4wd drops out when going to lower gears/ higher revs in 4H and 4L. Is good on beach with a good start but 4wd will not hold in softer sands.

what transfer case is there.(BOX)
most trucks sold had 2 or more versions sold. day 1 new.
usage and repairs not the same nor tests.
fuses good.
try the truck sitting offroad, dirt/sand/gravel , ice/snow?) not on pavement but off it.
part time 4wd is not for pavement as the manual lost told you.
full time yes!, part time is for offroad or say ice/snow.
there is no FULL TIME here.
so move truck to dirt and test PART TIME 4wd
or move truck to ICE and test.

2006 dodge ram Pickup 1500
manual
https://www.dezosmanuals.com/wp-content/uploads/2021/07/2006-Dodge-Ram-Truck.pdf


pages 308 to read are
so yours is #2
are equipped with
either a Manually Shifted transfer case or an Electroni-
cally Shifted transfer case
When additional traction is required the transfer case 4H
and 4L positions can be used to lock the front and rear
driveshafts together and force the front and rear wheels
to rotate at the same speed. This is accomplished by
simply moving the shift lever to the desired positions.
The 4H and 4L positions are intended for loose, slippery
road surfaces only. Driving in the 4H and 4L positions on
dry hard surfaced roads may cause increased tire wear
and damage to the driveline components.
same speed MEANS PART TIME 4WD, not full.
see the ONLY word, it does not lie to you.

this may not be full time nor AWD
may be part time s, 4wd for off road use. or ON ICE
means ICE over pavement, or ICE over DIRT
6 transfer cases offered day1 new so says a real service manual this car.

this is a part time 4wd, not AWD.
and as such must not be run on dry ice free pavement.
so post if car is on said pavement.
test 4wD in DIRT, does it work now, or not?
if you keep doing it on dry pavement this happens.
see here
http://www.rubicon-trail.com/4WD101/driveline-bind.html

read the wiki on all system. and see what you can do and can not.

its not AWD, and has no CENTER differentiable gears.

normal driving 2h if using 4wd use 4h to drive on roadway 4l is a lower gearing that is usually used to get thru something slowly than if try to drive normal in low can damage motor or transfer case read ur manual it explains how and when it is advisable to use ur 4wd

Possible actuator motor issue have it tested.

1. • 1 Start your Dodge truck's engine.
     
   • 2 Turn the electronic transfer case from "2WD" to "4WD Lock" to engage the high range 4WD, if the dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" to "4H." The electronic transfer case is located on the instrument panel and is marked with "2WD," "4WD Lock" and 4WD Low." The lever-equipped transfer case is located to the right of your leg and is marked with "2H," "4H" and "4L."
     
   • 3 Shift the transmission into "Neutral" while the vehicle is either stopped or rolling at 2 to 3 mph to begin engaging in the low range 4WD. Turn the electronic transfer case to "4WD Low," if the Dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" or "4H" to "4L."
     
   Tips & Warnings
   • Indicator lights will come on and alert you that your vehicle is in either the high or low range of 4WD.
     
   • Do not engage in the low range of 4WD drive if the transmission is in gear; you must shift to "Neutral" first.
     
   • Many Dodge trucks allow you to shift from 2-wheel drive to the high range of 4WD at up to 55 mph--consult your truck's manual to ensure that this is possible. Do not exceed 55 mph while engaged in the high range of 4WD. Do not exceed 25 mph while engaged in the low range of 4WD.
     
   • Do not engage in 4WD unless you are on slipper or rocky roads.
     

Hi - Here is instruction how to do.

From N to 4H

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to shift into "4H".

From 4H to 4H LOCK

You can operate the transfer switch either

when the vehicle is stopped or while the

vehicle is moving.

Position the front wheels straight ahead

and turn the switch to shift into "4H LOCK".

If the vehicle is moving, we recommend

that the speed be less than 100 km/h (60

mph) during this operation.

NOTE:

• When shifting between the transfer

switch position and the transfer gear

position is unmatched, all 4WD indicators

will blink and the buzzer will sound.

• If it is difficult to shift between "4H" and

"4H LOCK" while the vehicle is moving,

try accelerating and decelerating your

vehicle several times after turning the

transfer switch. Be sure to wait until traffic

conditions allow you to accelerate and

decelerate safety before using this procedure.

