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Custom Dodge Ram Performance Mods - Engine - 3.6 Liter Pentastar V6 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 3.6-liter V6 engine - 305 horsepower, 265 lb-ft of torque.


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  #1  
Old 03-18-2014, 11:31 AM
MJK MJK is offline
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Hello, I'm new here. I have a 2013 RAM 1500 SXT Quad Cab 4x4. 3.6L, V6, 8 speed automatic.

We're looking to get a travel trailer soon and I'm getting different stories from the trailer dealers on how much I can tow with my truck. One place says 7000lb, another says 5900lb. I feel like they will tell me anything just to get me to buy a trailer.

What can I safely pull as I don't want to spend the money on a trailer that ends up to be too heavy?

PS - I have gotten a transmission cooler installed as well.

If this is in the wrong section, please let me know.

Thanks for any replies.

Mike

Last edited by MJK; 03-18-2014 at 11:49 AM.
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Old 03-18-2014, 11:57 AM
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ljinnc ljinnc is offline
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2013's are 4750lbs, 2014's are in the 7k range due to improved parking pawl.
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Old 03-18-2014, 01:29 PM
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Wow, that is surprising. That's the lowest I've heard yet. Sounds like I'm very limited to my options. Thanks for the reply Ljinnc.
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Old 03-18-2014, 01:49 PM
ksarnecki ksarnecki is offline
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Quote:
Originally Posted by ljinnc View Post
2013's are 4750lbs, 2014's are in the 7k range due to improved parking pawl.
Thats not entirely accurate. The 3.21 geared axel gives you 4150lbs, while the 3.55 axle give you 5850lbs. That is for the Quad Cab 4x4 in the SLT trim which I think is the same as yours. The numbers have been increased for 2014 but I doubt they actually modified the truck at all, probably just using magic towing dust (FLT reference). Heres the PDF from Dodge.
http://www.ramtrucks.com/assets/towi...wing.Specs.pdf
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Old 03-18-2014, 03:04 PM
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Thanks for the PDF. I was trying to find that chart. The 5850lb is what someone else mentioned but then was given higher and lower numbers as well. The chart is what I'll go by. Thanks ksarnecki.

Mike
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Old 03-19-2014, 02:17 PM
PaulBx PaulBx is offline
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Quote:
The 3.21 geared axel gives you 4150lbs, while the 3.55 axle give you 5850lbs.
Can someone please explain this to me? Why the difference in two trucks identical except for the rear end ratio? Is a lower ratio more fragile than a higher one? Or does a lower ratio mean the engine has to work harder - and can't that be compensated for by keeping it out of 8th gear?

I'm also curious what the 2014 numbers are since my truck is a 2014. Thanks for that pdf file by the way.

I'm also curious about why the Hemi payload is higher than the Pentastar, since the latter is over 200 lbs lighter. Usually that would make for a greater payload...
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Old 03-19-2014, 02:49 PM
ksarnecki ksarnecki is offline
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Quote:
Originally Posted by PaulBx View Post
Can someone please explain this to me? Why the difference in two trucks identical except for the rear end ratio? Is a lower ratio more fragile than a higher one? Or does a lower ratio mean the engine has to work harder - and can't that be compensated for by keeping it out of 8th gear?

I'm also curious what the 2014 numbers are since my truck is a 2014. Thanks for that pdf file by the way.

I'm also curious about why the Hemi payload is higher than the Pentastar, since the latter is over 200 lbs lighter. Usually that would make for a greater payload...
The 3.21 (Taller gear) means that the wheels will turn 3.21 times each time the drive shaft turns. The 3.55 (shorter gear) would then turn the tires 3.55 times for each turn of the drive shaft. Its similiar to gears on a bike. The higher the number the greater power and speed you can get out of the bicycle. However the numerically higher the gears use more energy from the engine and therfore can be slightly less effecient on fuel. Attached is a better guide on gears and towing.
http://www.forconstructionpros.com/a...ve-performance

Here is a better towing/payload guide for 2013 and 2014 from the Ram website. http://www.ramtrucks.com/en/towing_guide/tow_chart/

And I think the Hemi has a higher payload due to the greater horsepower and torque. Just easier for the truck to hall and tow more.

Hope this helps.
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Old 03-19-2014, 07:19 PM
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Uh, it seems to me you have it backward. The 3.21 means the driveshaft turns 3.21 times for each turn of the wheel. That is a "taller" gear than 3.55 which requires more turning of the driveshaft for each turn of the wheel. The pinion is on the driveshaft, not the axle.

That's a good link you posted. I understand that with a taller rear end you might have to shift down more going up a hill, and end up at higher rpms. However with an 8-speed maybe this is not so much of a problem any more. Also I understand 1st gear in this gearbox is a real granny so it should be easy to get a load going even with a taller rear end.

On that other link with the towing capacities, switching from the 3.21 to 3.55 makes the tow weight go from 4800 to 7300. I'm still wondering why such a large difference. Seems to me that means I just have to shift the transmission down one more gear than on the 3.55 truck, more or less?

This thread explains a lot:
http://www.ramforumz.com/showthread....tios%22&page=2

Guess I won't worry too much about it, just shift down and go a bit slower, heh.

Last edited by PaulBx; 03-19-2014 at 08:04 PM.
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Old 03-19-2014, 08:07 PM
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Using the TOW/HAUL button also holds a gear for a longer period of time, letting the engine get up more into the Torque band

With the 8 speed, all of the lower gears are closer together, so that you don't need to rev the engine as much to shift into the next higher gear. That also helps to keep the engine closer to the power/torque band, instead of going from say 3,000 rpm down to 1,800 & then back up again to 3,000 during each shift
The older 5 & 6 speeds had quite a bit of gap between the lower gears & the REVs fluctuated quite a bit
All 3 transmissions have the identical Top gear Ratio of .067:1

If you have 3 identical Ram trucks, outfitted the same, seat wise, same radios, same bed size, etc.
all with the 5.7 HEMI, 8 speed transmission, same driver

the only difference being the differential ratios
3.21 axle ratio 0 to 60 times are slower then the 3.55 axle ratio
3.55 times are slower then the 3.92 ratio
3.92 times are slower then the 4.11 ratio
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Old 03-21-2014, 01:22 PM
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Use the GCVWR
The max trailer weight is a BS number.

Make sure the truck loaded is under the GVWR and, with trailer under the GCVWR. Also make sure the trailer is not loaded past its GVWR
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