The 6.4 HD Hemi Thread

[hemi1282]

Took my truck in today to get everything checked out cause its finna hit the 36k bumper to bumper warranty & get it aligned for the second time & they end up replacing all the tpm sensors there was a recall on'em, didn't know if you guys new or not I knew a lot of people has been having problems with the tpms

I've notise this morning i have 60psi n front tires and 70psi n rear and have no light comming on hmm

 

[Moparman2285]

Exes just don't last very long here in south east texas with all the crappy air from the refineries.

Now THAT is funny! So I did a search of the Klasse, and I put it and the Meguiar's Clay Bar/Showtime treatment on my wife's Amazon wish list. Hopefully she picks that up soon....

 

[Moparman2285]

Let us know how the mufflex goes. I can't stand drone, and a couple hundred miles of it while towing my travel trailer would drive be mad.

Add a note in fuelly, so you know the first fill-up with it installed. Then you can look back, and accurately say I lost/gained X mpg from it.

I see what you're saying, maybe I'll wait until I get a couple thousand miles on it before I install it. That way I have a "broken-in" baseline to compare the different mileages. It will be hard having that muffler staring at me every time I walk in the garage. Comparing all the different videos on Youtube, the Mufflex along with keeping my God-awful-looking resonator is probably the sound I'm after.

 

[Moparman2285]

On another note, sold my 2005 Hemi QC seen in my sig. First guy who looked at it is picking it up on Sat. That has been a great truck, but its time to move on....

 

[Wh87gta]

Can't believe I'm this torn. Going to go test drive a '15 2500 6.4 tomorrow. I own my own concrete business so I tow about 8-9k for about six months a year. Average I would say about 1-3 times a week. Not really hilly in east central WI. Just don't know if I should part with my 05 5.9 CTD at 140k. I love it but I also like new. Never had a brand new vehicle. I have learned a ton of stuff from everyone on here. Thank you to everyone that has posted. Took me a while to get through all the posts.








2005 Dodge Ram 2500 5.9 CTD, BDTD GT, S&B CAI, Bilstein 5100, Carli adj track bar, Thuren 2" level, FASS 150 Titanium, Cooper ST Maxx 285/70/17

 

[mikeysotp]

Can't believe I'm this torn. Going to go test drive a '15 2500 6.4 tomorrow. I own my own concrete business so I tow about 8-9k for about six months a year. Average I would say about 1-3 times a week. Not really hilly in east central WI. Just don't know if I should part with my 05 5.9 CTD at 140k. I love it but I also like new. Never had a brand new vehicle. I have learned a ton of stuff from everyone on here. Thank you to everyone that has posted. Took me a while to get through all the posts.


2005 Dodge Ram 2500 5.9 CTD, BDTD GT, S&B CAI, Bilstein 5100, Carli adj track bar, Thuren 2" level, FASS 150 Titanium, Cooper ST Maxx 285/70/17

That much towing, I'd think the diesel would be better. 8 or 9 mpg could get old really quick. I love my 6.4 but I still have major truck envy every time a see a Cummins!

 

[NewBlackDak]

That much towing, I'd think the diesel would be better. 8 or 9 mpg could get old really quick. I love my 6.4 but I still have major truck envy every time a see a Cummins!

With that much towing, I would agree.

 

[tjfdesmo]

I am well pleased with my 6.4 for my current needs, but I also had an '05 CTD before this, and I can tell you the heaviest thing I have pulled so far is my box trailer at(guessing)about 7K tops, and you definitely feel the weight getting the load going way more than with the Cummins. If you tow that heavy, that often I'd be thinking Cummins.

 

[cc rider]

6.4 with 4.10 is rated to tow 15k + I would imagine you shouldnt feel 7k . Or is that wth 3.73?

I was towing over that with the 5.7 . My toy hauler was 7k dry and it wasnt bad with my 1/2 ton and 3.92. Only on the hills you would really notice it. Of course this is taking off nice and slow.

I am well pleased with my 6.4 for my current needs, but I also had an '05 CTD before this, and I can tell you the heaviest thing I have pulled so far is my box trailer at(guessing)about 7K tops, and you definitely feel the weight getting the load going way more than with the Cummins. If you tow that heavy, that often I'd be thinking Cummins.

 

[Wh87gta]

Thanks for the advice! That is my concern. I know I can do about 13/14 on a tank with mostly towing and hwy I can pull 16-17. Best I've gotten was 19.8 on a 650 mi round trip. All hand calc.Biggest thing is the extra $$$ and not sold on all the emissions garbage past 100k miles. Especially with the long winters here. Takes forever for them to warm up even with it plugged in. I guess I have the itch for something new. Just don't want to regret it.

 

[loveracing1988]

6.4 with 4.10 is rated to tow 15k + I would imagine you shouldnt feel 7k . Or is that wth 3.73?

I was towing over that with the 5.7 . My toy hauler was 7k dry and it wasnt bad with my 1/2 ton and 3.92. Only on the hills you would really notice it. Of course this is taking off nice and slow.

Rated for it sure, but after watching the ike gauntlet test there is no way I would tow that much with the 6.4.

 

[cptwing]

6.4l 3500 DRW 4X4 REG CAB with 373 is rated at 12560, with 410 is 16060. The 3500 SRW and 2500 numbers are very similar.

