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Topic: Dodge Ram 3500 Gear Ratio Question?

Posted By: FF1063 on 02/14/11 06:47pm

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* This post was edited 04/22/11 03:28pm by FF1063 *


Posted By: surveyorjp on 02/14/11 06:56pm

Your Ram came with a choice of 3.55 or 4.10 ratio. I don't believe 3.73 was available back then.


2012 Dodge Grand Caravan. Popup shopping


Posted By: RRUGG on 02/14/11 07:01pm

We towed with a Dodge/Cummins 5.9 with a 4 speed automatic and 3.55 axle. We now have a Dodge/Cummins 6.7 with a 6 speed automatic and a 3.73 axle. Our non towing mpg is lower with the newer truck but the towing mpg is the same or better, and that surprised me. I'd go with the 3.73 and, yes, carrying weight is different than towing weight. Carrying, you're more likely to exceed the truck'd cargo capacity. With a 3500 you're not so likely to exceed cargo capacity unless you have or get a large TC with one or more slides.


RRUGG
2009 Chevrolet Silverado LTZ 1500 4x4 5.3L
2011 Kodiak 281RLGS travel trailer
2011 Egg Camper
2010 Chrysler Town & Country
Good Sam life members
Bob & Grace professional retirees


Camped in 49 states. Missing Hawaii.


Posted By: donn0128 on 02/14/11 08:22pm

New truck? What kind of weight do you tow???
My 6.7L dually came with the 4.10 rear end. I tow my 13,350 pound fiver up and down the mountains with ease. I can run all day with the cruise control set at whatever speed I choose and it will pull like there is no tomorrow. Would the 3.73 rear end give me better empty mileage? Maybe. Would it be different towing? Probably. I guess at the end of the day if I was towing max 10-11K I would have gotten the 3.73. Towing what I have I am more than pleased with the 4.10.


Don,Lorri,Max (The Rescue Flat Coat Retriever?)
The Other Dallas



Posted By: ib516 on 02/14/11 08:33pm

The new 6 speed auto has a higher overdrive ratio than the older trucks, so even with the 3.73, the newer trucks (2007.5+) turn less RPM than my 2007 does with the 4 speed auto and 3.73s.

I'd suggest going with the 3.73s as the 3.42 was a measure thrown in to slightly increase mpg and it also really lowers the max tow rating. I think it is like 2 or 3 thousand pounds lower than the same truck with 3.73s.


2010 Cougar 322QBS 5er
Prev:
01 Dodge 2500 360 gas, 4.10
02 Dodge 2500 5.9L Cummins, 3.55
07 Dodge 3500 SRW Mega 5.9L Cummins, 3.73
Current:
2014 RAM 2500, 6.4L Hemi, 4.10, auto

10000# GVWR, 5500# FGAWR, 6500# RGAWR, 3040# payload, 15470# tow rating, 22500# GCWR



Posted By: SoCalDesertRider on 02/14/11 09:21pm

If you're worried about loss of fuel mileage from running a lower axle ratio, drive a little slower and you will get the mileage back.


05E350 6.0PSD
97F350DRW 7.3PSD 4x4 4.10 11' flatbed
98Ranger
69Bronco ATC250R CR500
20' BigTex flatbed carhauler
Callen Camper

92F350 CrewCab 4x4 351/C6
B&W TurnoverBall, Curt Magnum V
HD Springs Bilsteins,
285/75-16E BFG AT on 16x8 Stocktons
4.56's & LockRite rear


Posted By: jmtandem on 02/15/11 08:26am

If it was me I would opt for the 3.73. I have the 3.73 in my Dodge and it is more than adequate. If I was towing an 18,000 pound toyhauler or something very heavy then the 4.10's would be better.


'05 Dodge Cummins 4x4 dually 3500 white quadcab auto long bed.
'09 299bhs Tango.


Posted By: JFG on 02/15/11 08:28am

5000 lb TC... that's pushing the Cargo Carrying Capacity

See below link..

Dodge


Fred



Posted By: 96Brigadier on 02/15/11 09:11am

ib516 wrote:

The new 6 speed auto has a higher overdrive ratio than the older trucks, so even with the 3.73, the newer trucks (2007.5+) turn less RPM than my 2007 does with the 4 speed auto and 3.73s.

I'd suggest going with the 3.73s as the 3.42 was a measure thrown in to slightly increase mpg and it also really lowers the max tow rating. I think it is like 2 or 3 thousand pounds lower than the same truck with 3.73s.


