2012 rear end gear swap question - Dodge Cummins Diesel Forum
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post #1 of 14 (permalink) Old 07-07-2014, 02:12 AM Thread Starter
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2012 rear end gear swap question

I'm considering swapping the 3.73 gears to 4.10 for towing. (yes I know I have to swap the front axle gears too)

my question is, its just the ring and pinion gear sets that need to be changed, right? the 3.73 and 4.10 fit inside the same axle, correct?

I put down a deposit on a new toy hauler fifth wheel with an empty weight of almost 15,000lbs. Once its loaded with crap it will likely be close to 17,300-17,500. Seems like most guys towing heavy are running the 4.10 gears.

I've towed 11,000lbs with the 3.73 and it just fine, just wondering if its going to be worth changing to 4.10 gears due to the extra weight of the trailer.

Thanks for any input


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post #2 of 14 (permalink) Old 07-07-2014, 05:02 AM
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Yes, it's just the ring and pinion that have to change. There are some bearings and crush sleeves and things of that nature that need to be changed in order to change the ring and pinion.

I bought my gears from George at 8 Lug Truck Gear. He also sells some install kits that come with all the other stuff needed.


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post #3 of 14 (permalink) Old 07-07-2014, 06:58 AM Thread Starter
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Thanks. I may wait to tow the new fifth wheel with the 3.73s and then decide if I need to jump to 4.10s. I'll look at 8 Lug's website for pricing

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post #4 of 14 (permalink) Old 07-07-2014, 07:08 AM
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Lots of opinions on this. I am a 4.10 fan. My sold truck had them, and so does my sig truck. Our 5er is 15,000lbs. loaded. If your new 5er comes in at almost 15,000lbs. empty, IMO, you will be wise getting the 4.10 rear. Towing up a 6% grade, towing our 5er, I can maintain 60 mph. I have seen low of 7.4 mpg. towing in strong winds, and a high of 11.5 mpg. in more ideal conditions. I like to stay in the 62-65 mph. range. I sure the 3.73's will do ok, but I do think you would be really pleased with the 4.10's. Best wishes, enjoy your new 5er, and happy travels.

edit: On a steep grade, I lock out 6th, and stay in 5th gear.

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post #5 of 14 (permalink) Old 07-07-2014, 12:49 PM
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Yes, for Towing I don't think you can beat 4:10's. I have had trucks with 3:73's towing 14,000 lb. fifth wheels and it was constantly gear searching. You wouldn't think 4:10's would make that much of a difference but they do!!! It keeps the RPM's where the cummins best torque range is.

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post #6 of 14 (permalink) Old 07-08-2014, 11:38 AM
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Quote:
Originally Posted by diverb View Post
I'm considering swapping the 3.73 gears to 4.10 for towing. (yes I know I have to swap the front axle gears too)

my question is, its just the ring and pinion gear sets that need to be changed, right? the 3.73 and 4.10 fit inside the same axle, correct?

I put down a deposit on a new toy hauler fifth wheel with an empty weight of almost 15,000lbs. Once its loaded with crap it will likely be close to 17,300-17,500. Seems like most guys towing heavy are running the 4.10 gears.

I've towed 11,000lbs with the 3.73 and it just fine, just wondering if its going to be worth changing to 4.10 gears due to the extra weight of the trailer.

Thanks for any input
I also tow a 15k dry 5th wheel with a 12ft garage for toys. Gotta be 18k+ loaded. I went for th 4.10 gears cause with 3.73 your tow rating is reduced by almost 8k per ram towing chart. My guess is the higher 3.73 gears are harder on the tranny, so they derate it.

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post #7 of 14 (permalink) Old 07-08-2014, 11:45 AM
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Originally Posted by rspecwhite View Post
I also tow a 15k dry 5th wheel with a 12ft garage for toys. Gotta be 18k+ loaded. I went for th 4.10 gears cause with 3.73 your tow rating is reduced by almost 8k per ram towing chart. My guess is the higher 3.73 gears are harder on the tranny, so they derate it.
I thought the de-rated trucks had the manual transmission?

2012 SLT 3500, CCLB, HO, SRW 4x2, 4.10s, 68RFE, Mineral Grey, Pacbrake air springs, Fumoto oil valve, Cat/Cummins Dual Filter kit, Edge CTS Monitor.
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post #8 of 14 (permalink) Old 07-08-2014, 05:12 PM Thread Starter
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I checked 8lugtruck gear and I was pleasantly surprised, the gears front & rear were not as expensive as I thought. Having never done a rear gear change, I will pay a rear end / axle shop to do the install. I wonder many hours labor that will be?

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post #9 of 14 (permalink) Old 07-08-2014, 05:28 PM
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I have the 4.10 gears as I ordered my truck. My reasoning was 35s put me closer to 3.73 ratio. The biggest load I typically haul is a Jeep on a car trailer so maybe 7K. I hadn't tried the lockout 6th before but I will later this month on the way to the Rubicon!

2012 Laramie Megacab SRW, all options minus DVD, AMP steps, WeatherTech Mats, 35" Trail Graps, 4.10s, 5K Retro Solutions HIDs, H&S MM/OD, EGR delete, ARP 425.
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post #10 of 14 (permalink) Old 07-08-2014, 11:40 PM
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Quote:
Originally Posted by diverb View Post
I checked 8lugtruck gear and I was pleasantly surprised, the gears front & rear were not as expensive as I thought. Having never done a rear gear change, I will pay a rear end / axle shop to do the install. I wonder many hours labor that will be?

The shop I used charged me $1300 to do front and rear. Since my truck had relatively low miles on it, they bought my old gears from me for a couple hundred bucks. A good deal for them, but I had no use for them.


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post #11 of 14 (permalink) Old 07-10-2014, 09:18 AM Thread Starter
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Quote:
Originally Posted by Hoss TX View Post
The shop I used charged me $1300 to do front and rear. Since my truck had relatively low miles on it, they bought my old gears from me for a couple hundred bucks. A good deal for them, but I had no use for them.
Was that $1300 parts and labor or labor only ?

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post #12 of 14 (permalink) Old 07-11-2014, 11:24 AM
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pro trac gear in edmonton charged me 900 for the install, 3.73 to 4.56, and 1249 for gears and install kits, gst in, running 38's and wow, what a difference, gearing is back to stock for rpm's

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