Front axle question - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-02-2006, 05:02 PM   #1
Jeeper
 
jj33002's Avatar
 
Join Date: Feb 2006
Location: Atkins, AR
Posts: 157
Front axle question

On the passenger side it has that little box where the axle is split, it has that fork with the little "gear coupling" or whatever it is inside there. I was wandering how that worked. Does it engage the passenger side wheel when you put it in 4x or what? If you can tell I know nothing about how it is supposed to work so all the info I can get will help.

__________________
'95 wrangler, SQUARE HEADLIGHTS, 4 cyl., 5 spd., 4" superlift w/rancho rs9000 series shocks with in dash controller, 2" body lift, 35x12.5 15 tires
SureFire x300
jj33002 is offline   Quote Quick Reply
Old 05-02-2006, 05:22 PM   #2
Jack Lives Here!!!

WF Supporting Member
 
1BLKJP's Avatar
 
Join Date: Apr 2005
Location: Phoenix, AZ
Posts: 7,764
That is called a Vaccum Disconnect. It has vacuum lines going to both the engine and the TCase. When you you put the Tcase in 4wd the vacuum created moves that shift fork over and engages the passenger side axle shaft.

This was not the brightest thing that Jeep had done with the YJ/XJ Dana 30 axles back in the 80's and early 90's. The vacuum lines can become brittle and break and then you lose it's function. A lot of guys go to a manual cable disconnect called a Posi-Lok.

__________________
Thanks,
Jack Hickman

President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
1BLKJP is offline   Quote Quick Reply
Old 05-02-2006, 05:54 PM   #3
Jeeper
 
jj33002's Avatar
 
Join Date: Feb 2006
Location: Atkins, AR
Posts: 157
So what is the best way to tell if it is working or not? I am not 100% sure but I think the last time I went offroad my passenger side did not seem like it was engaged.
__________________
'95 wrangler, SQUARE HEADLIGHTS, 4 cyl., 5 spd., 4" superlift w/rancho rs9000 series shocks with in dash controller, 2" body lift, 35x12.5 15 tires
SureFire x300
jj33002 is offline   Quote Quick Reply
Old 05-03-2006, 08:39 PM   #4
Jack Lives Here!!!

WF Supporting Member
 
1BLKJP's Avatar
 
Join Date: Apr 2005
Location: Phoenix, AZ
Posts: 7,764
Quote:
Originally Posted by jj33002
So what is the best way to tell if it is working or not? I am not 100% sure but I think the last time I went offroad my passenger side did not seem like it was engaged.
That is the exact way you can tell if it's not working properly.
__________________
Thanks,
Jack Hickman

President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
1BLKJP is offline   Quote Quick Reply
Old 05-03-2006, 10:46 PM   #5
Jeeper
 
jj33002's Avatar
 
Join Date: Feb 2006
Location: Atkins, AR
Posts: 157
So if I find out that it is not working properly, what would be the first thing I could check, so that I could get it working again?
__________________
'95 wrangler, SQUARE HEADLIGHTS, 4 cyl., 5 spd., 4" superlift w/rancho rs9000 series shocks with in dash controller, 2" body lift, 35x12.5 15 tires
SureFire x300
jj33002 is offline   Quote Quick Reply
Old 05-03-2006, 10:50 PM   #6
IITYWTMWYBMAB

WF Supporting Member
::WF Administrator::
 
4Jeepn's Avatar
 
Join Date: Apr 2005
Location: Florence, KY
Posts: 10,078
Images: 5
Check the vacum lines at the connections. Also there is a kit they sell that removes the vacum and give you a solid axle shaft vs the 2 pc one.
__________________
79.96.85.00.01.97.00.97.93.97.95.94
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ
4Jeepn is offline   Quote Quick Reply
Old 05-04-2006, 09:43 AM   #7
Jeeper
 
jj33002's Avatar
 
Join Date: Feb 2006
Location: Atkins, AR
Posts: 157
Thats cool, how much does one of those kits run? Where would I get it from?
__________________
'95 wrangler, SQUARE HEADLIGHTS, 4 cyl., 5 spd., 4" superlift w/rancho rs9000 series shocks with in dash controller, 2" body lift, 35x12.5 15 tires
SureFire x300
jj33002 is offline   Quote Quick Reply
Old 05-04-2006, 12:01 PM   #8
Jeeper
 
NY94YJ's Avatar
 
Join Date: May 2005
Location: Malta NY
Posts: 307
4x4 POSI-LOC in Quadratec $199.99

A little steep for essentially a brake cable from a 12speed bicycle, but it will work. There are write up on how to make Do-it-yourself posi-loc's with just that....12speed brake cable.
__________________
'03 TJ Sport on 33's, 2"BB, 1"BL, 1"MML
NY94YJ is offline   Quote Quick Reply
Old 05-04-2006, 03:46 PM   #9
Jack Lives Here!!!

