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 > Ram 6.4L Hemi vs good ol' 8.1L

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Bend

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Posted: 02/10/18 10:26am Link  |  Quote  |  Print  |  Notify Moderator

I didn't read all the posts but will input my impressions/experiences. Mine has the 3.73, my trailer loaded is around 8500 - 9k. I live at 4000. Towed from California into Oregon, and never had a problem. When I did that, trailer was fully loaded with household items and truck bed was also fully loaded with household items (furniture, books, etc.). When I approached the mountain grades, I locked it into 3rd and was able to maintain 60 mph at around 3200 rpm. In my opinion it did as good as my old PS 6.0. I was quite pleased. Over the passes I averaged around 8 mpg.


2015 Ram 2500 Laramie Crew Cab 4x4 6.4l Hemi to pull my Prime Time Lacrosse 296BHS
"Overstating the Obvious rarely helps the Oblivious!"

wilber1

Abbotsford B.C.

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Posted: 02/10/18 11:30am Link  |  Quote  |  Print  |  Notify Moderator

VernDiesel wrote:

This has been covered a few times here. Ram hasn’t done the 8 speed in an HD because the parking paw is not rated strong enough to hold a truck & trailer to rated capacity on a hill. .


Thanks, good to know. Hopefully they can resolve it, the 8HP is one hell of a transmission and actually has fewer parts than the 6 speed.

I also think anyone who relies on a parking pawl to hold the truck and trailers rated capacity on a hill is just asking for trouble.

* This post was edited 02/10/18 09:57pm by wilber1 *


"Never trust a man who has not a single redeeming vice" WSC

2011 RAM 3500 SRW
2015 Grand Design Reflection 303RLS

ib516

Way up north eh

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Posted: 02/10/18 04:30pm Link  |  Quote  |  Print  |  Notify Moderator

blofgren wrote:

campingken wrote:

Send a PM to ib516. He owned a 6.4 with 4.10 gears that he was very happy with. Before he bought this truck he did a post on why he chose the 6.4 over a diesel (his previous truck was a 5.9 Cummins).


x2. He has several good Youtube videos on it as well.

Here I am!

Yes, I enjoyed my Ram 6.4L Hemi/4.10 combo. I pulled a 12k 5er with it, ran at 21k GCW. It did fine. There was only one time I tried accelerating pulling a grade and couldn't with my foot flat on the floor. You can't be afraid of high RPMs when pulling though. Mine ran in 4th or 5th, never 6th. Mpg was about the same in 4th or 5th while pulling, 7-9 mpg, usually 8 mpg hauling the 5er. It was a 37' unit with 3 slides. (Cougar in sig). For reference, the previous 5.9L Cummins/Megacab/3.73/3500 SRW got about 10 or 11 mpg hauling the same 5er, so about 2 mpg better. It also did 2-3 mpg better when running empty, and used much lower RPM while towing.

The truck would do over 60 mph in 2nd gear, so if you lost speed on a grade (to 45-50 mph before downshifting), it would downshift to 2nd gear and get up to 5500 RPM or so before shifting to 3rd. The 1-2 gap folks have mentioned only comes into play when accelerating from a stop, and it's only noticeable when loaded. The engine RPM drop just a bit too much from 1st to 2nd, and it takes about a second to recover and climb back into the power band where the engine RPMs start climbing again. It is noticeable, but not a deal killer.

Empty, in perfect conditions, it would do 18-20 mpg, but was usually around 15-16 mpg at 65 mph. I was pretty impressed with the mpg actually considering it had 4.10s and it is a big truck.

Performance was excellent, towing or not. Really happy there. I pulled up and over every grade I could find in the Canadian Rockies with mine.

I would buy another 6.4/4.10 truck in a heartbeat if I needed a 2500 truck. I have a small hybrid now, and will likely not get anything much bigger, so a 1500 will do me when I can afford to upgrade.


