What type of transfer case is in my suburban, and how does it mechanically kick into 4x4?

[NorwegianViking]

Hey, i got a GMC Suburban 96' 5.7l 1500k and i was driving thru the snow on the road. When i decided to put it in 4 high and i just couldnt figure out how it mecanically (i presume) switched as soft as butter. Like there was more sound in the relay for the switch panel.

Could somebody try to explain it to me like the swithing mechanism and anyone who knows what the name of the transfer case is?

Thank you. Merry christmas.

 

[MIHELA]

Should be a New Process 243C. It works the same way as the manual shifted case, but instead of a manual linkage it has an actuator motor on the side of the case to move the sector. The front axle disconnect also works the same way as a manual case.

 

[Komet]

NP241C is the lever shift one, NP243 is the push button shift. They're pretty much the same except the NP243 has a shift solenoid obviously. The physical switching engages some forks that push gears around to send power to the front driveshaft. Simultaneously a switch sends power to the front diff actuator which either heats up some oil or has an electric motor to lock the front axle.