3:73 or 4:10

[mpaulson]

Here's a link to a web site where you can download an excel spread sheet with all the trannys and gear ratios on it with the speeds.



http://www.klenger.net/dodge/general-reference/gear-speed-calculator.xls

 

[NIsaacs]

Thanks for the information. It was just a little more than I was looking for. I just want a simple 2500 Ram. So lets keep it simple. Rule 1: Nothing above Ram 3500. Have a nice day.

Hummm, not to be disrespectful, but this is not your thread... .



It is not uncommon for a thread to get off track, some of us get carried away with our truck stories due to our broad interest.



Nick

 

[mwilson]

Hummm, not to be disrespectful, but this is not your thread... .



It is not uncommon for a thread to get off track, some of us get carried away with our truck stories due to our broad interest.



Nick

And use our truck stories to help make a point.



In plain english get the 4. 10 if you are going to tow much weight.



Motor is in the torque band less, thus less heat and stress transmitted to the driven units behind it.



Many diesel engine characteristics cover a broad range of wheeled and tracked vehicles, so can be used for examples on these Dodge units.



I'm just sayin... .....



Mike.

 

[mwilson]

Here's a link to a web site where you can download an excel spread sheet with all the trannys and gear ratios on it with the speeds.



http://www.klenger.net/dodge/general-reference/gear-speed-calculator.xls

Nice spreadsheet!!!!!



Thank you.



Mike.

 

[AH64ID]

Thanks for the information. It was just a little more than I was looking for. I just want a simple 2500 Ram. So lets keep it simple. Rule 1: Nothing above Ram 3500. Have a nice day.

You are not the OP for this thread, your questions are not about this topic and should be in a new one.



So about them rules?

 

[Barbieri]

Thanks for the Chart. I assume the white boxes represent the number of revolution per gear at the stated RPM? I know what your going to say but please bear with me. In the 4:10 ration I see gear 1 at 1000 rpm and a 7 in the square. And that is the number of RPM of the Diff???? Have a nice day. I will save the chart.

 

[mpaulson]

The 7 would be the mph with the engine running at 1000rpm in first gear. The way that I use this chart to compare is I look for lets say 71 mph on the 3. 73 chart in sixth gear an note the rpm's, then look for 71 mph(or the closest mph) on the 4. 10 chart and the same gear and see what the rpms are. This gives you how many rpm's difference there would be between the two rear end gear ratios. You can also type in 3. 42(or any other ratio) in the box that has the gear ratio in it and the rest of the chart will automatically change all the speeds per given gear. If you have different tires than the stock size, you can also change that figure. You would run about 200 rpm higher with the 4. 10 compared to the 3. 73 for example.

 

[Barbieri]

Thanks. I just wasn't sure. Now I understand. I just love Canada. Always go back. Last trip was to PEI. Have a nice day.

 

[Barbieri]

So why am I being notified about answers to my thread. And you appear in my e-mail box.

 

[CKaza]

got a 2011 ram 3500 srw very limited towing it's getting 16mpg I beleive it has 373 gears.

 

[AH64ID]

So why am I being notified about answers to my thread. And you appear in my e-mail box.

Because you subscribed to the thread, but you didn't start the thread so it's not yours. The email says "has just replied to a thread you have subscribed to". . All that means is the server notifies you of new updates.



If you want to make your own thread you need to go to the forum that is appropriate for the topic and press the "new thread" button.

 

[Cummins12V98]

With 3:42 and 6 sp auto at 60 mph in 5th gear what are the rpm's?

Thanks

 

[RustyJC]

With 3:42 and 6 sp auto at 60 mph in 5th gear what are the rpm's?



Thanks

With 31. 8" tires (3500 dually), 1770 RPM





Rusty

 

[AH64ID]

With 3:42 and 6 sp auto at 60 mph in 5th gear what are the rpm's?



Thanks

SRW with 265's would be about 1825, DRW with 235's would be about 1800.

 

[Cummins12V98]

Thanks guys!

 

[martion007]

So far I am at 71,200 on my 2011. Always towing Rvs, sometimes 36ft 5th wheels. I am very satisfyed with my 3:73 rears, I would not be happy with 4:10 rears. Remember half is towing and half returning empty for me. I am quiet sure I get better fuel milage with the 3:73s. Maybe it has something to do with personal preferance.

#ad




2011 SLT diesel 2wd duelly, 68RFE, 373 rears

Full DPF deletes with H&S Performance mini-max chip

firestone airbags/ on the fly adjust

woodhouse dodge sleeper berth

110 gallon extra aluminum fuel tank

RV hauler

 

[AH64ID]

With modern HPCR engines I don't believe higher gears means higher fuel economy. It doesn't matter what gears you have it takes "x" tq to go 70 mph. If you have 3. 73's your engine has to make 10% more tq to get that "x" tq to the wheels to maintain speed than a truck with 4. 10's. So in order to see better fuel economy from lower rpms the 10% difference in rpms has to be able to make more power with less fuel. This may have made a difference on older engines, but modern ones don't care nearly as much about rpms.

 

[martion007]

Coming home empty I am sure I get better fuel economy. End of story. I'm not going to argue.

 

[JJPage]

So far I am at 71,200 on my 2011. Always towing Rvs, sometimes 36ft 5th wheels. I am very satisfyed with my 3:73 rears, I would not be happy with 4:10 rears. Remember half is towing and half returning empty for me. I am quiet sure I get better fuel milage with the 3:73s. Maybe it has something to do with personal preferance.

#ad




2011 SLT diesel 2wd duelly, 68RFE, 373 rears

Full DPF deletes with H&S Performance mini-max chip

firestone airbags/ on the fly adjust

woodhouse dodge sleeper berth

110 gallon extra aluminum fuel tank

RV hauler

That's a very nice looking truck you got there!

 

[AH64ID]

Coming home empty I am sure I get better fuel economy. End of story. I'm not going to argue.

I wasn't trying to argue, just calling it as I see it in general. Just like fear of low fuel pressure carried over from the VP44 to the CP3, mileage vs rpm stories make their way thru the generations.



My dad's 06 and my 05 both have 3. 73's. He has a G56 and I have an NV5600, the OD ratio of the G56 has the same final drive ratio as my NV5600 would have if I had 4. 10's. Our mileage is nearly the same for the same conditions, sometimes his would be better and sometimes mine. He can tow a lot better in OD than I can from the increased torque to the wheels, and also does a bit better on fuel when towing.



My next truck will have the lowest gears offered, from what I can tell the mileage will be better when towing and the same (if not better) when not towing.



I did some math on the subject based on arbitrary numbers.



Lets say you are need 1000 ft/lbs of tq to the wheels to keep your load moving. Let's also assume were in direct gear (5th manual, 4th auto) for simplicity reasons. Speed is 55 mph, tires are 235/80/17.



3. 42's would be at 2035 rpms making 293 ft/lbs

3. 73's would be at 2220 rpms making 268 ft/lbs

4. 10's would be at 2440 rpms making 244 ft/lbs.



This shows that the tq required from the motor is lower as the gearing goes up. So for the higher gears to be more efficient you have to be able to make that increased torque with less fuel, and I just don't see these modern motors have that large of a BSFC curve over that 400 rpm difference.



Just my . 02, not really directed at anyone in particular just in line with the topic at hand.

That's a very nice looking truck you got there!

I agree!