WF Supporting Member
 
1BLKJP's Avatar
 
Join Date: Apr 2005
Location: Phoenix, AZ
Posts: 7,764
Quote:
Originally Posted by NY94YJ
4x4 POSI-LOC in Quadratec $199.99
Damn, it's been awhile since I put one of those on a YJ, but I would bet you can find them cheaper elsewhere.

If you need one give these guys a call here in Phoenix, I am sure they can do better than 200.

www.4wheelers.com
__________________
Thanks,
Jack Hickman

President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
1BLKJP is offline   Quote Quick Reply
Old 05-04-2006, 04:14 PM   #10
Jeeper
 
NY94YJ's Avatar
 
Join Date: May 2005
Location: Malta NY
Posts: 307
Agreed.

I heard of people booty fabing it with things like peices of Garden Hose to keep the collar permanently engaged, this will work but will wear parts premature.
__________________
'03 TJ Sport on 33's, 2"BB, 1"BL, 1"MML
NY94YJ is offline   Quote Quick Reply
Old 05-05-2006, 11:29 AM   #11
Jeeper
 
yjswampthing's Avatar
 
Join Date: Feb 2006
Location: Texas
Posts: 226
Since We're on front axles, I have a few questions.

1. How strong is the D30? Some people say it is fine and that they used to put it with a V8 on the CJs. Is it stronger than the D35? (apples and oranges, I know)

2. Has anyone installed solid shafts up front to get rid of that vacuum disco?

3. I've always wanted manual lockout hubs up front so I could run a locker and save my front end parts. Anyone know what all this takes?
yjswampthing is offline   Quote Quick Reply
Old 05-05-2006, 01:46 PM   #12
Jeeper
 
dos0711's Avatar
 
Join Date: Mar 2006
Location: Northeast Florida
Posts: 400
Quote:
Originally Posted by jj33002
Thats cool, how much does one of those kits run? Where would I get it from?

Some folks make their own....

http://home.earthlink.net/~stevenschreiber/cabledis.htm

Kinda ghetto, but definitely cheaper!
__________________
Jeepless at the moment...
dos0711 is offline   Quote Quick Reply
Old 05-05-2006, 04:52 PM   #13
Jack Lives Here!!!

WF Supporting Member
 
1BLKJP's Avatar
 
Join Date: Apr 2005
Location: Phoenix, AZ
Posts: 7,764
Quote:
Originally Posted by yjswampthing
Since We're on front axles, I have a few questions.

1. How strong is the D30? Some people say it is fine and that they used to put it with a V8 on the CJs. Is it stronger than the D35? (apples and oranges, I know)

2. Has anyone installed solid shafts up front to get rid of that vacuum disco?

3. I've always wanted manual lockout hubs up front so I could run a locker and save my front end parts. Anyone know what all this takes?
Here are some answers to your questions.

1. Yes in a since it is stronger than the 35 rear. There's no C-Clip axles. The main difference is that the front axle sees considerably less force (Like 50% less) than the rear axle does. All of the forces are generally pushing on the rear. So you can get away with running more tire on the D30 without Ujoint and shaft failure. (Note, that doesn't mean you couldn't break it before you broke your 35. Everything can and will break.)

2. Yes, they do sell or can be easily made plates to seal up the disconnect and you can run TJ shafts in it.

3. Yeah, buy the Warn small hub (5x4.5) kit for like 900 bones and bingo you have locking hubs.
__________________
Thanks,
Jack Hickman

President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
1BLKJP is offline   Quote Quick Reply
Old 05-06-2006, 12:08 PM   #14
Jeeper
 
jj33002's Avatar
 
Join Date: Feb 2006
Location: Atkins, AR
Posts: 157
So if my vaccum isnt working does that mean that neither one of my front tires will pull in 4x4 or does it mean that just the passenger side wont work?
__________________
'95 wrangler, SQUARE HEADLIGHTS, 4 cyl., 5 spd., 4" superlift w/rancho rs9000 series shocks with in dash controller, 2" body lift, 35x12.5 15 tires
SureFire x300
jj33002 is offline   Quote Quick Reply
Old 05-07-2006, 04:46 AM   #15
Jeeper
 