Prev: 2010 Cougar 322QBS (junk)
02 Dodge 2500 4x4 5.9L CTD 3.55
07 Dodge 3500 4x4 SRW Mega 5.9L CTD 3.73
14 Ram 2500 4x4 Crew 6.4L Hemi 4.10
06 Chevy 1500 4x4 E-Cab 3.73 5.3L
All above are sold
Current: 07 Dodge 1500 5.7L Hemi 3.55 / 2010 Jayco 17z


ib516

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Posted: 02/10/18 04:43pm Link  |  Quote  |  Print  |  Notify Moderator

Just for comparison purposes...

8.1L is 340hp @ 4200 RPM / 455tq at 3200 RPM. (Was the 8.1L in the Burb rated the same as the pickups?)
6.4L is 410hp @ 5600 RPM / 429tq at 4000 RPM.

VernDiesel

Dayton OH

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Posted: 02/11/18 02:45pm Link  |  Quote  |  Print  |  Notify Moderator

Wilber I swear if I found a 6.4 truck with a bad transmission I would try to see if the 8 speed could be made to work. You would get measurably better mileage & towing out of it. Like not 1 or 2 percent but 10 & possibly up to close to 20 percent in some scenarios. Didn’t the 5.7 in the 1500 get over 10 percent better economy. Plus it became a much more proficient tower from the better gear spacing even when useing taller 3.21 & 3.55 gears for better highway economy. You gain on both fronts. I could live with wheel chalks & avoiding parking on a hill when towing heavy.

Ib516, Cool. 440 HP 4,700ish & 490 TQ 3,500ish ie not requiring anywhere near Hemi rpms from upgraded rebuilt tow tune. Not to knock the Hemi it’s well built with quality forged internals. I like the old reliable 6.0 also but it’s just weak. Ford’s V 10 was another good reliable tower as was the old Cadillac 472/500 with a 4l80. Sorry was reminiscing.

http://www.raylarengineering.com/vortec-8100-496cid-truck-performance-parts.html

Hmnn can’t get link to work type this. Www.raylarengineering.com

* This post was last edited 02/11/18 09:58pm by VernDiesel *   View edit history


Transportn Airstreams TT boats Mfg 2 dealer RAM EcoDiesel factory brake controller tow mirrors hitch camera receiver 1,290/12k no-sway WDH Axle to frame air bags Tune w turbo brake, Max tow 9,200 CGAR 7,800 CVWR 15,950 axle weights 3,340 steer 2,260 drive

Camper G

Pennsylvania

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Posted: 02/12/18 04:53am Link  |  Quote  |  Print  |  Notify Moderator

BurbMan wrote:

Had the flu this week so spent a lot of time sitting around watching TV and Googling stuff....I got to thinking that my next truck will probably be a well-equipped Ram 2500, crew cab, 6'4" bed, with the 6.4L Hemi.

The real question is the drivetrain....I thought briefly about the manual transmission, but the traffic around here has gotten so bad I'm afraid I don't have the patience to shift anymore. After losing 2 automatics while towing, it seems to make sense though....

I don't tow far enough or heavy enough to need a diesel, TT loaded is not quite 9k lbs. I'm thinking the 6.4 with the 4.10 rear would make a nice combo.

So obviously the Big Question is, how will it tow compared to the 8.1/4.10 combo I have now? How is the 68RFE transmission, is it durable?

I'm also not seeing ram boxes or an IBC option, are these not available on the power wagon?

The other big question is how recent model years stack up....ideally I'd like to get 14-16 truck that somebody else had paid the depreciation on.

Would appreciate any pointers from guys who know the Ram truck line...


BM,

I'm towing 6k with my 17/6.4/3.73 combo and I'm very happy with it. Plenty of power in the mountains and the chassis is solid. I'd look to get as new/low mileage truck as you can. Look new, if you buy at the right time of year you can get great incentives that you could probably get brand-new for the money you'll spend on a 2yr old truck. They hold their value so well.

I don't mind the transmission. It's world's better than the 6 speed my 2015 Silverado had. I don't miss that Chevy at all with this ram and I have a tradesman. Good luck. All 3 of the big 3 build great trucks. It's all personal preference. I like Ford and Ram the best, but that's just me.


