The Assassin
Senior Member
- Joined
- Jul 8, 2010
- Posts
- 7,725
- Reaction score
- 58
- Location
- B-more careful, Murderland
- Ram Year
- 2006
- Engine
- 4.7
4.56's all the way.
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Not worth it ... IMO . Those gears are just to low for a full size truck . Why they come from the factory is beyond me
If you have that kind of money to spend you have enough to not even think about gas mileage. Who care about MPG when you have thousands to throw into rims,tires & gears?
Opinions on gears...about as varied as the trucks and ther owners themselves.
One thing is constant...the more unsrung weight you add from large tires and the more weight you add to your truck, the more torque you need to get that mass moving.
Gears are torque multipliers, simple as that. They are also horsepower bleeders, thats why you lose top end when you install them.
Its also unfair to compare a cummins truck, which makes around 400 ft/lb of torque to the same wheel base gasser, which makes around half that.
So....rather than give an opinion, I present a handy dandy chart that helps you determine what a gas vehicle should gear to.
Remember...Multiply the given rpm by .85 to get your overdrive rpm at 65 mph.
Tire & Gear Ratio Chart at Morris 4x4 Center
For the OP's application, if you are going to run a 35 inch tire, with a wider heavier rim, you should be running 4:56's You'll be running 2418 rpm in OD at 65. That will hurt your mileage slightly, but no worse than bucking a headwind with a full load and the OD off... with 4:10s.
On the subject of 3:92 gears, one should notice that with 33 inch tires there is only a 132 rpm difference between 3:92s and 4:10s, but 240 rpm between 3:92s and 3:55s! In OD that works out to 1997 and 2200 for the 3:92's 2200 rpm is about the torque curves' sweet spot in a mild magnum V-8.
What would you recommend in my situation?
I rarely pull a trailer, but when I do is a 6x12 (Uhaul) less than 2k lbs wet.
I mainly do city driving with mixed highway.
I want to maintain decent gas mileage (14cty/18hwy)
And once every other month we drive a 500 mile round trip to the in laws.
4.56 rocks in town man it does add a littler to highway RPMS but worth it IMO. It does allow you to tow more as well especially when you have a big load and need to get it moving.
Not actually more but lets you tow heavier things with more ease
keep in mind that towing cap is not just determind by gears but also Brakeing! You can get any truck to move a load with right gears but w/o the right breaks you may be buying someone a new car cause you couldn't stop in time.
I personally use trailer breaks when ever I can and upgrade the brakes as soon as I do the performace. just sayin =)
keep in mind that towing cap is not just determind by gears but also Brakeing! You can get any truck to move a load with right gears but w/o the right breaks you may be buying someone a new car cause you couldn't stop in time.
I personally use trailer breaks when ever I can and upgrade the brakes as soon as I do the performace. just sayin =)
I like Randy's ring and pinion, have contacted them before and they are pretty responsive and friendly.
I am leaning towards the 4.56's, I think they are a good fit for my mostly city driving, off roading, and on the highway I think even though I'd like to go 85 the 4.56's will keep me honest at going 65-70 which means no more tickets for me lol