The high expectation is in wanting to get 25 mpg with a "pick up" and still be able to work with it. I had a 3/4 ton dodge with a slant six 4-speed and 456 gears that was a great truck but it topped out at 75 MPH and rode like a truck so it would suck by today's standards. We want multi-purpose vehicles that do most things well but the priority seems to be on comfort and drivability. At the end of the day the pulling power is controlled by many things including tire height, rear gears, transmission ratios and of course low RPM engine torque. Does anyone remember putting a lift kit and monster tires on a 4 cylinder mini truck and wondering where the power and economy went?

 

I appreciate the responses.
But no matter how you look at it, there's no need for a vehicle, especially one with a tow rating of 7000lbs, to go 65 in first gear. That's just dumb.

 

65 in first gear is impossible.


3.92 gears
3.00 1st gear ratio
32.2" tall stock tires



6000 RPM = 49MPH
8000 RPM = 65MPH


SO are you saying that somehow you are reving a 4.7L to 8000 RPM??


Use the second calculator on this page and then come back with a more believable story

http://www.ringpinion.com/Calculators/Calc_RPM.aspx

 

My stock tires are 285/75/17. I know that's very uncommon but it was a factory option.
I suppose it may not be all the way to 65 since I haven't really redlined it to see exactly. Especially since no redline is listed on the tach, (which I really dislike)

 

OK fine, so you are spinning 7599 RPM at 65, which is almost 1600RPM past when the rev limiter kicks in

 

I would check at any dealership what gear ratio you have, call them give them your vin number, I think it's the last 7 numbers gives them that information. 1st gear 60 mph???

could you have a 3:21 axle. anyway call the parts dept. give them the numbers they will tell

cheers
kayakman

 

3.21 are 2wd hemi only.
3.55 and 3.92 are the only options for a 4.7 or any 4wd

 

Lets face the music....you don't like much of anything about this truck. You didn't buy what you really needed from the get-go and now it's Dodges fault. Just suck it up and either go get a hemi truck or live with it, but don't come on here and start making unrealistic claims about 65 mph in first with 3.92 gears. We are the guys that actually have 3.92 gears and know how they rev on these trucks. Sry you hate the truck but you bought it...we didnt

 

Totally agree with old man with a hemi.......Lets face the music....you don't like much of anything about this truck. You didn't buy what you really needed from the get-go and now it's Dodges fault. Just suck it up and either go get a hemi truck or live with it, but don't come on here and start making unrealistic claims about 65 mph in first with 3.92 gears. We are the guys that actually have 3.92 gears and know how they rev on these trucks. Sry you hate the truck but you bought it...we didnt ---OLD MAN WITH A HEMI


OK HERE GOES--
I have been towing 5th wheel trailers since 1990.
What are you towing and the weight of the trailer.. you think you have 3:92 axle???
Like I said earlier, CALL ANY RAM DEALER AND GIVE THEM YOUR V.I.N NUMBER!
THEY WILL GIVE YOU ALL THE SPECS ON YOUR TRUCK! The axle ratio, towing capacity, your options on that truck, every freaking thing you want to know..

A 4.7 litre is only 287 cubic inches. Your truck is rated some where between 6000-7000lbs. just according to what equipment, crew/quad/regular cab, axle ratio, etc. you have. Your tire size you have has affected your towing capacity a little bit as well. 1.67 inches in tire diameter difference changes your axle ratio a little bit too. And of course elevation you're towing.

http://www.1010tires.com/Tools/Tire-...0R17/285-75R17

is over 5% difference
a manufacturer's option not likely? a DEALER option yeah sure. they will sell ya anything.

265/70-17 - yes
275/70-70 option - yes
8x20's 275/60-20 option - yes

My neighbour bought a 2012 Silverado crew cab 4X4 4.8 litre 3:42 axle ratio and I bought a 2012 Outdoorsman quad cab 5.7 litre 3:92 axle that same year, now he wants to tow a travel trailer, he can, but not very big, approx. 5500lbs. My Ram is rated for approx. 10,050lbs. I tow approx. 7000+lb. 5th wheel with absolutely no problems


There are a lot of great people here to help you as well as manufacture train techs on this site.
You want help-- we'll help. Just Ask ..
60mph in second maybe...

 

I agree somewhat about first gear being too tall but Dodge is just playing the fuel mileage game. They are trying to keep the RPMs down to get the better economy but in so doing they are hurting the towing somewhat. This compromise is something we need to recognize and accept. Unfortunately some people get the 4.7 engine and they are really disappointed with the capability of that combo. The 4.7 with more torque, a manual trans, better gearing or wider spacing of the gearing of the auto trans would be a much better truck but it is what it is. Personally I would never get the 4.7 in any truck except a reg cab that I did not plan to tow or haul heavy with. JMO