I see that on the non-rebel trims, that have the four wheel drive option there is a button selector to put the 4wd in auto mode. The rebel is missing this button, so is safe to assume that the Rebel is 4wd always on by default? Or not?
Here is the information for RAM transfer case I found in internet. If the information is true, two take away from the doc. (1) 48-11 case is a better one compare to 48-12 which Rebel installed (2) Customer can pick which transfer case they want.
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"Transfer cases get upgrades Buyers who equip their 2019 Ram 1500 with a four-wheel drive drivetrain can choose between two electronically controlled transfer cases: the BorgWarner 48-12 for part-time 4WD operation with Hi and Low ranges; and the BorgWarner 48-11 for on-demand 4WD. Both transfer cases engage via a push-button control mounted underneath the rotary gear selector on the instrument panel.
The transfer cases are upgraded internally for more robust performance in conjunction with the increased payload and towing capabilities of the new truck. Changes include a larger-diameter main shaft, relocation of the chain and sprocket for improved bearing support, and improved lubrication. Also, the on-demand system is enhanced for quicker response and higher front output torque capacity.
The 48-12 part-time transfer case provides three operating ranges 2Hi (2WD), 4Hi (4WD) and 4Lo (low-range reduction 4WD) plus a neutral position. 2Hi is designed for any road surface at any time, while 4Hi and 4Lo are for offroad use or slick surfaces. The driver can switch between 2Hi and 4Hi while the truck is in motion. To engage 4Lo, the transmission must be in neutral.
The low-range reduction ratio (crawl ratio) for 4Lo is 2.64:1, which provides increased low-speed torque capability for pulling power and improved driver control in off-road conditions.
The on-demand transfer case has 4Auto, 2Hi, 4Hi and 4Lo selections. 4Auto provides full-time 4WD, responding automatically to provide maximum traction in all road conditions. 2Hi, 4Hi and 4Lo function equally to the part-time transfer case."