Truck has low power

[slbenz600]

I have 2015 Ram 2500 4X4 Laramie 6.4L Hemi, two different dealerships service deparment told me there were no codes in the system. After changing out the spark plugs my mileage never increased, put this so people will understand ( VW Beetle) will out run this truck. The fuel mileage sucked at between 5 to 8 mpg, I started running Hemi's in 1956 with a 273 Hemi 4 barrel carb that would out run the 327 chev with no problem and fuel mileage 20 plus depeding on where my foot was and electronic & fuel injection is better ? BS.
I only done one mod, I took my truck to a muffler shop and after much talking I convinced them to cut that smashed pipe behind the cats and put 3 inch pipes with two mufflers to rear of truck I increased to 15 mpg that was a plus except to go power.
When my truck tued 155,000 miles the trans decided to stop working, after them replacing the trans with the correct one for the truck according to Ram. This truck was ordered by the original owner to tow a 10,500 lbs fifth wheel trailer 5 or a 7 Ram put in a 3. ( these trans has a designation that has 3, 5 or 7) the 5 should never tow that much weight.
Because of the trans and installing the correct trans, I had to pay approximately half the value of the truck, WOW.
The power is completely different.
My guess is that the wrong trans was installed and with the gentelman towing what he ordered the truck for screwed up the trans causing not allowing the truck to perform correctly. Unfortantly the concusmer is the one taking it in the rear not Ram.
I have purchased so many Chrysler products, this truck has so many problems that the dealer no the company would address, if I was to pay for the repairs I would have paid out more than the value of the vehicle.
Hope this will help someone with the same issuses I had.

 

[06 Dodge]

Say what?

 

[Curmudgeon]

 

[06 Dodge]

Can any one understand just what the OP was talking about as it jumps from 273 Hemi to 327 Chev then to mpg then transmission problems???

 

[Curmudgeon]

Can any one understand just what the OP was talking about as it jumps from 273 Hemi to 327 Chev then to mpg then transmission problems???

You forgot "power"

 

[Marshall]

The baby hemi I know, had one, the 327 was in a Massey combine.
Transmission in a 2500, I don't have a clue what the hell you are talking about.

 

[Hagar1]

The baby hemi I know, had one, the 327 was in a Massey combine.
Transmission in a 2500, I don't have a clue what the hell you are talking about.

I think that he doesn't either ........

 

[huntergreen]

I’m guessing the power issue is caused dirty fuel injectors or his fuel pump is on its way out.

 

[Dusty]

Recognizing that writing composition isn't everyone's forte, a recommendation for new and seldom users of this site.

Start with making sure there's a good vehicle description (year, engine, model, miles, and equipment pertinent to the issue), and then describe the symptom/problem. The vehicle history can follow. This will usually prevent unnecessary follow-on questions from residents. Without good info up front it may discourage responses from this very talented and helpful group.

Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 133507 miles.

 

[DA Smith]

One thing I can tell everyone is there's no such thing as a 273 Hemi from the fifties or any other time in MOPAR history. There was a 273 small block that was introduced in 1964 and was available in a standard two bbl or a high performance 4bbl with a few internal up grades! I had a 65 Dodge Dart with the 273 4 bbl 4 speed sure grip differential. This little small block was a stout running engine and would out run many larger displacement engines! I understand this part of the OP post! The part about adding three inch piping and two mufflers I also understand and this could be some of the issue with power loss! Engineers design exhaust to complement the engine they are installed on from the factory to give a certain amount of back pressure for optimum performance from the engine which includes power, if you change up to a much larger exhaust on the stock engine you lose the back pressure designed for the best performance. If you take this same engine and do a build where it's bored out add higher compression different heads for better flow different cam and so on you now have a much larger and more powerful engine that you will want to upgrade to larger exhaust to compensate for the added up grades.

 

[ppine]

Maybe towing a 10,500 pound trailer and 155k on the clock have something to do with your "loss of power."
What is the compression like? Are your valves functioning correctly? Sound like engine failure.

 

[Hagar1]

I have often wondered about the stator in the torque convertor. It is supposed to be able to "free wheel" when the torque convertoris in the rotary flow condition. If the one way clutch happened to seize, the convertor would actually impose an additional load on the engine. It won't be noticeable until at higher RPM. Just a thought.

 

[Dean2]

That isn't just day drinking, there are some seriously good chemicals mixed in there too. Any more it would be Narcan time. Will be interested to hear the actual story, IF he remembers he posted this, when he comes down.

That said, there were hemis in the 50s, I had a 1957 Dodge Royal with one. Do not recall a hemi as small as the OP described, thought chrysler did make a 273 V8 that put out some serious power in the 60s, I don't recall it being a hemi.

Dodge did offer a straight-six engine in 1957; however, the Custom Royal came from the factory with a standard four-barrel-topped 325-cu in mill that produced 260hp and 335-lbs ft of torque from its 3.69 x 3.80-inch bore and stroke and 8.5:1 compression. It was dubbed the Super Red Ram.

But if a customer had the desire for more power, the option chart offered several solutions, beginning with the D-500: a 325-cu.in. block with Hemi cylinder heads and a 9.25:1 compression ratio that developed 285hp and 345-lbs ft of torque. The highly desirable Super D-500 (technically the D-500-1), with its Hemi heads and dual four-barrel carburetors, made 310hp and 350-lbs ft of torque.

Finally, there was the ultra-rare D-501 package: a 340hp 354-cu in Chrysler Hemi block, borrowed from the record-setting 1956 Chrysler 300-B. The D-501s were essentially purpose-built race cars offered to meet a homologation rules package, but the reported run of 100-odd engine/car combinations was never completed. Today, only a few are known to exist out of a mere 56 (including three convertibles) that were built.