This Rubicon is for my wife. I am trying to find out if 4:1 Rock-Trac hd full time 4wd drive, means you can simply put the drive train in full time four wheel drive and forget about it. Drive on dry pavement, snow etc. It would appear that on the 4XE Rubicon you now have this feature, unlike the standard Rubicon you have 2wd and when you need 4wd you have to shift into it.
RUBICON 4XE - 4:1 ROCK-TRAC HD FULL TIME 4WD DRIVE
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Welcome @Brick57! When are you taking delivery?
This is what I found on the main 4xe page Jeep has up currently:
"ADVENTURE CAPABLE
Traction on Any Track
The 2021 Jeep® Wrangler 4xe will fuel your adventures with already tested and proven Jeep 4x4 hardware. The “Original” go-anywhere-4x4 continues its undisputed 4x4 leadership with 4xe technology.
The Wrangler 4xe is first and foremost a Jeep Wrangler with Trail Rated® running gear: solid front and rear axles, full-time 4x4 two-speed transfer case, fully articulating suspension and 76 cm (30 in) of water fording capability.⁎ The 2.0L I-4 DOHC direct-injection Turbo plug-in hybrid engine is paired with the Selec-Trac® Full-Time 4x4 System or, on Rubicon® models, the Rock-Trac® Full-Time 4x4 System to provide an effortless ride with optimum traction on any terrain.
Plus, impressive amounts of power and torque are sent to each wheel by the combination of a 17 kWh lithium-ion battery pack, regenerative brake booster, and 8-speed PHEV automatic transmission."
This is what I found on the main 4xe page Jeep has up currently:
"ADVENTURE CAPABLE
Traction on Any Track
The 2021 Jeep® Wrangler 4xe will fuel your adventures with already tested and proven Jeep 4x4 hardware. The “Original” go-anywhere-4x4 continues its undisputed 4x4 leadership with 4xe technology.
The Wrangler 4xe is first and foremost a Jeep Wrangler with Trail Rated® running gear: solid front and rear axles, full-time 4x4 two-speed transfer case, fully articulating suspension and 76 cm (30 in) of water fording capability.⁎ The 2.0L I-4 DOHC direct-injection Turbo plug-in hybrid engine is paired with the Selec-Trac® Full-Time 4x4 System or, on Rubicon® models, the Rock-Trac® Full-Time 4x4 System to provide an effortless ride with optimum traction on any terrain.
Plus, impressive amounts of power and torque are sent to each wheel by the combination of a 17 kWh lithium-ion battery pack, regenerative brake booster, and 8-speed PHEV automatic transmission."
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Welcome to the forum @Brick57, I don't think the 4:1 Rock Trac on the Rubicon has the auto feature to switch from 2WD to 4WD I think that's on the Selec-Trac system in the base and Sahara models.
This is from Jeep's press release for the 4xe.
The new Jeep Wrangler 4xe is available in three models: 4xe, Sahara 4xe and Rubicon 4xe. Wrangler 4xe and Wrangler Sahara 4xe models are equipped with full-time 4x4 systems, front and rear next-generation Dana 44 axles and are fitted with the Selec-Trac two-speed transfer case with a 2.72:1 low-range gear ratio. The intuitive system allows the driver to set it and forget it in any environment.
An available Trac-Lok limited-slip rear differential provides extra grip and capability in low-traction situations, such as driving over sand, gravel, snow or ice.
Wrangler Rubicon 4xe models carry the Rock-Trac 4x4 system that includes a two-speed transfer case with a 4:1 low-range gear ratio, full-time 4x4, front and rear next-generation Dana 44 axles, Tru-Lok electric front- and rear-axle lockers. The Wrangler Rubicon 4xe has an impressive crawl ratio of 77.2:1, which makes scaling any obstacle easy. Wrangler Rubicon models also offer improved articulation and total suspension travel with help from a front axle, electronic sway-bar disconnect. Together, these components contribute to the maximum off-road prowess Wrangler Rubicon is known for.
