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Jan 23rd, 2013
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Duramax Gear Ratio #12704264
04/05/18 03:57 PM
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Cypress Texas
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Bryan O' Offline OP
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I'm about to get a new Duramax 2500 Z71 LTZ. This will be my 3rd. I see that most of them are either 3.73 or 4.10 Ratios. I'm not sure what mine is, and the door edge sticker codes aren't clear. I'd like to get the same that I presently have. I typically am pulling my boat, but occasionally a 38' travel trailer, and a 20' trailer with a 75 hp Deere tractor. Will be pulling the travel trailer more as time goes on, but still most of the time just my brief case. I'd like to figure out what mine is. Can anybody tell what code indicates the gear ratio? I'm leaning towards a 3.73 for the better mileage. Thanks for your help.


Bryan O'
Total Recreation Products Inc.
Commercial Park and Playground Products and Services
totalrecreation.net
Ranger Z520 250ProXS
Re: Duramax Gear Ratio [Re: Bryan O'] #12704316
04/05/18 04:27 PM
04/05/18 04:27 PM
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Oeste Del Tejas
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http://www.crawlpedia.com/rpo_axle_codes.htm


To find the axle gear ratio of any GM vehicle, locate the RPO sticker (typically located in the glove box) and write down any codes starting with F, G, or H. Then, find those codes in the table below.

Re: Duramax Gear Ratio [Re: Bryan O'] #12704324
04/05/18 04:31 PM
04/05/18 04:31 PM
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redchevy Offline
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I don't believe GM has ever made a duramax with anything other than 3.73 gears. 4.10's are an option but when you select the duramax engine that option goes away and you get 3.73's as the only available offering.

Re: Duramax Gear Ratio [Re: Bryan O'] #12704451
04/05/18 06:08 PM
04/05/18 06:08 PM
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Bryan O' Offline OP
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Thanks for the link Samson. Looked it up, and mine is a 3.73 Red, 3 of the 8 2500 Duramax's at my local dealer are 4.10's. Might be an 18' thing. I'm going to stick with a 3.73. Unless you pulled a backhoe I can't imagine needing 4.10's. That 75 hp. Deere, or a 70 hp track skid steer are easy enough for mine with 3.73's.


Bryan O'
Total Recreation Products Inc.
Commercial Park and Playground Products and Services
totalrecreation.net
Ranger Z520 250ProXS
Re: Duramax Gear Ratio [Re: Bryan O'] #12704652
04/05/18 08:26 PM
04/05/18 08:26 PM
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redchevy Offline
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Are you looking online? I bet its an error or typo.

Just looked on their website, with the duramax comes 3.73 gears only way it comes.

Last edited by redchevy; 04/05/18 08:29 PM.
Re: Duramax Gear Ratio [Re: Bryan O'] #12704728
04/05/18 08:58 PM
04/05/18 08:58 PM
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There's 3 18's at PArkway with 410's on the spec sheets. Maybe they special ordered them. I'm going 3.73's anyway


Bryan O'
Total Recreation Products Inc.
Commercial Park and Playground Products and Services
totalrecreation.net
Ranger Z520 250ProXS
Re: Duramax Gear Ratio [Re: Bryan O'] #12704935
04/06/18 12:02 AM
04/06/18 12:02 AM
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Troy, Tx.
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I just bought a Duramax it has the 373 gears would not get anything else. Had a 97 with 373 then a 2009 with a 342. The 373 ran circles around the 342 in all as specs.

Re: Duramax Gear Ratio [Re: Bryan O'] #12705055
04/06/18 01:59 AM
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GM doesn’t and has never produced the duramax with anything but 3.73’s. The duramax is an option. 4.1:1 gears will be listed as standard equipment and along with the duramax under optional will be 3.73’s.

Wish one of the gm dealers would respond lol none of them have 4.10’s

Re: Duramax Gear Ratio [Re: Bryan O'] #12705063
04/06/18 02:03 AM
04/06/18 02:03 AM
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As far as I know, when you add the duramax option it switches from 4.10s to 3.73. Only the gas engine comes in 4.10s.



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Re: Duramax Gear Ratio [Re: Bryan O'] #12705264
04/06/18 09:46 AM
04/06/18 09:46 AM
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Larry M Offline
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All you need is 3.73 in any diesel. I had 4.10 in a Power Stroke and mileage sucked my 3.73 Duramax's way out towed and worked the 4.10 Power Stroke plus Top Speed was 82mph and it was rmp'd out.


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Re: Duramax Gear Ratio [Re: Bryan O'] #12705420
04/06/18 01:24 PM
04/06/18 01:24 PM
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Oeste Del Tejas
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Transmissions are little better nowadays with more gears and higher o/d gears. Low axle ratios don't bother me.

Re: Duramax Gear Ratio [Re: Bryan O'] #12709115
04/09/18 02:18 PM
04/09/18 02:18 PM
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huffman tx
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turtdogg Offline
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The ‘18 duramax is one bad motha, and it can pull wayyyy over 82 mph....

Last edited by turtdogg; 04/09/18 02:19 PM.

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Re: Duramax Gear Ratio [Re: Bryan O'] #12709269
04/09/18 03:53 PM
04/09/18 03:53 PM
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Pearland, TX
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dk2429 Offline
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Duramax only used 3.73 as far I as know. Best diesel put in a pickup. Paired up with that Allison transmission, bad son of a gun


Majek 22 Extreme/225 Optimax Pro XS
2006 Chevy 2500HD Silverado/6.6 Duramax LBZ


Re: Duramax Gear Ratio [Re: Bryan O'] #12709886
04/09/18 10:54 PM
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I’ve got a 2018 with the 6.6 duramax, I will NEVER own another gas burner as my main truck, maybe for a 3rd vehicle.