2017 Dodge Ram 2500 HD, 4x4, CCSB, 6.4L HEMI, Snow Chief, tow package.,1989 Skyline Layton model 75-2251.

proxim2020

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Posted: 02/12/18 10:38am Link  |  Quote  |  Print  |  Notify Moderator

I have a '18 6.4L DRW. The current TT is 8,500 - 9k and I get about 8.5 mpg while towing. I'm averaging 13.5 mpg in the city and 16.5 on the highway. MPGs could be better if I had less "fun" in it lol. I've towed up a few 12% grades and it scooted up them just fine with no drama. The 1st to 2nd gear gap is noticeable, but not something that bothers me.

When it came to trims we debated between the SLT and the Lone Star levels for a while. The SLT gives you a good amount of features standard and the Lone Star give you just a little bit more. She sat in a Laramie and instantly fell in love with it. I enjoy my current sleeping arrangements so guess what we got[emoticon]

BurbMan

Islip, Long Island

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Posted: 02/12/18 11:34am Link  |  Quote  |  Print  |  Notify Moderator

LOL I hear ya! I was joking about the Lone Star because I'm a NYer, not a Texan. I have been looking at the Laramie, though. Proxim, your TT sounds almost exactly like mine weight wise. The 1-2 shift gap doesn't really concern me too much, since I've only got a 4-speed trans now.

In fact the 4L80E ratios in the Burb are 2.48, 1.48, 1.00, 0.75, and in the 66RFE are 3.23, 1.84, 1.41, 1.00, 0.816, 0.625.

So what you guys are saying is a big 1-2 gear jump is actually better than what I have now. I've always felt I needed another gear between 2 and 3, and this does it. The 66RFE doesn't hit 1.00 until 4th, where I hit it in 3rd now, plus I have 2 OD gears instead of 1 so that's what helps the empty mileage a lot.

IB, I forgot you had posted extensively about this truck when you got yours, and I remember now ow impressed you were with its towing abilities.

Thanks for posting this:

ib516 wrote:

8.1L is 340hp @ 4200 RPM / 455tq at 3200 RPM.
6.4L is 410hp @ 5600 RPM / 429tq at 4000 RPM.


I just looked at the GM offerings, and the 6.0 is 360hp/380tq, reminding me of why I didn't buy it back in 2001. The DMax diesel puts out the real power, but it's an $11,000 premium!!! Sorry, but that doesn't make sense for me for the number of times I tow the TT....at this point in my life the truck is 5x more likely to be spotted at Home Depot or with an equipment trailer behind it than at a CG....


2001 Suburban 2500LT 8.1L/4.10
2008 Terry TT
Hensley Arrow Hitch
Dill TPMS, CorrecTrack alignment, LT tires


Frostbitte

Edmonton

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Posted: 02/12/18 12:55pm Link  |  Quote  |  Print  |  Notify Moderator

wilber1 wrote:

I really don't understand why Ram offers the 8 spd with the 5.7 1500 and not with the 6.4 2500. They come in models that can easily handle the 6.4's torque. In fact it is the automatic option on the Hellcat which produces 650 lbft.


Rumour has it that the 8-speed for the 6.4 2500 is in the works. Don't have any specifics or dates though...


2011 RAM 3500 Laramie 4x4 6.7 Cummins 6-speed Auto 4.10
2004 Prowler 275 CKS (Sold)
2014 Sabre 36QBOK-7 5th wheel
2016 Forest River 8 x 20 Cargo Trailer

ib516

Way up north eh

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Posted: 02/13/18 05:50am Link  |  Quote  |  Print  |  Notify Moderator

Frostbitte wrote:

wilber1 wrote:

I really don't understand why Ram offers the 8 spd with the 5.7 1500 and not with the 6.4 2500. They come in models that can easily handle the 6.4's torque. In fact it is the automatic option on the Hellcat which produces 650 lbft.


Rumour has it that the 8-speed for the 6.4 2500 is in the works. Don't have any specifics or dates though...

I realize it's a different application, but if they can makes the 8 speed able to hold 800hp in the demon, they should be able to make it survive towing duty.

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