KATOOM

The CAD is a great system but has a hard time standing up to the abuse of road salts, corrosion, and dried out rubber vacuum lines. But so does the rest of the cars and trucks out.

The way the CAD works is by using a vacuum switch on the top of the transfer case. Pull the shift lever to 4wd and the vacuum signal to the CAD is reversed.

The CAD trucks are a part time 4wd system which means the front driveshaft isnt spinning at road speeds in 2wd. So when you pull the transfer case shift lever into 4wd, there's a syncro ring on the front driveshaft output to the differential which speeds up the front driveshaft RPM's to match the front axles so that the CAD fork can engage the collar which mates the split two piece front passenger side axle.

Using a cable system for the CAD works if you dont like the vacuum setup.

The other benefit of the CAD for anyone who doesnt already know is the CAD system allows for the 2 lo kit which is AWESOME. The 2 lo kit uses a electric vacuum solenoid which re-routes the vacuum signal to the transfer case so that when in 4 lo you can flip a switch to engage the solenoid and bypass the CAD so the front axle remains disengaged. Thus 2wd lo range.

Great for backing trailers or simply creeping around slow roads.

Yeah, this is a very old thread too.