I had a 2009 Ram 3500 CTD with the 3.42 gear ratio. Unfortunately that's the reason I'm now in a 2010 Ram 3500 CTD, the GCWR is 4,000lbs less with the 3.42 versus the 3.73. Basically with a 3.42 gear ratio you're limited to a trailer in the neighborhood of 9,000 lbs (truck weighs 8,000 lbs, GCWR with 3.42 is 17,000 lbs). Ridiculous to put a 3.42 in a one ton truck when that's what it does to your towing capacity. So, now I'm in a 2010 with 3.73 gears and have a 21,000 lb GCWR and can tow my 11,000 lb fifth wheel.

So, even if you have a truck camper and not a trailer, I'd definitely go for the 3.73 to ensure you aren't doing what I did (getting yet another new truck) if you decide to get a bigger trailer.


2010 Dodge Ram 3500 4x4 Megacab Laramie, 6.7L CTD
Truck weight 8,448 lbs with hitch, wife, two kids, full load of diesel
2010 Keystone Cougar 293SAB
Pin Weight 1,800 lb, Trailer Weight 10,300 lb
(Loaded for camping w/ full water tank)



Posted By: coolbreeze01 on 02/15/11 09:34am

If I was going to buy a 2011 3500 Ram, I would go 4.10. I have 3.73 now and its fine where I can drive 70+. When the speed limit is 55 and under, I often use 5th gear.
Those factory Alcoa rims sure look nice on the new duals.


2008 Dodge 3500 With a Really Strong Tractor Motor...........
LB, SRW, 4X4, 6-Speed Auto, 3.73, Prodigy P3, Blue Ox Sway Pro........
2014 Sandsport 26FBSL


Posted By: GBuilders on 02/15/11 10:01am

what RPM's are you running at 75 mph with 4.10 gears?


2007.5 Dodge Megacab DRW 4x4 6.7 w/6 speed auto, 3:73 & prodigy BC
2005 Jayco Eagle 305 BHS



Posted By: 96Brigadier on 02/15/11 10:15am

coolbreeze01 wrote:

If I was going to buy a 2011 3500 Ram, I would go 4.10. I have 3.73 now and its fine where I can drive 70+. When the speed limit is 55 and under, I often use 5th gear.
Those factory Alcoa rims sure look nice on the new duals.


Correct me if I'm wrong but you have a small trailer behind that one ton. Looks like the Komfort 212 only comes in at a little over 4,000 lbs dry. If that's all you are pulling the 4.10 is way over kill, as is the 3.73, unless you are going to upgrade in the future. If you're only in 5th gear at 55 I have to think that's because the engine is lugging, it doesn't need to work at all to pull something that light.


Posted By: coolbreeze01 on 02/15/11 11:00am

96Brigadier wrote:

coolbreeze01 wrote:

If I was going to buy a 2011 3500 Ram, I would go 4.10. I have 3.73 now and its fine where I can drive 70+. When the speed limit is 55 and under, I often use 5th gear.
Those factory Alcoa rims sure look nice on the new duals.


Correct me if I'm wrong but you have a small trailer behind that one ton. Looks like the Komfort 212 only comes in at a little over 4,000 lbs dry. If that's all you are pulling the 4.10 is way over kill, as is the 3.73, unless you are going to upgrade in the future. If you're only in 5th gear at 55 I have to think that's because the engine is lugging, it doesn't need to work at all to pull something that light.


Right, I don't let it lug and I could get by with less truck but I drive mostly up and down mountains steep enough to work the truck with my little TT, 700# quad, and gear.


Posted By: 96Brigadier on 02/15/11 12:22pm

coolbreeze01 wrote:

96Brigadier wrote:

coolbreeze01 wrote:

If I was going to buy a 2011 3500 Ram, I would go 4.10. I have 3.73 now and its fine where I can drive 70+. When the speed limit is 55 and under, I often use 5th gear.
Those factory Alcoa rims sure look nice on the new duals.


Correct me if I'm wrong but you have a small trailer behind that one ton. Looks like the Komfort 212 only comes in at a little over 4,000 lbs dry. If that's all you are pulling the 4.10 is way over kill, as is the 3.73, unless you are going to upgrade in the future. If you're only in 5th gear at 55 I have to think that's because the engine is lugging, it doesn't need to work at all to pull something that light.


Right, I don't let it lug and I could get by with less truck but I drive mostly up and down mountains steep enough to work the truck with my little TT, 700# quad, and gear.


I would never suggest you have too much truck, before we bought our 5th wheel we didn't have a trailer much bigger than yours, for much the same reason you said (driving in mountains, Rocky Mountains in my case). You can never have too much truck

But, in my opinion traveling in 5th so it isn't lugging isn't a reason to get 4.10 gears, nor do I think it would actually change anything for you, you'd still need to be in 5th at that speed and with that kind of weight behind you. Besides, there is nothing wrong with driving in 5th gear. I downshift my truck into 5th when I am unloaded fairly regularly.