Don't leave a fish to find a fish!!! Mark Zona
For the love of god man, set the hook!!! Me
Re: Duramax Gear Ratio [Re: turtdogg] #12711276
04/11/18 12:14 AM
04/11/18 12:14 AM
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Originally Posted By: turtdogg
I’ve got a 2018 with the 6.6 duramax, I will NEVER own another gas burner as my main truck, maybe for a 3rd vehicle.


x2. I've driven/towed with gassers mostly. Got the Duramax, never again a gasser. Those new L5P's are power houses!

The night and day difference between towing with a gasser and a diesel even with my light of a boat (~4,000) is completely incredible. RV weighs around 6500lbs and I will say, my favorite part about going camping now is hauling that trailer through the hills of East Texas and the hill country. Best part is going up a grade with the cruise on 70, that Allison sticks in 6th gear and you hear that Duramax grunt and groan and chug on along over the hill. Gasser would drop 2 gears and hit 3500RPM.....

Last edited by dk2429; 04/11/18 12:18 AM.

Majek 22 Extreme/225 Optimax Pro XS
2006 Chevy 2500HD Silverado/6.6 Duramax LBZ


Re: Duramax Gear Ratio [Re: Bryan O'] #12712846
04/12/18 02:50 AM
04/12/18 02:50 AM
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redchevy Offline
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D-max ain’t grunting with 6500 lb travel trailer!

Re: Duramax Gear Ratio [Re: redchevy] #12721259
04/18/18 01:32 PM
04/18/18 01:32 PM
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dk2429 Offline
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Originally Posted By: redchevy
D-max ain’t grunting with 6500 lb travel trailer!


By grunting I don't mean struggling lol. I guess another way of saying that is "mean sounding"


Majek 22 Extreme/225 Optimax Pro XS
2006 Chevy 2500HD Silverado/6.6 Duramax LBZ


Re: Duramax Gear Ratio [Re: redchevy] #12721527
04/18/18 04:15 PM
04/18/18 04:15 PM
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Originally Posted By: redchevy
GM doesn’t and has never produced the duramax with anything but 3.73’s. The duramax is an option. 4.1:1 gears will be listed as standard equipment and along with the duramax under optional will be 3.73’s.

Wish one of the gm dealers would respond lol none of them have 4.10’s

You're mostly correct but because of so many option levels, mid year changes, and customer custom ordered espcially on work trucks we don't go by the thinking that this is the only way they come. It's best to know what they have by looking up the vehicle build on our special GM website. When we order parts for vehicles we don't tell the parts guy what gear ratio we need or what color a part is. We tell them what we need like a "ring and pinion" or a "door panel" and give them the last 8 of the VIN. They then look up the parts by that vehicles build sheet and give us the part it was built with.

If you want to know what your vehicle was really built with call your local GM dealer parts department and ask them. They will need the last 8 numbers of your VIN to look it up.

Re: Duramax Gear Ratio [Re: Bryan O'] #12721631
04/18/18 05:46 PM
04/18/18 05:46 PM
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redchevy is correct. Every 2500 or 3500 with a duramax (since 2001) will have 3.73's. In this unique case it is very cut and dry. There were no mid year changes, no custom ordering for a different ratio, nothing other than the buyer changing them after purchase.

The only exception in regards to the Duramax would be the Kodiac (top kick?) medium duty trucks. I believe they were available with 4.56 or were all 4.56 not sure.


Re: Duramax Gear Ratio [Re: Bryan O'] #12721759
04/18/18 07:15 PM
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I pulled up the 8 that where at the dealer the OP said... 3 of them list 4.10 gears and a 6.0 L gas v-8.

Re: Duramax Gear Ratio [Re: Bryan O'] #12722986
04/19/18 07:39 PM
04/19/18 07:39 PM
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You can even get on Chevy's "Build And Price." As soon as you add the Duramax in the truck, it takes away your 4.10's and adds 3.73's.

Wonder why GM doesn't allow 4.10's on the Duramax..?


Majek 22 Extreme/225 Optimax Pro XS
2006 Chevy 2500HD Silverado/6.6 Duramax LBZ


Re: Duramax Gear Ratio [Re: dk2429] #12723088
04/19/18 08:39 PM
04/19/18 08:39 PM
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Originally Posted By: dk2429
You can even get on Chevy's "Build And Price." As soon as you add the Duramax in the truck, it takes away your 4.10's and adds 3.73's.

Wonder why GM doesn't allow 4.10's on the Duramax..?
Because you don't need extra torque. It would just be a useless gas mileage hit.


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Re: Duramax Gear Ratio [Re: Bryan O'] #12747680
05/08/18 05:32 PM
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3.73 = 6.6L Duramax Diesel
4.10 = 6.0L Gas

Re: Duramax Gear Ratio [Re: Bryan O'] #12754750
05/14/18 04:55 PM
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Nice to hear so much positivity on the duramax. Never owned one but always wanted one. i have the 5.3 and was thinking about upgrading to the duramax but constantly hear ppl dogging it. too many powerstroke guys with too many opinions i guess!

Re: Duramax Gear Ratio [Re: TXMako2201] #12755032
05/14/18 07:28 PM
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Originally Posted By: TXMako2201
Nice to hear so much positivity on the duramax. Never owned one but always wanted one. i have the 5.3 and was thinking about upgrading to the duramax but constantly hear ppl dogging it. too many powerstroke guys with too many opinions i guess!


Honestly think you would be hard pressed to go wrong with any of them these days, they are all solid trucks. Ours have always been good. Most people are just brand groupies and don't know much about anything.

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