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RE-GEARING ON A BUDGET

Re: RE-GEARING ON A BUDGET

Postby GAFENCEGUY [OP] » Feb 12 2020, 7:47pm

19trax95 wrote:You have a 17 duramax, lifted on 38s and are debating spending money on a gear swap?

And a gear swap does NOT cost $5k to do lol.

But yes you should do both axles at one time. You can do just the rear but I would not recommend doing so. It makes 4wd useless if you needed it and it's a hack way of doing things.

You have 3.73 now, so I'd assume you are looking more in the 4.88 range correct? You may be able to get away with 4.56 but if your towing a lot then it may still not be ideal.


On the high end your looking at around $1700-1800 in parts. And that's if your replacing all the bearings front and rear. If you arent, which in a 2017 you probably wouldn't need to, that knocks the parts cost down to around $800-1000 depending on what brand gears and seals you go with. Labor shouldn't be more than $1k for front and rear. The rear diff is easy and the front is just the normal GM ifs which is more involved than the rear but not terrible.

So a realistic price for front and rear gears, with labor would be around $2,000. Again depending on parts used and shop labor rates.


Yeah, I thought the same thing about price. Two local shops have given me almost the same price, and one of them is a "friend". Gearing a 2wd would be 1500.00 which still seems high but it's a lot cheaper then 5000.oo.

Looking to go to 4.56 . A friend has 4.88's on 37's and when I test drove with my trailer, it almost seemed too high in the RPM at highway speed. That's another reason for a 2-stage re-gear. If I determine it's not enough, I can go higher without doubling the cost AGAIN.
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Re: RE-GEARING ON A BUDGET

Postby GAFENCEGUY [OP] » Feb 12 2020, 7:53pm

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Re: RE-GEARING ON A BUDGET

Postby GAFENCEGUY [OP] » Feb 12 2020, 8:03pm

19trax95 wrote:They dont need as much gear as gas trucks do, but a 38 is still a big and very heavy tire.

4.10 has been gone from the diesels for a while. I don't even think you could get them at all in the k2xx platform. Maybe even the gmt900. I know some of the gmt800 diesels had 4.10, but I have never seen one newer than that with anything but 3.73.

4.56 may be enough but with frequent towing I'd opt for the lower gears. Most guys running 35-37s go anywhere between 4.30 and 4.56. Then step up to 38-40s and seem to run 4.88-5.13. That's for the ability to tow without putting a huge amount of stress on the trans and motor.


Correct about the 4.10's. the newer 2500 duramax's come with either a 3.73 in 4x4's or 3.42 ratio in 2x4 from what I have read. The 3500's, I believe, can be optioned with a 4.10 rear end from GM.
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Re: RE-GEARING ON A BUDGET

Postby Bradley21sanders » Feb 12 2020, 9:29pm

Nice truck, definitely stay with the current tire size. Looks great!
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Diablew 89 tune--Halo Lifts Coilovers (3") + 1 1/2" Zone Body lift--Rough Country Forged UCAs--Carven TR muffler
4.56 gears/Eaton Truetrac--285/75r17 Falken Wildpeaks--Deaver mini pack
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Re: RE-GEARING ON A BUDGET

Postby GAFENCEGUY [OP] » Mar 28 2020, 7:56pm

Ok, So a little update.

I have completed the re-gearing process and went through with doing both axles at the 4.56 gear ratio. Now my Cruise control is not working. I drove it a couple days to do the heat cycles before installing a Hypertech Speed calibrator. Naturally, aside from correcting the speed on the dash, that did not fix the problem. Does anyone know what needs to be corrected in order to get my cruise control operational again?? I'm guessing it has something to do with the rpm difference between the transmission and the differential speed sensors. Is it as simple as replacing the transmission sensor to match the new gear ratio or will the TCM need to be re-programmed by a shop/dealership.?.?.?.?
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