per gallon since purchasing. Running 65 to 85 mph out west going to races. I finally unloaded the camper and did a solo run a couple days ago out to meteor crater and back averaging 82 mph on I-40, probably 70 mile round trip. Had just rotated tires and had built up some soot with around town driving after my last trip DPF was at 1/3ish when I started my little round trip. Averaged 18-20miles per gallon going out then only 15 to 16 coming back. Apparently it went into active region because by the time I was home after my return trip my DPF % was back to zero. I was bummed that the spare tire that I rotated in did not include a TPMS sensor or it is not functional. My calculated diesel exhaust fluid consumption over the 6800 Mi thus far is 540 miles per gallon. I did an oil analysis after the first 1500 mile break in and I just drained the oil after my last adventure, should have results from the second oil analysis next week. Will post both sets of results here.

 

[AH64ID]

So...I just traded a '24 CCLB SRW HO for a '25 CCLB DRW. Both are Laramies, similarly equipped. Both trucks have air suspension.
I only had the '24 for about 5 months. We bought a fifth wheel that exceeded the GVWR of the SRW.

The '25 is quieter and much smoother. The transmission is much better at gear selection for a given speed/throttle condition. It downshifts to keep the engine in the power band.
Surprisingly, the DRW rides smoother.
I do not observe an increase in engine power. I don't know if the new truck (<1000 miles) is somehow limited for break-in by the ECM, but it seems less powerful. The '24 was a beast. Even though the Aisin transmission was confused most of the time, the truck was a torque beast. You could really feel the push in your back when you gave it the beans. I don't get the same sensation from the '25.
I need to wait a few thousand miles on the '25 to see if it loosens up.

I will re-visit this as miles accumulate.

You’re likely feeling the difference in rear axle gears. Going from a 18 with 3.42’s to a 22 with 3.73’s the feel at low/mid throttle was huge and not being created by the increase in power that wasn’t being generated at low/mid throttle.

The gearing of the ZF can compensate, but the regular 2nd gear starts your starting overall ratio in the 24 was 25% lower and that’s going to be felt. It takes until 4th gear with the ZF to have a lower effective ratio when 1st is skipped.

The 25 HO only makes 10 more hp, so short of WOT and rated rpms you won’t feel much difference from that.

 

[Forceofwill]

I think the guys with 3500's that had HO's already for sure it will be a smaller difference. But us 2500 guys, this is a HUGE difference. It's been a while since I've driven an HD truck but as much as I remember this thing feels better than my '17 did with a delete, 5" and 130 tune. I'm extremely happy with how quick it is and it drives great from a stop without that crazy lag I remember.

 

[scdo]

I went from a '23 to '25 2500... agree it is a pretty big difference in power.

 

[regal2800]

I did at the end of May from Mark Dodge. I'm at 6800 miles now, chasing the National Hare and Hound and the West hare scrambles series even though I'm an old retired geezer of 65yo. Super pleased with mine, 99% of my miles have been hauling my slide in truck camper with a dirt bike strapped to the front or rear receiver hitch. Averaging mid-13 mile per gallon since purchasing. Running 65 to 85 mph out west going to races. I finally unloaded the camper and did a solo run a couple days ago out to meteor crater and back averaging 82 mph on I-40, probably 70 mile round trip. Had just rotated tires and had built up some soot with around town driving after my last trip DPF was at 1/3ish when I started my little round trip. Averaged 18-20miles per gallon going out then only 15 to 16 coming back. Apparently it went into active region because by the time I was home after my return trip my DPF % was back to zero. I was bummed that the spare tire that I rotated in did not include a TPMS sensor or it is not functional. My calculated diesel exhaust fluid consumption over the 6800 Mi thus far is 540 miles per gallon. I did an oil analysis after the first 1500 mile break in and I just drained the oil after my last adventure, should have results from the second oil analysis next week. Will post both sets of results here. View attachment 87582

Yes, I would like to see your oil analysis if you could post both of them at your convenience. thanks.

 

[gurdbonk]

Yes, I would like to see your oil analysis if you could post both of them at your convenience. thanks.

Received my second oil analysis back today for the run from ~1500 odometer to ~6700 odometer reading. 99% of miles from both the first oil analysis and the second analysis were somewhat loaded high speed super long distance runs.
After review of the viscosity, moly, boron, calcium values for the two tests, I have concluded the factory fill was Valvoline Blue 5W-40 and the second fill was me, using Rotella T6 and Fleetguard oil filter. The potassium level dropped to normal with the second analysis, and all the numbers were down or the same comparing the two results, the first result included the majority of breakin with the second result being 2.5 times as much runtime. So very pleased with the results. I started Archoil 6500 treatments since the 2nd oil analysis is perfect for the potassium concern (which ended up being flushed out bearing corrosion protection from the initial Cummins build), and I want my DPF to last as long as possible. Unlike a number of you in this forum, I am super pleased with the the emission system, the quiet of the '25 diesel, the lack of soot formation in the oil and the tailpipe. I plan to replace the key components as they wear out, and hope for a long life for the system. At this point in my knowledge/understanding, the only non stock replacement part will be an aftermarket EGR cooler engineered and built from the folks down in Phoenix area when the time comes. Wish y'all luck, enjoy your travels.

 

[regal2800]

This is good info, thanks.

 

[Bassman3871]

Curious to hear thoughts as to how it compares to the 2024. Thanks!