3jeepguy's Avatar
 
Join Date: Aug 2005
Location: upstate ny
Posts: 119
if you have a locker in the front than just the passenger side won't pull but if your front is open than you won't have any front wheel action
__________________
95 yj 4.0 4 inch bds and 1.5 shackle lift 33inch swampers for summer and 32 inch mudkings for winter 8500# milemarker winch and homemade high lift / light mount on hood

|||||||
3jeepguy is offline   Quote Quick Reply
Old 05-07-2006, 09:09 PM   #16
Jeeper
 
jj33002's Avatar
 
Join Date: Feb 2006
Location: Atkins, AR
Posts: 157
I dont really understand your answer, I have a stock front axle no upgrades or anything, when I put it in 4x4 should both tires turn or just one? If just one then which one?
__________________
'95 wrangler, SQUARE HEADLIGHTS, 4 cyl., 5 spd., 4" superlift w/rancho rs9000 series shocks with in dash controller, 2" body lift, 35x12.5 15 tires
SureFire x300
jj33002 is offline   Quote Quick Reply
Old 05-07-2006, 09:53 PM   #17
Jeeper
 
3jeepguy's Avatar
 
Join Date: Aug 2005
Location: upstate ny
Posts: 119
the easiest way is to engage 4x4 mode and crawl under it with the tranny in nuetral and try to twist the front driveshaft if it moves than the front axel is not engaging
__________________
95 yj 4.0 4 inch bds and 1.5 shackle lift 33inch swampers for summer and 32 inch mudkings for winter 8500# milemarker winch and homemade high lift / light mount on hood

|||||||
3jeepguy is offline   Quote Quick Reply
Old 05-08-2006, 04:27 AM   #18
Jeeper
 
Join Date: Aug 2005
Location: Charlotte, NC
Posts: 71
Quote:
Originally Posted by jj33002
I dont really understand your answer, I have a stock front axle no upgrades or anything, when I put it in 4x4 should both tires turn or just one? If just one then which one?
If the vacuum disconnect isn't working, neither wheel will get power in your case.
__________________
99 TJ, with dents
willness33 is offline   Quote Quick Reply
Old 05-08-2006, 08:55 AM   #19
Jeeper
 
yjswampthing's Avatar
 
Join Date: Feb 2006
Location: Texas
Posts: 226
Well don't get too disheartenend. I was out muddin this weekend and thought something was weird. Sure enough, got it up on jack stands and my stupid disco isn't working. (You can tell if you put it in four and have a buddy or even yourself look under the car to see if the front driveshaft is spinning. When its off the ground, of course) Anyways I'm eventually gonna get solid shafts up there (tj style) but I think I"m gonna look into the cable shifter for now.
yjswampthing is offline   Quote Quick Reply
Old 05-08-2006, 12:36 PM   #20
Hacks off Parts while Lit
 
whitebuffalo's Avatar
 
Join Date: May 2005
Location: The Sandhills of South Texas
Posts: 2,290
Quote:
Originally Posted by dos0711
Some folks make their own....

http://home.earthlink.net/~stevenschreiber/cabledis.htm

Kinda ghetto, but definitely cheaper!
thats exactly what i did and it works pretty good on mine
__________________
'90 YJ, ford 8.8, SOA, lincoln front, aussie rear, 4.88s, swampers.
whitebuffalo is offline   Quote Quick Reply
Old 05-10-2006, 05:50 PM   #21
Newb
 
Join Date: Jun 2005
Posts: 10
im not positive but couldnt you put a xj solid shaft in place if you have on lieing around?

__________________
95 yj, 4cyl 5 speed, 4 1/2 bds lift, 33X12.50-15 on m/t classic locks, lockright in the rear, posilock with detroit ez-locker front, 9000lb tabor winch
lovsmud is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question on changing Axle Gear Ratio mbrown55 YJ Tech Forum 1 01-25-2009 04:19 PM
Axle question hedonist General Jeep Discussion 13 01-15-2008 02:27 AM
axle shaft question jeepocalypse YJ Tech Forum 14 10-04-2007 08:55 AM
trailer woes. Axle mod question cecoen Off-Topic 4 06-17-2007 12:37 AM
FS: RE-TJ/XJ front axle brackets in KS MR.CLIFFORD Classifieds Archive 0 09-13-2006 09:46 PM



» Featured Product

All times are GMT -5. The time now is 02:23 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC