The 89 cherokee will still have a vacuum operated front axle, they didn't do away with them until 91 or 92. There is a way to convert the earlier axles to live, it just requires installing the inner seal and a solid axle shaft, no biggie. That 4cyl is likely to have deep gears though maybe 4.10 or 4.56 if it's an auto tranny.....
You're not speaking my language... is deep gears good or bad?
I remember back when I had an 86 cherokee, it had a lever that I'd pull to put it in 4h or 4L... that was still vacuum operated?
Basically what i'm looking for is, would I be able to buy this jeeper, steal the parts and make them work, or would I be better off looking for a 1992 ish model?
Sorry, lol, yes (**edit** Some**) earlier xjs had a vacuum actuated axle, similar to the pre shift on the fly eagles. The difference with the xj, was that when you pulled the lever for 4wd, it activated a kind of a clutch like motor to speed up the front driveshaft. Once it matched the speed of the rear shaft it would put vacuum to the axle, to lock it in.
If you are building a wheeler with a bigger tire (say bigger than 33"), the deeper gear will benefit you, especially if you have an overdrive tranny. If not, and you are staying relitively small (31" for example), you'll be revving the heck out of it on the highway.
Vac operated front axle shag? My big guy eagle has an 89 front axle no vac. It was a 4.0 however.
Hmmm, that's odd, my friends 90 or 91 still had the vacuum set up (4.0, 5 speed), where as my 92 didn't. Maybe it was luck of the draw in the late 80's early 90's.
So to MontanaEagle I could be mistaken on my statement, best would be to check it out personally. On the passenser side of the axle tube is where it would be....Whether you should look to a different vehicle....It really depends on where you want you vehicle to end up (use wise). The only way to be certain of what it has will be to look at it, many of these will have gear ratio tags attached to the diff cover too.