Well maybe the truck builders are finally listening to the RV crowd for a change:Just got a brochure on the 2020 GMC HD trucks. 1. They have finally made the bed rails lower2. They have a bed camera to see your 5th wheel hitch.3. 10 speed Allison4. All types of options for camera views with trailerI know, it all costs money but at least it is avaliable. I may be in the market for a new one.

12th Man Fan wrote:Well maybe the truck builders are finally listening to the RV crowd for a change:Just got a brochure on the 2020 GMC HD trucks. 1. They have finally made the bed rails lower2. They have a bed camera to see your 5th wheel hitch.3. 10 speed Allison4. All types of options for camera views with trailerI know, it all costs money but at least it is avaliable. I may be in the market for a new one.I thought GM's new HD trucks are longer and taller. I'm surprised to hear they made the bed rails lower.

My dissapointment is their failure to offer adaptive cruise. I have grown to really appreciate its function while towing in heavy traffic. They are upping the bar though in other features like their camera system. Just reading about it makes me think they will have it all over Ford in that department. They seem to have a lot of well thought out features, plus increased payloads in the 2500's and 3500 single rear wheel. The 2500 diesel now has an 11,350 GVWR which is one ton territory.

I thought I'd love to have a 2020 GMC but....it looks like I'll have to come up with lots of money. https://www.cnbc.com/2019/06/25/chevy-is-working-on-what-could-be-the-first-pickup-to-top-100000.htmlAnd I understand the side ARE HIGHER, not lower and it is longer. Oh well, I'll stick with my F350 for a while.

JTrac wrote:My dissapointment is their failure to offer adaptive cruise. I have grown to really appreciate its function while towing in heavy traffic. They are upping the bar though in other features like their camera system. Just reading about it makes me think they will have it all over Ford in that department. They seem to have a lot of well thought out features, plus increased payloads in the 2500's and 3500 single rear wheel. The 2500 diesel now has an 11,350 GVWR which is one ton territory.My 2019 Ram 3500 has adaptive cruise and all the cameras as well

12th Man Fan wrote:3. 10 speed Allison3. GM 10 speed re-branded as an Allison. Fixed that for you.And Gig'em Aggies.

2020 GMC | Good Sam Community

RCMAN46
Explorer
Jul 03, 2019
Cummins12V98 wrote:
ksss wrote:
RCMAN46 wrote:
Cummins12V98 wrote:

Let’s not forget 700# lighter and 50% less tire drag.

I would like to see the math you used to calculate the tire drag.

Especially without having the drag coefficient of the asphalt. At least I assume he hasn't run a drag box across the Ike. But maybe...

FYI comprehension of what you have read is important. Dually has 6 tires and SRW has 4 that is 50% less "tire drag". We good now?

By some miracle the Chevrolet is a unicycle. The Ram system is 10 tires being drug down the road. 50% of that is 5. 4 tires for the trailer only leaves 1 tire for the Chevrolet.

With 10 tires for the Ram and 8 for the Chevrolet I would calculate this as only 20% less drag from the tires.

If you look at all of the things that are dragging the rotation friction from the wheels and tires is very small and can basically be ignored. Wind resistance is the major item another is friction in the engine. And as you have pointed out many times the v8 has 33% more moving parts than the inline 6.
ShinerBock
Explorer
Jul 03, 2019
Cummins12V98 wrote:
Shiner you just want to argue. My last DRW was 68RFE. It shifted good because right out of the box I ran the hell out of it and always used TH/EB. It certainly did NOT shift any better than the AISIN.

But hey what do I know since I HAVE owned BOTH.

And you like to constantly go out of your way to complain about Allison transmissions(which is why I started about the Aisin) that you never owned either so what is the difference? Don't start no **** and their won't be no ****.

Although, I have driven plenty of Aisin company trucks at work for many miles to know that they the DO NOT shift as smooth or as quickly as the 68RFE, Allison, or 6R140.
Dadoffourgirls
Explorer
Jul 03, 2019
Cummins12V98 wrote:
ksss wrote:
RCMAN46 wrote:
Cummins12V98 wrote:

Let’s not forget 700# lighter and 50% less tire drag.

I would like to see the math you used to calculate the tire drag.

Especially without having the drag coefficient of the asphalt. At least I assume he hasn't run a drag box across the Ike. But maybe...

FYI comprehension of what you have read is important. Dually has 6 tires and SRW has 4 that is 50% less "tire drag". We good now?

When I went to school, 50% of 6 was 3. 33.3% of 6 is 4.
Cummins12V98
Explorer III
Jul 03, 2019
Shiner you just want to argue. My last DRW was 68RFE. It shifted good because right out of the box I ran the hell out of it and always used TH/EB. It certainly did NOT shift any better than the AISIN.

