[hanlondave95]

It should have a high pinion for the XJ but I can’t see it. It is a D30.
The axle disconnect is not a necessity.

 

[hanlondave95]

What year Cherokee had no vacuum 4wd hookup? Thought they all would’ve had that setup.

I think it went away about 91.

 

[hanlondave95]

Tcase goes 2x4 or 4x4 and low...

The CAD was to make it like it had Hubs like in the old days it would free spin. Then they went to No cad and the front turns. Like all TJs and JKs But Now guess what its back all JLs have cad too and its trouble as well. fails

Worked on a 2016 Ram 2500 today and it has a CAD axle.

 

[hanlondave95]

4WD happens in the T-case. If the axle is always connected it will work. The vacuum is useless.

 

[hanlondave95]

Read about the 228 here. The Novak Guide to the New Process 208, 219, 228 & 229 Transfer Cases as found in FSJ & XJ Jeeps, 1980-1991

"The NP228 had a direct-drive 2wd mode. It used an internal, open differential for four-wheel-drive mode and high range and featured a fully locked mode in four-wheel-drive, low range. It featured vacuum actuation for mode operation and a conventional shifter linkage for range operation. This transfer case was used in the XJ Cherokees as the optional in lieu of the NP207.

The NP229 was similar to the NP228, but it featured an internal viscous coupling for full-time operation. This transfer case was offered in the FSJ Grand Wagoneer."

228 rang a bell but that refreshes my memory....
That’s really early XJ system.
It would have a vacuum switch/lever on the dash that engages the T-case and a shift lever for low range.
And my mistake, yes you need vacuum to the case shift motor and I don’t believe they used a CAD yet.
I remember all the needles fall out when you split the cases !! 😱