I traded my 2023 in for a 2025 DRW, it has a much smoother ride, shifting is great and quiet. The truck has enormous power. Everything about the new HD is better. I love it.

 

[Bassman3871]

And.... after 800 miles, the DPF injector broke and there is no eta on a new part. so it's sitting at the dealer collecting Ram dust.

 

[gurdbonk]

And.... after 800 miles, the DPF injector broke and there is no eta on a new part. so it's sitting at the dealer collecting Ram dust.

That is awful. You should consider contacting Ram Customer Service and open up a case, that if this isn't addresses rapidly you will be seeking a buyback to add additional pressure. They should be able to locate a replacement part someplace, even if they have to remove one from inventory at the manufacturing location in MX.

 

[Bassman3871]

I have submitted the request to customer service. Next step is a buy back! Not happy to say the least.

 

[sstoner911]

I drove one that a friend bought for a day. Definitely nice to tow with and daily driving. Its a huge up grade if you are coming from a SO Cummins or an older HO with 400 HP. That extra 30 HP is huge. If you have the HO with 420 horse, that extra 10 HP is noticeable but not much. The biggest change is the ZF trans. Overall it wasn't enough for me to trade my 2024 HO.

Just beware there are some electrical gremlins that 2025 owners are having.

1. Multiple Random error messages in the cluster
2. Truck wont shut off - owners have to pull the battery cables off.
3. truck wont start unless the FOB is held against the push to start
4. Bad RF Hubs and Wheel speed sensors
5. Seen some owners having issues with the DEF lines pooping off as well.

Not sure how wide spread these issues are , but my friend took his in in there was several TCM and BCM updates. SO just new RVs, trucks are a crap shoot if you get a good one.

 

[regal2800]

I drove one that a friend bought for a day. Definitely nice to tow with and daily driving. Its a huge up grade if you are coming from a SO Cummins or an older HO with 400 HP. That extra 30 HP is huge. If you have the HO with 420 horse, that extra 10 HP is noticeable but not much. The biggest change is the ZF trans. Overall it wasn't enough for me to trade my 2024 HO.

Just beware there are some electrical gremlins that 2025 owners are having.

1. Multiple Random error messages in the cluster
2. Truck wont shut off - owners have to pull the battery cables off.
3. truck wont start unless the FOB is held against the push to start
4. Bad RF Hubs and Wheel speed sensors
5. Seen some owners having issues with the DEF lines pooping off as well.

Not sure how wide spread these issues are , but my friend took his in in there was several TCM and BCM updates. SO just new RVs, trucks are a crap shoot if you get a good one.

you are correct, but just for clarification, #3 and 4 are the same item. the RF module controls both the FOB and tire pressure sensors.

 

[sstoner911]

you are correct, but just for clarification, #3 and 4 are the same item. the RF module controls both the FOB and tire pressure sensors.

Ya they are acytually fixes for numer 1 as well. There was another fix for number one which is a wiring harness by the rear diff that had poor connections.

 

[EGT75]

Curious to hear thoughts as to how it compares to the 2024. Thanks!

Bought a 2025 Ram 2500 Cummins Laramie with Rear Air Suspension. Used to have a 2019 Ram 2500 Cummins Limited. Use as a sometimes daily driver and to pull 8,000 lbs Travel Trailer mostly around Southeast and Appalachian Mountains.

Cab the same but still significant differences. All digital dash. The extensively revised HO engine combined with the new 8 Speed Transmission pulls strongly and much more smoothly. I like the relocated oil and fuel filters up top either side of engine and vastly improved intake design. Despite gaining 850 lbs of Payload to 2,932lbs, this Ram 2500 rides more smoothly. First thing my wife noticed.

Steering feels tighter and more precise. Of course, it pull the Airstream trailer effortlessly.

Only trouble I had was with DEF level gauge. It was wacho and the dealer replaced the tank / pump with the embedded level sensor. No problems since.

Have no intensions of making major mods. It runs great, looks level, and a lift would just degrade the towing experience.

 

[DarkHorse8]

Bought a 2025 Ram 2500 Cummins Laramie with Rear Air Suspension. Used to have a 2019 Ram 2500 Cummins Limited. Use as a sometimes daily driver and to pull 8,000 lbs Travel Trailer mostly around Southeast and Appalachian Mountains.

Cab the same but still significant differences. All digital dash. The extensively revised HO engine combined with the new 8 Speed Transmission pulls strongly and much more smoothly. I like the relocated oil and fuel filters up top either side of engine and vastly improved intake design. Despite gaining 850 lbs of Payload to 2,932lbs, this Ram 2500 rides more smoothly. First thing my wife noticed.

Steering feels tighter and more precise. Of course, it pull the Airstream trailer effortlessly.

Only trouble I had was with DEF level gauge. It was wacho and the dealer replaced the tank / pump with the embedded level sensor. No problems since.

Have no intensions of making major mods. It runs great, looks level, and a lift would just degrade the towing experience.
View attachment 88558

How much does that Airstream weigh?

 

[EGT75]

How much does that Airstream weigh?

2021 27' International GVWR = 7,600lbs

 

[DarkHorse8]

I currently have 4,000 miles of towing with it but nearly every mile has had a host of error messages on the display and the dealer cannot duplicate them when I take it in for service, super frustrating.

I’m hoping it all works out. I might wait until 2026 or until these bugs are worked out. Seams like a hit or miss since there are quite a bit of people who aren’t having issues.