AFAIK Yes. EDIT .... The motor drives the CDL to engage, and needs to be reverse powered to disengage.
When using the handbrake you lock both rear wheels so you also lock the rear tailshaft, so you also lock through the transmission( if in park) through to the front tail shaft and to at least one axle, or 2 if they both have traction. By locking the CDL I believe you have the exact same scenario, as the rear shaft is allready locked which inturn makes the front tailshaft locked to it( as previous) and it is the front diff that is slIppery that makes one front or both locked. Well really I have been talking in reverse here, it makes the front drive slip, or not slip if they both have traction.
yup, last time it snowed i locked the CDL to get in the driveway. In the morning when i drove out it was still locked. In the past too, i would lock the CDL when backing into the garage, so when my driveway was fully covered in snow later it would be easy to just floor it and leave.
Ok, thanks. It seemed obvious, but just wanted to confirm that. Then if I jack up the rear wheels with the CD locked and the hand brake engaged, are the front wheels braked? The front diff does not count here, since both front wheels would try to turn in the same direction.
I'm just theorising here, not that I would rely only on the hand brake to stop the car from rolling away or falling from the jacks.
i wouldnt rely on just the CDL and rear ebrakes engaged if you are planning on doing some maintenance. Block the front wheels also to prevent it from moving and use jack stands, dont just leave the truck up on the jack.