But hey what do I know since I HAVE owned BOTH.
Cummins12V98
Explorer III
Jul 03, 2019
4x4ord wrote:
Huntindog wrote:
The video had a cutaway frame showing this.
It looked to me to be pretty close to 2".

Definantly NOT 5"

It could very well be that the hitch is only mounted 2 inches behind the rear axle..... in which case 3000 lbs placed on the hitch would take 38 lbs off the front axle. (On a CC short box)

As I mentioned on the other thread I will bet the centerline of ball is MORE than 2". That would make 100#. What is the distance in inches from axle to axle?
Cummins12V98
Explorer III
Jul 03, 2019
ksss wrote:
RCMAN46 wrote:
Cummins12V98 wrote:

Let’s not forget 700# lighter and 50% less tire drag.

I would like to see the math you used to calculate the tire drag.

Especially without having the drag coefficient of the asphalt. At least I assume he hasn't run a drag box across the Ike. But maybe...

FYI comprehension of what you have read is important. Dually has 6 tires and SRW has 4 that is 50% less "tire drag". We good now?
ShinerBock
Explorer
Jul 03, 2019
Cummins12V98 wrote:
ShinerBock wrote:
Cummins12V98 wrote:

Have I criticized GM because they would not admit the strength of their 6 speed was not op to the task and gave a LAME excuse of why their DRW could only pull 23,700#? HE!! yea!

And you will not admit that the Aisin is a slow and clunky transmission even though multiple review sites and people in the forums has stated this so what's the difference?

I would rather take a 6-speed Allison over an Aisin. Big whoop that it is only rated to tow up to 23k. Most people here, myself included, will never tow close to that much and would probably rather have a better shifting transmission with better shift points rated to tow up to 23k over a slow and clunky trans rated to tow 30k.

How bout this. Come drive mine at 10k solo and then at 35k double towing. Then tell me what you think.

What trans do you have? Oh yea NOT AN AISIN.

Why? I don't tow that much and neither does 99.9% of the people here so why would I choose a slower and clunkier transmission rated to tow 35k when a quicker, smoother, and better shift logic transmission is rated for well over what I and most people tow.

That is like buying a rough riding and slow Peterbilt 325 to tow a 20k trailer when a smoother, faster, and more comfortable 350/3500 pickup truck will do. I can't speak for you, but I for one don't need anything I have rated to tow some amount that I will never tow to compensate for other deficiencies. I also don't believe that everything is the best at everything with no flaws just because I own it.
ib516
Explorer II
Jul 03, 2019
Huntindog wrote:

I was told by a long time GM engineer years ago, that when they tried 4.10s behind the D/A that the pinion would not hold up.

That may be why the AAM went from 11.5" to 11.8" to 12" over recent years.
4x4ord
Explorer III
Jul 03, 2019
The fulcrum is where the tire meets the road. It makes no difference where the springs bolt to the frame. If the axle moves relative to the hitch while it is loaded then the distance from the pin to axle as well as the wheel base will change slightly. So to be 100% accurate the measurements would be taken with the load on the pin. Loading the truck isn't going to change these dimensions a whole lot. For instance I'm certain the axle is not going to move forward relative to the frame three and a half inches when the springs are loaded, which is what would be necessary for the load to lift 100 lbs off the front axle.
Huntindog
Explorer
Jul 03, 2019
4x4ord wrote:
Huntindog wrote:
Groover wrote:
Cummins12V98 wrote:
Grit dog wrote:
Cummins12V98 wrote:
Gooseneck hitch behind rear axle centerline. How stupid.

Yeah it must be waaaay back there to only be rated to tow 35k!

Lofl. Some people would bitsch and complain if you hit em upside the head with a bag of money...
.

Industry standard has been in front of axle for ever. Dumb to unload front axle.

The effect of loading/unloading the front axle varies with how far you are from the axle. We are talking 3 or 4 inches here vs maybe 50 or more with a bumper pull and most new trucks are rated to carry some astonishing weights on the bumper. You probably won't notice the small change here. However, with the trend towards short bed pickups smacking the back of the cab has become a real issue. A few inches backwards will make a huge difference on that. I hope that doesn't sound too much like a certain politician.
I think the video said it was 2"

The video did say two inches behind the center of the rear axle. It also said 3000 lbs of pin weight unloaded 100 lbs off the front axle. That doesn't add up. If 3000lbs of pin weight lightened the front axle by 100 lbs the pin would have to be positioned 5.3 inches behind the rear axle on a short box crew cab and even further back on a long box crew cab.
I think a few things are screwing up your calculations.

Thae axle is NOT bolted to the frame.
It is bolted to the springs which are bolted to the hangers which are bolted to the frame. So the spring hager locations are where the frame "sees" the weight.
The video actually touches on this.
In addition:
The axle MAY not be centered on the leaf spring.
AND just to muddy the water a little more, the springs lengthen and shorten as weight is added/removed... So the axle will move for and aft a bit.

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