This is from Jeep's press release for the 4xe.
The new Jeep Wrangler 4xe is available in three models: 4xe, Sahara 4xe and Rubicon 4xe. Wrangler 4xe and Wrangler Sahara 4xe models are equipped with full-time 4x4 systems, front and rear next-generation Dana 44 axles and are fitted with the Selec-Trac two-speed transfer case with a 2.72:1 low-range gear ratio. The intuitive system allows the driver to set it and forget it in any environment.
An available Trac-Lok limited-slip rear differential provides extra grip and capability in low-traction situations, such as driving over sand, gravel, snow or ice.
Wrangler Rubicon 4xe models carry the Rock-Trac 4x4 system that includes a two-speed transfer case with a 4:1 low-range gear ratio, full-time 4x4, front and rear next-generation Dana 44 axles, Tru-Lok electric front- and rear-axle lockers. The Wrangler Rubicon 4xe has an impressive crawl ratio of 77.2:1, which makes scaling any obstacle easy. Wrangler Rubicon models also offer improved articulation and total suspension travel with help from a front axle, electronic sway-bar disconnect. Together, these components contribute to the maximum off-road prowess Wrangler Rubicon is known for.
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From my Rubicon 4xe build sheet
4:1 Rock-Trac HD Full Time 4WD Sys
So I believe even the 4xe Rubicon has the option of full time 4wd, and according to the owners manual can be used all the time in all weather and road conditions
I checked my build sheet and it says 4:1 Rock-Trac HD Full Time 4WD as well,so I guess it is a standard feature for the 4xe.. Seems pretty cool when reading a bit about it. It seems to just auto switch between 2wd and 4wd depending on slippage. Assume you can still manually force it to 4wd when on the trail.
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I might be wrong then, the wording on the press release is a bit weird.
If it's like the system on this Jeep there's a 4WD Auto, 4H Part time, and 4L to switch to.
Thanks for the input. My current understanding is the Rubicon 4XE has 5 positions in the transfer case. 2wd, 4wd auto, 4wdpt, n, and 4wdl. in the 4wdl you can lock the diffs. I don't know about locking the diffs in 4wdpt. Well im going up today to order mine. Its going to be loaded, and most of all, the exterior aesthtics is going to be just how my boss (wife) wants it. Her first love was our 2 door Wrangler and she want to get back to her roots. White color with a black hard top, black fenders, black grill. We wanted to get a step rock rail as offered in the gas models but not availabe in the 4XE build. So were going to order the step rock rail for the gas model and the dealer said he would install it for us. Funny how when you get into your sixties things you would have not considered before become wonderful additions. 
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Oh that's pretty cool. I look forward to seeing how it fits on the 4xe!Thanks for the input. My current understanding is the Rubicon 4XE has 5 positions in the transfer case. 2wd, 4wd auto, 4wdpt, n, and 4wdl. in the 4wdl you can lock the diffs. I don't know about locking the diffs in 4wdpt. Well im going up today to order mine. Its going to be loaded, and most of all, the exterior aesthtics is going to be just how my boss (wife) wants it. Her first love was our 2 door Wrangler and she want to get back to her roots. White color with a black hard top, black fenders, black grill. We wanted to get a step rock rail as offered in the gas models but not availabe in the 4XE build. So were going to order the step rock rail for the gas model and the dealer said he would install it for us. Funny how when you get into your sixties things you would have not considered before become wonderful additions.
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Had auto 4wd on Jeep Grand Cherokee and having this standard on 4xe is a great feature (on higher trim gas JLU models it is optional). Acts like 2wd but once you start loosing traction the tansfer case automatically engages the front axle which is great on any low traction surface. It does this seamlessly without the axle bind you get when turning with full time 4wdhi and 4wdlo.
Jeep 2021 Wrangler link to the Wrangler catalog. Page 7 gives some info.
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