 

[mikeysotp]

Rated for it sure, but after watching the ike gauntlet test there is no way I would tow that much with the 6.4.

I wouldn't tow that much there with a 6.4 either, but I can assure you that isn't a real world test. I'm gonna have to learn how to take some decent video and put something together on my first camping trip in 3 weeks. I think most people will be amazed at just how easily my truck tows my camper.

 

[Wh87gta]

So they're a nice truck! Not for me right now though. Even the sales man basically talked me out of it for what I need. He also didn't try talking me into a new 6.7 either. Said he just had someone replace their DEF system. $8000!! Ouch. I'll keep the 5.9 for now and see what happens.

 

[NewBlackDak]

I wouldn't tow that much there with a 6.4 either, but I can assure you that isn't a real world test. I'm gonna have to learn how to take some decent video and put something together on my first camping trip in 3 weeks. I think most people will be amazed at just how easily my truck tows my camper.

While I totally agree the truck handles my giant camper with no power issues, it does so at 7-10 mpg. That's a far cry from the 12-14 seen on the cummins.
…AND I seem to have one of the better mileage 6.4s.

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[cc rider]

That ike test is ridiculous. it's not meant to do that. If I was towing that much weight in mountains, I would definitely have Cummins. I would love to see member's tests preferably with 4.10 there are some posts that I have seen where people have pulled 13k 5th wheels with no problems On flat land though. I think one was even with the higher gears. Might have been a post on "the other place".

 

[cc rider]

Which gears and define giant

While I totally agree the truck handles my giant camper with no power issues, it does so at 7-10 mpg. That's a far cry from the 12-14 seen on the cummins.
…AND I seem to have one of the better mileage 6.4s.

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[cc rider]

isn't the payload difference at least 800-900 pounds. I wouldn't touch a big 5er with a 3/4 by the time you load up, you're over.

6.4l 3500 DRW 4X4 REG CAB with 373 is rated at 12560, with 410 is 16060. The 3500 SRW and 2500 numbers are very similar.

 

[wyo2track]

Here's the criteria on how the J2807 Tow Rating was established for the 6.4L. Attached is a link to the article that I pulled the info from. What I find interesting is trucks only need to maintain a minimum 40 mph on the Davis Dam grade. All low elevation running. Grade starts at 550 feet and goes up to 3500 feet.

SAE J2807 Tow Tests - The Standard

SAE J2807 Requirements
These are some of the main requirements of the SAE J2807 “Surface Vehicle Recommended Practice,” which lists the “Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight Rating.” The document detailing the test procedures and requirements is 27 pages long and includes tons of details we don’t have room to list. Here are some of the highlights.

Tow Vehicle Propulsion Requirements
Tow Vehicle Propulsion Requirements
Level Road Acceleration

Performance Attribute Performance Metric Requirement 0-30 mph 12.0 seconds single-rear-wheel/14.0 seconds dual-rear-wheel
Level Road Acceleration 0-60 mph 30.0 seconds single-rear-wheel/35.0 seconds dual-rear-wheel
Level Road Acceleration 40-60 mph 18.0 seconds single-rear-wheel/21.0 seconds dual-rear-wheel
Launch on Grade 12% grade, forward direction Five launches to 5.0 meters (16 feet) in 5 minutes
Launch on Grade 12% grade, reverse direction Five launches to 5.0 meters (16 feet) in 5 minutes
Highway Gradeability Minimum speed on grade (Davis Dam) 40 mph single-rear-wheel/35 mph dual-rear-wheel
Highway Gradeability Drivetrain system performance No component failures, no diagnostic codes that alert the operator, no customer warnings
Highway Gradeability Cooling system performance No component failures, no diagnostic codes that alert the operator to take service or driving action, no customer warnings, no fluid loss


Combination Handling Requirements


Performance Attribute Performance Metric Requirement
Tow vehicle understeer Understeer at lateral acceleration ≤0.3 g at 100% FALR <0 degree/g
Tow vehicle understeer Understeer at lateral acceleration ≤0.4 g at 50% FALR 0 degree/g
Tow vehicle understeer Understeer at lateral acceleration ≤0.4 g for weight carrying TWR (0% FALR) and for fifth-wheel and/or gooseneck TWR 0 degree/g
Trailer Sway Response Trailer sway damping ratio 0.10 at 100 km/h (62.1 mph)


Combination Braking Requirements


Performance Attribute Performance Metric Requirement
Combination Stability Deviation within lane Remain within a 3.5-meter-wide (11.5 feet) lane throughout stop
Combination Stopping Distance Stopping distance 20-0 mph for TWR 3,000 pounds ≤35 feet, except ≤45 feet at any TWR above the tow vehicle’s unbraked TWR
Combination Stopping Distance Stopping distance 20-0 mph for TWR 3,000 pounds ≤80 feet
Park Brake Performance Hold on grade 12% grade at GCWR (upward and downward)


Read more: SAE J2807 Tow Tests - The Standard

 

[NewBlackDak]

Which gears and define giant

4.10s

Trailer is 33 ft 3 inches long. 11'4" tall. 7800lbs fully loaded,
I the truck
550lbs of human in the , 50-100 lbs of generator(depends on if I need both), 50~150lbs of fuel(and can), couple hundred pounds of firewood and/or bikes.


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