Newer Chevy 2500HD rear diff ratios and engine differences?

We bought a 2015 GM HD - 6.0L w/4:10 ... Moved up from a 2003 w/6.0 and 3:73. Was very happy with the 2003 gearing, and disappointed that 3:73 was unavailable for the 2015 ... BUT, have changed my mind - the 6.0L/6 speed/ with 4:10 is an excellent setup. Now, if I had it to do again, I'd forget the 3:73 even if available.

We get 16+ mpg empty and between 11-12 mpg hauling a 3500 lb truck camper - and sometimes a 2900 lb cargo trailer at the same time. Very sweet match up ...

I'll clarify that I will be buying a used truck, probably 2013 or newer but thanks for the offer, Dadoffourgirls. Why a 3500 over 2500...just the payload difference? I'm assuming the drive train is the same between a 2500 and 3500, correct?

GeoBoy wrote:
If you are going to move into a new/newer GM truck, go with a 3500 and the 6.0 gasser with 4.10 gears. With the 6 speed transmission you should see 1 mpg better, both city and highway. Thank you for your service.

YES

Hi If you want to order your new 2500 as a crew cab, I can get you the number to call for a customer build. You come to the plant and see your truck being built and ride off the end of the line in your new truck!! It's a great experience and you get to meet all the great people that help build your truck. Pete Electrician GM Flint Truck Asm.

BenK wrote:
A bit out of context...gotta know the ICE's torque/HP/RPM curve...where you wish to be towing/cruising/etc in RPMs...the tranny gears you wish to likewise tow/cruise/etc at

Then the tire's rev's per mile factor all this

Take my 7.4L big block gasser.

Red line is solid at around 4,800 RPMs with a dash red line starting around 4,300 RPMs



A small block can rev a couple thousand RPMs higher all day where mine would blow up

Gotta know where you wish your RPMs to be at while towing/cruising/etc...

Or you could just say get 4.10s for towing cause they're better when you don't have unlimited power under the hood....

A bit out of context...gotta know the ICE's torque/HP/RPM curve...where you wish to be towing/cruising/etc in RPMs...the tranny gears you wish to likewise tow/cruise/etc at

Then the tire's rev's per mile factor all this

Take my 7.4L big block gasser. Max torque is attained around 1,400 RPMs and continues at that level till about 3,800 RPMs

Red line is solid at around 4,800 RPMs with a dash red line starting around 4,300 RPMs



Over sized tires by about 7%, so the indicated speed is slow by about that amount. Indicates about 65 MPH, but actual is a bit over 70 MPH on this image

A small block can rev a couple thousand RPMs higher all day where mine would blow up. A diesel is similar to my big block gasser

Gotta know where you wish your RPMs to be at while towing/cruising/etc...

If you are going to move into a new/newer GM truck, go with a 3500 and the 6.0 gasser with 4.10 gears. With the 6 speed transmission you should see 1 mpg better, both city and highway. Thank you for your service.

If you need a GM Friends and Neighbor certificate to get GM supplier pricing, let me know.

The current 2500HD has the 4.10 standard, and no option. The 6 speed will help some in fuel economy.

The 6-speed transmission is a big step up, that you will notice. I think the newer GM 2500 6.0 has 4.10 gearing standard, maybe can order 3.73, but I would not.

Jerry