From 4H LOCK to 4L LOCK

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to shift into "4L LOCK".

From 4L LOCK to 4H LOCK

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to shift into "4H LOCK".

From 4H LOCK to 4H

You can operate the transfer switch either

when the vehicle is stopped or while the

vehicle is moving.

Position the front wheels straight ahead

and turn the switch to shift into "4H". If the

vehicle is moving, we recommend that the

speed be less than 100 km/h (60 mph) during

this operation.

NOTE:

• When shifting between the transfer

switch position and the transfer gear

position is unmatched, all 4WD indicators

will blink and the buzzer will sound.

• If it is difficult to shift between "4H" and

"4H LOCK" while the vehicle is moving,

try accelerating and decelerating your

vehicle several times after turning the

transfer switch. Be sure to wait until traffic

conditions allow you to accelerate and

decelerate safety before using this procedure.

From 4H to N

64J209

Stop the vehicle completely, place the

transmission in "N" (Neutral) and depress

the brake pedal and the clutch pedal fully

(if equipped), then push in and turn the

switch to the mark (1) at the left of the "N"
position, and hold the switch in this posi-

tion for 5 seconds until the "N" indicator

blinks, then turn the switch to the "N" position.

When you turn the transfer switch to the

"N" position, "N" indicator will come on with

the buzzer sound.

CAUTION

• Be sure to stop the vehicle completely

before operating the transfer

switch to shift between "N" and

"4H", or between "4H LOCK" and

"4L LOCK".

• Do not shift between "4H" and "4H

LOCK" unless the front wheels are

in the straight-ahead position and

we recommend that the vehicle

speed be less than 100 km/h (60

mph).

Do not operate the transfer switch

while tires are racing.

• Do not operate your vehicle in "4H

LOCK" or "4L LOCK" on dry, hard

surfaces.

(Continued)

CAUTION

(Continued)

• Do not operate the vehicle while a

4WD mode indicator is blinking

except when shifting between "4H"

and "4L LOCK".

If you operate the vehicle while a

4WD mode indicator is blinking, a

buzzer will sound and the transfer

will shift to "N" (Neutral) to prevent

transfer case damage.

In this case, use the following procedure.

1) Depress the clutch pedal fully (if

equipped) or shift the automatic

transmission gearshift lever to the

"N" position.

2) Turn the transfer switch to the

position previously selected.
3) Operate the transfer switch again.

just found this worked a trick..mine stuck for two weeks in 2wd

A mere 2,400km into the life of my 07 Rodeo TD 4WD, I used 4L for about 2km of medium-steep/slippery track. After stopping and selecting 2WD the 'Check 4WD' light appeared, meaning I was stuck in 2WD for the rest of that trip. Luckily I was able to complete the trip in 2WD without incident.

The dealer blamed me for 'not following the instructions in the manual' (utter codswallop), 'fixed' it, and very reluctantly gave me a scribbled set of instructions on resetting the system, which I've included below.

When I suggested that these instructions should be included in the manual, the response was 'not necessary if owners use the system correctly'. More cods.

Here's how to reset it:

1. Ignition off, hold all 3 buttons (2H, 4H & 4L) in together

2. Switch ignition on to 'reds' position (last position before start)

3. Hold in this state for 30 seconds

Hope this may be of use !!

If it is automatic transmission you must stop vehicle put it in neutral or "n" then put shifter that is indicates 2h 4h and 4L pull down to 4h if you are driving on highway or pull down then over and up to 4L if you are not going to be driving faster than 30mph.
If manual put in neutral also and do the same process as automatic there will be a light on dash board indicating that it is in 4wd also put transmission back to drive on automatic or shift to first gear on manual

you don't have to be in neutral to go to 4H , but you do have to be in neutral to go into 4L

4h means high range 4wd and 2L and 4L means 2 wheel and 4 wheel low range. low range is used when going through washouts and down washed out hills etc. do not use the brake as the vechile may slide. low range is basically just letting the car do the work and idle it down hills etc where 4wd is needed. don't try to drive normally while any 4wd is engaged as you will damage it.