I'm just throwing this out there... but the owner's manual states the Tru-Lok feature will only activate when the following conditions are met:

- Key in ignition, vehicle in 4L (low) range
- Vehicle speed should be 10mph (16km/h) or less.

It does make you wonder why Jeep would set the limitations on the axle lock function like that.

I know when I activate my front locker my steering pretty much goes away or is very limited... so how well is the steering if the front lockers are engaged at higher speeds (i.e. while in 4Hi)?

 

In thick mud, much better than without. High wheel speed in mud does not translate into high vehicle speed. I completely agree with you on hard surfaces though. Even in gravel or moderately loose stone, the steering is less than desirable locked in the front.

 

Your Wrangler appears to be a 2010 or earlier (by the looks of the interior) - you may want to check into the Traction Control System on your Rubicon. I know the 2012's owner's manual states that in 2Hi or 4Hi if any wheel slippage is detected the TCS system will brake the opposite tire to create limited-slip condition and increase the traction under higher speeds. The TCS is even supposed to engage on the front wheels when the locker is engaged in the rear and only disengage when the lockers are engaged.

My only suggestion is to be really careful at the higher speed so as not to tear something apart due to the lockers being engaged.