Vacuum disconnect
MJ>XJ
Joined: Mar 2009
Posts: 17,836
Likes: 7
From: Griffin, G.A.
Year: 1990
Model: Comanche
Engine: 4.0 I6
You completely misunderstood my post. Nothing about it was wrong, except your comprehension.
Having to pull two levers is still easier than getting out and locking hubs. What I was getting at is that pulling two levers isn't like having to get out, its just pulling two levers. Not really any more difficult than pulling the one lever.
Not exactly sure whats "all wrong" about that.

Having to pull two levers is still easier than getting out and locking hubs. What I was getting at is that pulling two levers isn't like having to get out, its just pulling two levers. Not really any more difficult than pulling the one lever.
Not exactly sure whats "all wrong" about that.

for say... 97+ Dana 30's were solid shaft on the pass side... there was no disconnect ran by anything... vacuum... electric... mechanical... nothing... just llike most other axles... you just stuck the 4x4 lever in 4x4 and went... they have no lock out hubs... the older XJ's were vacuum disconnect axles... when converted now you have your OEM 4x4 handle to the transfer case... and now another handle to pull to engage the 4x4 on the axle... no its not hard... no its not that big of a deal... yes it is that big of a deal when your installing the kit to do it that cost the same as a 97+ axle that will also include 760 axle joints which are stronger then the disco axles 297's...
if you talking about something different and calling it this then fine... no big deal... but i sure as heck no what im talking about...
Seasoned Member
Joined: Oct 2009
Posts: 414
Likes: 0
From: Portland, Oregon
Year: 1991
Model: Cherokee
Engine: 4.0L
Is there any disadvantage to permanently locking the front axle on one of these older D30's? What exactly would be the point of swapping in a non disconnect D30 if I can just lock the one I've got? Just to get the stronger u-joints?
If I'm understanding correctly one could also just swap non-disconnect axleshafts into an older housing, but it sounds like some custom parts are needed? Can someone elaborate on this, it that something worth doing or would it be better just to swap in the entire housing?
I'm pretty sure my D30 is ready for new ball joints & maybe other maintenance parts. Wondering if maybe I should just look for a newer D30 without the vacuum junk and with the better u-joints before I put any money into this one...
If I'm understanding correctly one could also just swap non-disconnect axleshafts into an older housing, but it sounds like some custom parts are needed? Can someone elaborate on this, it that something worth doing or would it be better just to swap in the entire housing?
I'm pretty sure my D30 is ready for new ball joints & maybe other maintenance parts. Wondering if maybe I should just look for a newer D30 without the vacuum junk and with the better u-joints before I put any money into this one...
Last edited by WantACherokee; Mar 8, 2011 at 03:48 AM.
whats wrong about that? is that you dont get out? nobody gets out of there jeep to put it in 4x4... because they dont have lock out hubs lol... XJ's TJ's ZJ's WJ's YJ's didnt have lock out hubs from jeep that you get out of the jeep to turn... WOW! my comprehension works great... maybe you mean something else but when you say "locking hubs"... i cant think of anything else that you would mean...
for say... 97+ Dana 30's were solid shaft on the pass side... there was no disconnect ran by anything... vacuum... electric... mechanical... nothing... just llike most other axles... you just stuck the 4x4 lever in 4x4 and went... they have no lock out hubs... the older XJ's were vacuum disconnect axles... when converted now you have your OEM 4x4 handle to the transfer case... and now another handle to pull to engage the 4x4 on the axle... no its not hard... no its not that big of a deal... yes it is that big of a deal when your installing the kit to do it that cost the same as a 97+ axle that will also include 760 axle joints which are stronger then the disco axles 297's...
if you talking about something different and calling it this then fine... no big deal... but i sure as heck no what im talking about...
for say... 97+ Dana 30's were solid shaft on the pass side... there was no disconnect ran by anything... vacuum... electric... mechanical... nothing... just llike most other axles... you just stuck the 4x4 lever in 4x4 and went... they have no lock out hubs... the older XJ's were vacuum disconnect axles... when converted now you have your OEM 4x4 handle to the transfer case... and now another handle to pull to engage the 4x4 on the axle... no its not hard... no its not that big of a deal... yes it is that big of a deal when your installing the kit to do it that cost the same as a 97+ axle that will also include 760 axle joints which are stronger then the disco axles 297's...
if you talking about something different and calling it this then fine... no big deal... but i sure as heck no what im talking about...
Pulling an extra lever is still less work than getting out and locking hubs.
How else are you going to eliminate the vacuum disconnect?
Either locking hubs or the mod you've mentioned that gets "kinked" often.
I never said any XJ or TJ or anything else you've listed came with locking hubs. You have been the only one bringing anything of the sort to this conversation.
Maybe your confusing yourself? I'm not sure...
But, again, you miscomprehended my entire post. Nothing about it was wrong.
All I was saying is that pulling an extra lever is still easier than getting out and locking hubs.
We are talking about the vacuum disconnect and ways to engage the front axle easier/stronger/more reliably, right?
Last edited by Gee oh Dee; Mar 8, 2011 at 12:18 PM.
MJ>XJ
Joined: Mar 2009
Posts: 17,836
Likes: 7
From: Griffin, G.A.
Year: 1990
Model: Comanche
Engine: 4.0 I6
No... that's not what were talking about... nobody said anything about locking hubs until you did... if you get rid of the disco setup... that doesn't mean you have to have locking hubs... I was talking to the op about ways to get rid of the disco and swapping the new axle in instead is his best bet... lock in hubs on a Dana 30 is stupid... I don't even know why your bringing them up... its not even something you swap out for a disco setup... your talking about something all in your own...
So you've never driven a truck with locking hubs? I'm pretty sure they don't have the same vacuum disconnect that the XJs do.
Thats the point of the locking hubs, right?
So I'll say again, instead of having to lock hubs outside the truck, I'd rather have a 2 lever system inside the truck.
Never once did I say any XJ came with locking hubs. Or any other truck you've mentioned.
Thats the point of the locking hubs, right?
So I'll say again, instead of having to lock hubs outside the truck, I'd rather have a 2 lever system inside the truck.
Never once did I say any XJ came with locking hubs. Or any other truck you've mentioned.
Senior Member
Joined: Jan 2011
Posts: 707
Likes: 0
From: Los Fresnos, Texas
Year: 2k
Model: Cherokee
Engine: 4.0
Originally Posted by huntingman2706217
what? ok... i give up... its hopeless... grab your last word im done with you...
He'll come and say something and you'll be forced to come right back. That's just how it works.
I'm just kidding btw so don't get upset.
No... that's not what were talking about... nobody said anything about locking hubs until you did... if you get rid of the disco setup... that doesn't mean you have to have locking hubs... I was talking to the op about ways to get rid of the disco and swapping the new axle in instead is his best bet... lock in hubs on a Dana 30 is stupid... I don't even know why your bringing them up... its not even something you swap out for a disco setup... your talking about something all in your own...
pulling two levers doesn't seem too difficult, its better than having to hop out and lock the hubs.
who ever said anything about lock in hubs? cherokees NEvER came with lock in hubs... so there is no getting out?
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
U-boat xj, how is it that your cherokee is a '92 and has a vacuum disconnect? Did you already swap axles with some older ones? Because if you didn't, YOU DON'T HAVE A VACUUM DISCONNECT, and these guys are arguing for nothing.



