Answer = depends...
if 2011 5.7L = 3th gear = 1:1 ratio
if 2012 5.7L = 4th gear = 1:1 ratio (2012 have 6 speed)
if 3.7L use fourth no matter which year
Edit = tow/haul mode offsets numbers numerically down one - you have to numerically go up one on the indicator - try with on and off for shits and giggles to see if the ecu offers more torque during, it also allows longer rev holding prior to upshift - this would be key to uncorking TQ at the ecu software level
2012 = http://www.wk2jeeps.com/2012/2012_wk...ifications.pdf
2011 = http://www.wk2jeeps.com/2011/2011_wk...tions_June.pdf
Scroll down for ratios
The goal is to use as close to 1:1 gear ratio in order to properly measure engine torque at the wheels.
warm it up first, get coolant and oil temp stable. get it rolling, though the gears, slap stick in manual 4 to limit 4th maximum, you will have to play with throttle vs rpm to find where is stays in fourth without downshifting when punching it. Then hold it down until rev cut, make it count. i would suggest making gradual initial pulls, not sure how your getting charged. Per pull or by the hour.
Torque is measured, HP is calculated from the measurement. Garbage data in = garbage data out
Since i helped you, help us here by posting up the details, year, miles on engine, etc... along with your dyno sheets. Numbers are numbers, we want graphs. interesting to see if you are close to nameplate / specs in the TQ and HP department.