I have 2010 TRX4 with the 4.7, which I think has the 3.92 gearing.
I never really noticed or cared until I both moved to the mountains AND started towing. 1st gear goes redlines near 60mph! And if you know this engine, you know it has NO power until around 3000rpms. So if I'm starting from a stop, going uphill with a trailer, I often can't go at all. It just doesn't have the power down low. I know the engine has power, but the insanely poor gear choices Dodge made doesn't let me access it.
Does anyone notice this or have any suggestions?
I live at 7200 feet, so I'm already down almost 30% on power, so I know that doesn't help, but that doesn't change the ridiculous gearing.

 

Dunno, I've got a 5.7L with 3.21's and it tows fine. I think that buying a 4.7 to tow at altitude is your problem, not that there is something inherently wrong with the gear selection.

 

the 1st gear in the 545/65RFE is 3.00 so it's pretty lame. The Hemi has enough torque to overcome it but the 4.7 is pretty anemic torque wise. The new 8 speed has a ratio of 4.7, this makes a huge difference, hell, even 2nd in the 8 speed is 3.13.

 

i agree the larger engine would be better, but that doesn't change the fact that a vehicle with a tow package has such an incredibly tall 1st gear. I'm quite certain dodge did it in order to achieve better mpg since you can't accelerate all that hard at low speeds.
Kepp in mind, before downplaying the 4.7, that it has as much power as the large engine did just a few years prior, and gets about 8mpg better. It has plenty of power, it is just not reachable until above 30 mpg due to poor engineering choices.
FWIW, I bought it living at sea level

 

They gave me a Ram with the 4.7 as a loaner once,it seemed like it had much more power with the flex fuel rather then normal gas, was it me? ,or is it that way?

 

Dunno, last time I checked pretty much every automatic made had a 1st gear between 2.75 and 3.00. You don't get different transmission gear ratios with tow packages.

 

1st gears on current transmissions
Chrysler ZF8HP = 4.70
Chrysler 68/66RFE = 3.23
Chrysler 545/65RFE = 3.00
Ford 6R80 = 4.17
Ford 6R140 = 3.97
Allison 1000 = 3.10
GM 6L80/90 =4.03
Toyota AB6xx (5.7) = 3.33
Toyota A760x (4.7) = 3.52
Nissan RE5R05A = 3.83

 

Meh, somehow we managed to tow with ratios in the 2's and 3's with significantly less torque and HP


TH350 2.52
TH400 2.48
TH700-R4 3.06
4L60 / 4L60-E 3.06
4L80E / 4L80-E 2.48
C4 & C6 2.46
727 2.45
904 2.70
Borg-Warner T56 2.97

 

I suspect he's got too much trailer behind him.

In the old days, if you had a small engine like a 4.7 (318 CID) you got it with a manual and got granny gear 1st. Most of the vehicles from that vintage used for towing had big blocks with gobs of low end torque. We had 383s. 440s. 454s, 460s etc (Even the buick 350 I have in my wagoneer is rated at 360 lb-ft at 2600 rpm). My first real towing vehicle was a 1966 chevy pickup with a 292 six banger one barrel carburator (oil bath filter), granny first and a 4.10 rear, that truck was a stump puller.

 

Yup, and unrealistic expectations from the 4.7 in a nearly 3 ton truck