Posted By: coolbreeze01 on 02/15/11 12:59pm

Forgot to mention, thinking about taller tires when the time comes


Posted By: jmtandem on 02/16/11 08:35am

When you go to sell it the 3.4 gears will not help. Most buy one ton trucks to tow heavy and the 3.73 or 4.10 gears are part and parcel of that towing need. I echo the above that you cannot have too much truck.


Posted By: 2BLAZERS on 02/16/11 09:34am

FF1063 wrote:

I currently have 3.55's on a 98 Dodge 3500 180HP/420TQ CTD. I always felt I should have ordered it with 3.73 ? Hard to maintain speed in the mountains with GVW at about 12K with a 5K lb truck camper.

The new Dodge's come standard with 3.42's, but available with 3.73, and 4.10.

As I'm unloaded 90% of the time, and with much higher power levels I'm thinking the 3.42 would be fine ? But I'm thinking I should just go 3.73. I really have no idea on this one. Is the difference that noticable while hauling, mpg's ? Is carrying weight actually different than towing the same amount ? Thanks


Okay I have a 5.9 Cummins powered 2005 Dodge 3500 Dually with 3.73. Tows great up to the 14k loaded trailers I have.

I ordered and recieved a 6.7 Cummins powered 2011 Dodge (Ram) 3500 Dually with the 4.10. Tows better the same trailers.

Both trucks at 2000rpm it is about 72/73 miles per hour. 6speed auto vrs 4 speed auto. I am glad I went with the 4.10 on my new truck. 4k camper plus hauling enclosed trailer full of ATVs/RZRs. The new truck certainly hauls the same stuff much better up hills and on the highway and around town. In all my shopping I only saw 3.73 (90%) and 4.10 (about 10%). I wanted the 4.10 so ended up ordering my truck just the way I wanted it.


Posted By: mowermech on 02/16/11 10:37am

FF1063 wrote:

I currently have 3.55's on a 98 Dodge 3500 180HP/420TQ CTD. I always felt I should have ordered it with 3.73 ? Hard to maintain speed in the mountains with GVW at about 12K with a 5K lb truck camper.

The new Dodge's come standard with 3.42's, but available with 3.73, and 4.10.

As I'm unloaded 90% of the time, and with much higher power levels I'm thinking the 3.42 would be fine ? But I'm thinking I should just go 3.73. I really have no idea on this one. Is the difference that noticable while hauling, mpg's ? Is carrying weight actually different than towing the same amount ? Thanks


IF your truck is a dually,
and
IF the axle will fit my '94,
and IF you get to Montana this summer,
stop by the mini-farm, and we will park the two trucks side by side, jack them up, get busy, and you can go home with a 4.10 axle.
I would LOVE to have a 3.55!
I got 11 to 12 MPG towing a 32 foot 5er at a GCW of 21,180 lbs.


CM1, USN (RET)
2002 Fleetwood Southwind 32V, Ford V10
Toad 1: '06 PT Cruiser, Kar Kaddy dolly
Toy (and Toad 2): 2001 Dodge QC SWB, 360 Magnum, Auto, 4X4
"When seconds count, help is only minutes away!"


Posted By: SWMO on 02/16/11 03:14pm

I have a 3.73 in my truck and the only disadvantage seems to be the arbitrary reduction in GCVW. The diesels have so much power it's not a case of pulling power, but protecting the transmission by not putting to much on it.
I do watch my tranny in the hills to avoid to much shifting, but with two overdrive gears I only need to drop one to increase my overall ratio if necessary.
I think the 3.73 is a good compromise for a truck that's going to pull some weight at times.


2009 Dodge 3500 Laramie, DRW, 4X4, auto, 6.7L, B & W Companion.
Jayco Designer 34RLQS, Mor/Ryde



Posted By: FF1063 on 02/16/11 06:05pm

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* This post was edited 04/22/11 03:29pm by FF1063 *


Posted By: jmtandem on 02/16/11 07:07pm

Quote:

I see the diff between 3.42 and 3.73 is about 10%. I wonder if that would mean 10% better mpg for empty hwy daily driving w/ the 3.42 ? Any comments on real differences in mpg ?



I would not count on a 10 percent mileage improvement with the 3.42 gears. Even if every other variable was the same between the two gear ratios (weather, wind, road surface, load, drivers, etc.) the slower turning engine is not necessarily getting better mileage and, in some cases, can be getting worse. Sometimes a faster turning engine actually has less load on the entgine with each revolution than a slower turning engine working harder to do the same work with each revolution at the same speed and similar conditions.


Posted By: ib516 on 02/17/11 07:40am

FF1063 wrote:

Thank you for all the advice, I'm about convinced it will be 3.73's on my next truck.

I see the diff between 3.42 and 3.73 is about 10%. I wonder if that would mean 10% better mpg for empty hwy daily driving w/ the 3.42 ? Any comments on real differences in mpg ?

HERE YOU GO


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