Sure use it reverse. I often do when getting my 5th wheel in to some boondocking location. As been said less stress in the system.

 

Ok thanks.

 

Lol... I was reading the manual earlier, and saw this:



Edit - also, the manual actually recommends switching to 4L if you get stuck going up a hill, then backing down. So, no problem in reverse.

 

"In 4L (4X4 low), the electronic locking
differential will automatically
disengage at speeds above 62 mph
(100 km/h) and will automatically
reengage at speeds below 56 mph
(90 km/h)."

You sure about that ?

 

Right here on page 220 of the 2020 owners manual it states it.

ELECTRONIC LOCKING
DIFFERENTIAL (IF EQUIPPED)
Note: The electronic locking differential is
for off-road use only and is not for use on
dry pavement. Using the electronic locking
differential on dry pavement will result in
increased tire wear, noise and vibration.
The electronic locking differential is a
device housed in the rear axle that allows
both rear wheels to turn at the same
speed. The electronic locking differential
can provide additional traction should your
vehicle become stuck. You can activate
the differential electronically and shift it
on the fly within the differential operating
speed range. The differential is for use in
mud, rocks, sand, or any off-road condition
where you need maximum traction. It is
not for use on dry pavement.
The following conditions will affect the
electronic locking differential:
• The electronic locking differential will
not engage if your vehicle speed is
above 20 mph (32 km/h) in 4x2, or 4x4
High modes.
• The electronic locking differential will
not engage if your vehicle speed is
above or 56 mph (90 km/h) in 4X4
Low.
• The electronic locking differential may
not engage if you press your
accelerator pedal during an
engagement attempt. A message may
display in the instrument display
guiding you to release the accelerator
pedal.
• In 4x2, and 4x4 High modes, the
electronic locking differential will
automatically disengage at speeds
above 25 mph (41 km/h) and will
automatically reengage at speeds
below 20 mph (32 km/h).
• In 4L (4X4 low), the electronic locking
differential will automatically
disengage at speeds above 62 mph
(100 km/h) and will automatically
reengage at speeds below 56 mph
(90 km/h).
• The AdvanceTrac system has the
ability to take over control of the
electronic locking differential and
disable it during driving maneuvers
when necessary.
When you switch the system on, if you do
not meet the required conditions for
electronic locking differential activation,
the instrument cluster will display the
appropriate information guiding you
through the proper activation process.
Activating the Electronic Locking
Differential
Note: Do not use electronic locking
differential on dry, hard surfaced roads.
Doing so will produce excessive noise,
vibration and increase tire wear.
Note: If the electronic locking differential
has difficulty disengaging, release the
accelerator pedal and turn the steering
wheel in the opposite direction while rolling.

 

Is it me, or is that completely contradictory to itself and the real world. 62 mph in 4 low and 90 other contradictions............Some one screwed up.

 

Well, sir; quite a few years ago I was riding with a guy that had a 75 or 76 F150 (don’t know exactly what gearing he had) and he had that doing about 65-70 in 4L!!!
The old 390 was wound pretty tight though! As a side note, there was just a little adult beverage involved at the time (I DO know better now)! And we WERE a long way from any public roads.

 

I thought the same. I do know when I lock mine in it will disengaging at ths low mph (20 mph +/-) and flash the message on the display when disengaging and reengaging.