stock 4:10 rear end - Page 2 - Chevy and GMC Duramax Diesel Forum
Drivetrain Discussion on gearing, CV joints, driveshafts, axles, brakes, etc.

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Old 12-03-2012, 04:02 PM   eBay Motors  #11 (permalink)
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Quote:
Originally Posted by jc1843 View Post
The factory axle gear for a Duramax is 3.73. They list a 4.10 gear as stock for the 3/4, but when you opt for the Duramax, it automatically changes to the 3.73.

Some cab and Chassis could be ordered with the 4.10, but not the regular trucks. I believe that with the new LML you can order the 4.10 gear for a truck.

The rear axle gear on a Duramax is 11.5 inches and 14 bolt cover, it is a strong axle. The gas axle might be smaller gears, and I doubt they would handle the torque of a diesel.
While most would consider going to a 10.5 a step backwards, they are VERY tough rear ends, and stock for stock considered stronger than the "legendary" Dana 80.

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Originally Posted by rikshaw View Post
is there a problem with that ?
Yes and no. If its out of a 6.0 2500hd, its a 10.5 14 bolt. I would think it would hold up just fine to a mildly tuned truck with big rubber as long as your not constantly towing heavy.
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Old 12-03-2012, 04:40 PM   eBay Motors  #12 (permalink)
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That's true. And the 8.1L does come with 4.10s and the 11.5" 14 bolt.

Randy's Ring and Pinion has gear sets fairly affordable if you're looking to re-gear, and probably a few vendors on here would have something, too.
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Old 12-03-2012, 06:02 PM   eBay Motors  #13 (permalink)
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Quote:
Originally Posted by jc1843 View Post
The factory axle gear for a Duramax is 3.73. They list a 4.10 gear as stock for the 3/4, but when you opt for the Duramax, it automatically changes to the 3.73.

Some cab and Chassis could be ordered with the 4.10, but not the regular trucks. I believe that with the new LML you can order the 4.10 gear for a truck.

The rear axle gear on a Duramax is 11.5 inches and 14 bolt cover, it is a strong axle. The gas axle might be smaller gears, and I doubt they would handle the torque of a diesel.
Nope, LMLs still come with 3:73 gears. You can not order 4:10 gears from the factory on the LMLs. That includes the new 2013s.
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Old 12-03-2012, 06:07 PM   eBay Motors  #14 (permalink)
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Quote:
Originally Posted by Hotdogstand View Post
That's true. And the 8.1L does come with 4.10s and the 11.5" 14 bolt.

Randy's Ring and Pinion has gear sets fairly affordable if you're looking to re-gear, and probably a few vendors on here would have something, too.
The interesting thing is that back when I was ordering my 2003 with the 8.1 with the 4:10 gears it was rated to pull the same as the LB7 Duramax.

IMO the 8.1 is the best Big Block. I could out run and tow the Ford and Dodge V10s all day. I wish they still offered had the 8.1 with Allison 6-speed....damn gas prices.

There is talk of a new BB for the HD trucks for 2014. But still, now that I have a Duramax I will never go back to gas.
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Old 12-03-2012, 07:12 PM   eBay Motors  #15 (permalink)
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Thank you everyone for the info i dont have a hole lot of experiance with the gears and axles and if i regear i want to do it right so thank you its very appricated sorry for the spelling.
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Old 12-04-2012, 10:50 PM   eBay Motors  #16 (permalink)
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my 2012 2500 Denali Dmax came with the .410 from the factory..

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Old 12-04-2012, 10:52 PM   eBay Motors  #17 (permalink)
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Originally Posted by DenaliDuallyHD View Post
Nope, LMLs still come with 3:73 gears. You can not order 4:10 gears from the factory on the LMLs. That includes the new 2013s.
that is incorrect sir.. my 2012 2500 Denali Dmax came from the factory with the .410 rear end..
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Old 12-05-2012, 03:32 AM   eBay Motors  #18 (permalink)
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Originally Posted by TX-GMAN View Post
my 2012 2500 Denali Dmax came with the .410 from the factory..
Sorry but that is hard to believe. I would double check your build sheet or the window sticker again. If it is true and you have 4:10s, than you have a one of a kind D-max.
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Old 12-05-2012, 01:16 PM   eBay Motors  #19 (permalink)
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Technically the 4.10 is slightly weaker than the 3.73's the pinion head is slightly smaller and the contact area of the teeth is less, Now realistically this is pretty insignificant considering some of the gear sets available for these units and really means nothing in terms of actual strength. If you are going to the 10.5 then your still not really giving anything up and it is a more easily serviced axle if you do ever blow up a gear set, with the removable pinion they are a lot easier to change and you spend a lot less time under the truck.
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Old 12-06-2012, 02:15 PM   eBay Motors  #20 (permalink)
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Originally Posted by ironman_gq View Post
Technically the 4.10 is slightly weaker than the 3.73's the pinion head is slightly smaller and the contact area of the teeth is less,
I think you have this wrong, more teeth on the ring gear means more teeth in contact (full or partial)with the pinion at any given time. The ring gear is the weaker of the two. The mechanical advantage of the shorter gear set also means the crown and pinion will not work as hard. It will be stronger or able to handle more power then a 3.73. However there will be more stress(torque) on the axels and the differential gears(locker/posi/what ever) with the shorter(4.10) set.

I agree with you that it is all really insignificant and he would be fine with either ratio.
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