goblinish15

So when i shift into 4 wheel drive it goes to 2 wheel drive. When i shift into 2 wheel drive it goes to 4 wheel drive. So is this why my 4 wheel drive doesnt work? Cuz before i put it into 4 wheel drive and got grinding gears sound and once it worked for like 5 minutes and then stopped working

goblinish15

bump

goblinish15

bump!

goblinish15

anyone know?

Gee oh Dee

Something may have been assembled backwards by a previous owner.

But that doesn't quite make sense to me.

dukie564

you have a vacuum disconnect front axle. Likely a vacuum leak is causing your issues. Very common on older XJs with this axle.

search d30 vacuum disconnect bypass for the fix.

Gee oh Dee

Why would it have 4wd when 2wd is selected, then?

dukie564

perhaps vacuum lines are reversed

Gee oh Dee

Wouldn't that just keep the front axle locked in when in 2wd and unlocked when in 4wd?

I mean, you gotta activate the Tcase when switching to 4wd, otherwise the front DS gets no power, right?

From what I got in the OP's post he's got 4 when he selects 2 and the other way around when selected to 2wd.

dukie564

hmm true...

OP how do you know they are reversed?

Gee oh Dee

Now you see my confustion.

It just doesn't make sense to me.

goblinish15

I replaced the diaphram and shifter fork a month ago and it worked amazing for a month. Then it just started doing the zzzzzz sound and stopped working. so I took off the fork. I put it in 4 high and watch the fork move to 2 wheel drive. Then i shifted to two wheel drive then watched the fork shift to 4 wheel drive. I reversed the hoses and it still did the same thing!

freegdr

is it on 180 the wrong direction

Gee oh Dee

The box on the axle itself?

Thats about the only thing I could imagine.

I still don't know, unless I'm misunderstanding the OP.

goblinish15

Thats what i though but i switched the vac lines back and forth and the same thing happened