they do because that clutch is engaged depending on when you turn the dial there - it has to have a electronically controlled clutch to move in and out based on a electronic command line.

What I don't know for certain if is it does the same 2-5% duty cycling so as to keep some torque on the driveline in forward gear (I guess in reverse too but I don't know that either)

I have no way of finding this out either - well not in any timely manner. I would think the shop manual description that shows the PWM pattern you mentioned earlier - would also cover this one too. If there wasn't some major programing difference between then you could basically command either device for 4A. Since you can't just do that without trading all the hardware and telling the PCM to send to commands too - then I suspect there is a major difference in operation logic.

Guess on my part. Otherwise - they'd just be the exact same unit and computer controller. - and you're just missing a command string if you don't have the 4A switch.


My biggest thing - with the clutch system and computer interlink - why the hell is there still IWE's? build it with the hubs active (locked whatever) and control it with the clutch system. Course I also see no real benefit to a high and low today either but that's a longer rant.

 

I got my truck back from the dealer this morning. They rebuilt the front diff (ring and pinion gears are ok). No noise, extremely quiet!

 

I'm very disappointed that the front diff bearings needed replacing only after 73K miles!