So I will probably never tow more than about 5,000 pounds and the two main highways I take to my cottage have speed limits of 80 Km/H meaning you set it at 90 and 100Km/H meaning you set it at 119. Which rear end would you say is best for me?
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The best rear axle ratio for me
- Thread starter A4Owner
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GKIII
Ram Guru
If you tow at all I'd recommend the 3.92.
bigdodge
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did you see the thread https://5thgenrams.com/community/th...uide-to-3-21-vs-3-92-axle-ratio.16986/page-88
lots of different opinions you have to do what you feel will work for you
me I like the quick launch and tow about as much as you so the 3.92 was important to me. one reason i went through three orders.
Threesuns1
Ram Guru
What engine are you thinking about?
U
User_3336
Guest
3.92. its only a $95 option. Better to get it up front.
U
User_3336
Guest
Another reason I got the 3.92 was to eliminate the constant gear hunting that a 3.21 axle ratio makes truck do.
My truck pretty much stays in 8th gear all the time. I have a couple of slopes and slight inclines on my everyday commute. In a 3.21, it would be a continual 6-7-8 gear thing. I've even had a harsh downshift from 8th to 5th having to floor it a bit to keep up speed going up the same hills.
3.92 will have a higher RPM at highway speeds, lets say 70mph, about 2,000 RPM.
My truck pretty much stays in 8th gear all the time. I have a couple of slopes and slight inclines on my everyday commute. In a 3.21, it would be a continual 6-7-8 gear thing. I've even had a harsh downshift from 8th to 5th having to floor it a bit to keep up speed going up the same hills.
3.92 will have a higher RPM at highway speeds, lets say 70mph, about 2,000 RPM.
U
User_3336
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Lets NOT!
5.7 liter
Just check your payload on the build tool. A lot of these trucks are stupid heavy when optioned out. If you tow a LOT and carry a lot of gear you will go over payload unless you get a stripper tradesman build.
Idahoktm
Spends too much time on here
I took note last week...3.92 gearing: 70 mph=1700 rpm. 75 mph=1900 rpm. That's with 33" tires.
deeve
Ram Guru
Not trying to be a wise guy but what would you consider stupid heavy with low payload? Like what is considered low?
Idahoktm
Spends too much time on here
All 5.7's have MDS.
What Is Hemi MDS?
We explain how Chrysler Hemi MDS cylinder deactivation works, what goes wrong, and how to fix it when it breaks.
U
User_3336
Guest
I turn that stupid crap off every time I get in my truck. My "-" button is pressed everytime I get on the highway.All 5.7's have MDS.
What Is Hemi MDS?
We explain how Chrysler Hemi MDS cylinder deactivation works, what goes wrong, and how to fix it when it breaks.www.motortrend.com
bigdodge
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and after reading that article I am going to have to teach the wife how to use the "-" button.
Mountain Whiskey
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Truck=3.92
Girly Grocery Getter= 3.21
You can decide what is best for you.
Girly Grocery Getter= 3.21
You can decide what is best for you.
Hahaha...because a black 1500 is so girly lol. Anyways I figure a 3:21 with MDS on mid grade fuel shouldn't be that bad on the highway. Should it?
GKIII
Ram Guru
My suggestion when you're buying a $50k+ V8 truck is not to worry about MPGs and get something that suits your needs the best. So to reiterate what I said above, if you tow at all you'll be much happier with the 3.92.
MDS is usually never on unless you are going below 60 mph without a trailer anyway.
Thanks for including that article. It explains why I didn't see any noticeable difference in fuel economy when I tested out MDS on and MDS off on my last truck. And makes me feel better about keeping it off on my current truck.All 5.7's have MDS.
What Is Hemi MDS?
We explain how Chrysler Hemi MDS cylinder deactivation works, what goes wrong, and how to fix it when it breaks.
Which describes how I use my truck more than 90% of the time
