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Drivetrain - 2011+ Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. Fifth generation and above...

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Old 08-13-2019, 09:22 AM   #1 (permalink)
DmaxCC6spd
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2020 HD Axle Ratios?

On the Chev & GMC sites, it lists the axle ratio as 3:42. Seem odd that they would go numerically lower, especially when I believe Ram offers 4:10.

Does anyone have a comparison chart of final drive ratios with the 3:73 axle and Allison 6spd comapared to the 3:42 and trhe Allison 10 spd?

The engine is already turning such low RPMs at reasonable interstate speeds, where will it run with this new combination? Does the computer lock out some of the gears in the trans when in tow-haul mode?

I got to see a GMC 2500 up close at my local dealership over the weekend. Looks like a beast of a truck!

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Old 08-13-2019, 09:27 AM   #2 (permalink)
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Thread relocated over to "Drivetrain - 2011+"



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Old 08-13-2019, 10:34 AM   #3 (permalink)
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Seriously? The final drive ratio is only part of the reduction in gearing from the engine output. When you factor in the ratios of the new transmission, it all works out.
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Old 08-13-2019, 11:00 AM   #4 (permalink)
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I already posted a chart that I made of the final drive ratios in another thread. As stated, the 3.42 ratio is part of an entire driveline package with a wider gearspread. It’s not like they added 4 overdrives and then also dropped the rear gearing. . . . . . .
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Old 08-13-2019, 12:48 PM   #5 (permalink)
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Quote:
Originally Posted by BanksLB7Duramax View Post
I already posted a chart that I made of the final drive ratios in another thread. As stated, the 3.42 ratio is part of an entire driveline package with a wider gearspread. Itís not like they added 4 overdrives and then also dropped the rear gearing. . . . . . .

Do you have a link to that thread?
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Old 08-13-2019, 01:07 PM   #6 (permalink)
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1st 3.094 - 11.540
2nd 1.809 - 6.747
3rd 1.406 - 5.244
4th 1.00 - 3.730
5th .711 - 2.652
6th .614 - 2.290
R 4.48 - 16.710


1st 4.54 - 15.526
2nd 2.86 - 9.781
3rd 2.06 - 7.045
4th 1.72 - 5.882
5th 1.48 - 5.061
6th 1.26 - 4.309
7th 1.00 - 3.420
8th .85 - 2.907
9th .68 - 2.325
10th .63 2.154
R 4.54 - 15.526
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Old 08-13-2019, 07:27 PM   #7 (permalink)
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capacity.html#post9817504https://www.dieselplace.com/forum/63...ml#post9817504

For those that want math...

With this you basically get better than 4.3 gear final,
AND you also get better than 3.73 gear final,

All in one transmission + it handles more torque...

Even lower first final of my MYD @3.73
4.03 1st
15.0319 final


So, what are we complaining about?
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Old 08-13-2019, 08:02 PM   #8 (permalink)
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I think one of the unmentioned reasons is that a 3.42 is physically stronger than a 4.11.
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Old 08-13-2019, 08:03 PM   #9 (permalink)
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https://www.thedrive.com/news/28619/...lb-towing-test

Not too shabby.
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Old 09-13-2019, 10:57 AM   #10 (permalink)
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I also found it interesting that the 1-ton is getting a new rear end (12 inch ring gear). The 3/4-ton is still the same 11.5.

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