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Old 11-12-2018, 05:01 AM   #41
Javi
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Personally with most of today's auto transmission gear ratios/over drive the 4:10 has become pretty much unnecessary unless towing heavy (14K and up) full time.. My older Ram with the 5.9 two valve and the 5 speed manual needed 4:10's to untrack itself with 14K

My current dually with the 6.7 Ford and 3:73 ratio is plenty for anything less than heavy daily towing...
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Old 11-12-2018, 09:33 AM   #42
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Duramax with 6 speed Allison in tow/haul mode with exhaust brake enabled mated to 3.73 rear end will tow 16.5k 5er ALL day long at 65-68 mph/1700 rpm with cruise set up or downhill getting 10 mpg & never breathe hard.
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Old 11-12-2018, 12:58 PM   #43
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Axle Ratio

I have a 2009 Ram 3500 Megacab dually 6.7L with a 3.73 rear end. I pull a 17000lb. Montana 3810MS and am very happy with the way it handles it.
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Old 11-12-2018, 01:12 PM   #44
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I have a 2009 Ram 3500 Megacab dually 6.7L with a 3.73 rear end. I pull a 17000lb. Montana 3810MS and am very happy with the way it handles it.
Yes but you are in Saskatchewan. I think a 1/2 ton would handle that puppy.
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Old 11-13-2018, 12:36 PM   #45
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Another vote for upgrades being a money pit. If you can manage it, a newer vehicle will bring a lot of the upgrades you are looking for and many you aren't as well (quality of life stuff). A quick check on Carmax shows a lot of 3500 Diesel Rams around the country with very low mileage (for a Diesel and what it is made for). There are of course other brands too but since we were talking about a Ram, figured I would stick to that.
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Old 12-05-2018, 03:15 PM   #46
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On a later model Ram dually with the 6.7 the towing difference between 3.73s and 4.10s without the Aisin and HO motor is about 3000lbs, with the Aisin and HO motor there is a 6000lb difference so there is obviously more than just gear ratio involved. I had to look at the dually as those ratios aren't available on the SRW. The OP has an older 5.9 so I'm guessing the difference would be a lot less. Plus the auto trans in those models is a weak link also. Personally, I'd maybe look for a later model Ram with the bigger motor though I realize that may not be an option.
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Old 12-05-2018, 04:46 PM   #47
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H3 has 4.56 gears 4 to 1 low granny gear but a 5 cyl 4500 lbs tow
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Old 12-05-2018, 06:09 PM   #48
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H3 has 4.56 gears 4 to 1 low granny gear but a 5 cyl 4500 lbs tow

442- Had a 2006 H3 with the 5 cylinder until 2010. They had great ratios for 4 wheeling but just didn't have enough power to get down the hiway at any speed, much less tow anything more. Ran the H3 from NV, AZ, TX, NM, CO, OK, WY, LA, GA, MS, GA, FL, NC, SC and more. I loved that H3 for off roading; I've not had a regular size SUV that could actually go over Elwood Pass without using some sort of traction lock or 4 low; the H3 did the whole thing and I never pulled it out of 4 Hi....I was impressed. Anyway, the H3 was a great off road vehicle to me but I just could never think of strapping anything of any size behind it....JMO YMMV.
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Old 12-05-2018, 08:22 PM   #49
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That's why I have a light weight camper,3200 dry 4000 max heavy.
Except for the long hills were it wants to go to 2nd gear at 60 mph I just slow it down to 50 maybe 45 for the steep long hills.
The hills in ny are not a problem 50 to 55
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Old 12-06-2018, 06:51 AM   #50
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Originally Posted by Javi View Post
Personally with most of today's auto transmission gear ratios/over drive the 4:10 has become pretty much unnecessary unless towing heavy (14K and up) full time.. My older Ram with the 5.9 two valve and the 5 speed manual needed 4:10's to untrack itself with 14K

My current dually with the 6.7 Ford and 3:73 ratio is plenty for anything less than heavy daily towing...
I'm curious. You said "older RAM" and then you said it needed 4:10 to untrack itself.

First, what year was your older RAM, and second, what did you mean "untrack itself"?
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Old 12-06-2018, 07:25 AM   #51
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Totally agree that the transmission is the weak link in my truck. But, my 5.9 Cummins has a lot of latitude in it to get more power out of it with upgrades.

With the transmission, does anyone know if the Aisin transmission can be bolted to the 5.9 Cummins? If so, then I could swap out to an Aisin and then mod my engine to get the power I need.

The whole reason for asking about the differential was to determine if that would be the best place to cheaply get more torque for towing. If not, then I should concentrate instead on the engine and tranny.

And, BTW, the specs for my engine are about 300hp and 500 lb/ft of torque.
The swap should be the whole truck for a 2013 or newer 3500 SRW with Aisin. Spending big bucks on a 2003 is not the best plan.

Our 2001.5 with 4.10's towed well. The choice then was 3.54 or 4.10. Your 3.73 are a compromise between the two. If you had 3.54's then you would see a pretty good change, however with 3.73's, the change would not be worth the cost. It would cost north of 10k to put a Aisin in, and i am not sure anyone has worked out now to shift it.

We love our 2015 3500 SRW Aisin setup. Tow a 16K 39.5' 5er. Chris
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Old 12-06-2018, 08:37 AM   #52
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I'm curious. You said "older RAM" and then you said it needed 4:10 to untrack itself.

First, what year was your older RAM, and second, what did you mean "untrack itself"?
'94

Untrack... getting 14K up to highway speeds quickly enough to avoid traffic accidents when entering two lane roads..
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