4wd, Front Axle - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 04-29-2011, 04:10 PM   #1
Jeeper
 
Join Date: Mar 2011
Location: NC
Posts: 39
4wd, Front Axle

Ok, so my 4lo/hi engage, but only on the rear axle. Front and rear drive shafts turn but no 4 anything on the front axle. No wheel hop when turning on pavement, no grabbing when going up hills, etc...

So after seeing (eyes on it while my wife drove) the front drive shaft is rotating (because it doesn't when in 2 wd, and is when in 4 wd) I assume it must be something in the front axle. I have checked the pneumatic lines running from the pump to the axle and all is good there. What else could it be, the pump itself, the engaging mechanism in the front axle?

Need to fix it soon, will be wheeling down at the beach (supposed to be) in one week. Thanks in advance for any input. It's an 87 YJ 4.2, stock drivetrain and axles. Yes I checked the linkeage and all is good there.

__________________
'87 YJ/OME Suspension/31x10.50/1200wt PI/Onbaord Air/BCT Trunked Scanner/Congo Basket w/ Pull Out Awning - tons more yet to do.

OEF/OIF/HOA Veteran

"Thank you to all those that served and those that still are!"
Dursky is offline   Quote Quick Reply
Old 04-29-2011, 04:18 PM   #2
Jeeper
 
Irongrave's Avatar
 
Join Date: Apr 2011
Location: Erie, PA
Posts: 2,800
Send a message via AIM to Irongrave
CAD system sucks, get a cable system like a posi lock or something like that or get a block off plate a new inner axle seal and a set of shafts from a late model XJ, or TJ as those have the bigger u-joints

__________________
4421
Irongrave is offline   Quote Quick Reply
Old 04-29-2011, 04:20 PM   #3
Jeeper
 
Join Date: Mar 2011
Location: NC
Posts: 39
One more thing...

Oh yeah my 4wd light doesn't come on in the dash either. I'm on a super limited budget, but yes I would like to go to a cable system eventually.
__________________
'87 YJ/OME Suspension/31x10.50/1200wt PI/Onbaord Air/BCT Trunked Scanner/Congo Basket w/ Pull Out Awning - tons more yet to do.

OEF/OIF/HOA Veteran

"Thank you to all those that served and those that still are!"
Dursky is offline   Quote Quick Reply
Old 04-29-2011, 04:28 PM   #4
Jeeper
 
Matcheen's Avatar
 
Join Date: Apr 2010
Location: Aurora, ON, Canada
Posts: 421
Images: 1
Probably the vac motor on the front axel. You can: 1, replace it and hope for the best. 2, buy a posi-lock and get rid of the vac. 3, perma lock the coupling with a spring or a perma-lock set up. Or 4, replace the shaft with a TJ axel shaft.

Personnally I went for the spring engage set up. Cheap, easy, efficient, just do a search on the forum, there' lots of info.
__________________
You're never to old to have toys!
'90 YJ, 4" RC Suspension lift, 1" Shackle lift, SYE and CV, Holley Carb, 33/12.50/15 Dynapro M/T's. RIP my old friend.
Matcheen is offline   Quote Quick Reply
Old 04-29-2011, 04:36 PM   #5
Jeeper
 
Join Date: Mar 2011
Location: NC
Posts: 39
how cheap

Matcheen,
How cheap are you talking, ballpark estimate?

Eventually I'd like to pull a set of rubicon axles from a junk yard and sap in but that's for later on down the road.
__________________
'87 YJ/OME Suspension/31x10.50/1200wt PI/Onbaord Air/BCT Trunked Scanner/Congo Basket w/ Pull Out Awning - tons more yet to do.

OEF/OIF/HOA Veteran

"Thank you to all those that served and those that still are!"
Dursky is offline   Quote Quick Reply
Old 04-29-2011, 10:33 PM   #6
Jeeper
 
NAVYCHIEF's Avatar
 
Join Date: Sep 2008
Posts: 2,207
spring setup around $1.20.
__________________
1994 RENEGADE

TREAT EVERY STRESSFUL SITUATION AS A DOG WOULD.
IF YOU CAN'T EAT IT OR PLAY WITH IT,
JUST PEE ON IT AND WALK AWAY.
NAVYCHIEF is offline   Quote Quick Reply
Old 04-30-2011, 06:37 PM   #7
Jeeper
 
Join Date: Mar 2011
Location: NC
Posts: 39
ok...so....

"Squid", huhum, I mean NAVYCHIEF, I found the thread about the spring install, sounds great, but how bad of a hit will my mpg take on average by doing th espring conversion? I'm getting 17.1-19.2 (depends on the driving that week) right now. It's a DD and Overlander.
__________________
'87 YJ/OME Suspension/31x10.50/1200wt PI/Onbaord Air/BCT Trunked Scanner/Congo Basket w/ Pull Out Awning - tons more yet to do.

OEF/OIF/HOA Veteran

"Thank you to all those that served and those that still are!"
Dursky is offline   Quote Quick Reply
Old 04-30-2011, 08:57 PM   #8
Jeeper
 
Matcheen's Avatar
 
Join Date: Apr 2010
Location: Aurora, ON, Canada
Posts: 421
Images: 1
Quote:
Originally Posted by NAVYCHIEF View Post
spring setup around $1.20.
$1.20 and about an hour or two of your time.

It shouldn't affect your MPG same set up as the TJ, and....How the heck are you getting that kind of MPG!?!?
__________________
You're never to old to have toys!
'90 YJ, 4" RC Suspension lift, 1" Shackle lift, SYE and CV, Holley Carb, 33/12.50/15 Dynapro M/T's. RIP my old friend.
Matcheen is offline   Quote Quick Reply
Old 04-30-2011, 10:19 PM   #9
Jeeper
 
NAVYCHIEF's Avatar
 
Join Date: Sep 2008
Posts: 2,207
WHATTYA MEAN SQUID? LOL i did mine two years ago. no notice of any mpg change.
__________________
1994 RENEGADE

TREAT EVERY STRESSFUL SITUATION AS A DOG WOULD.
IF YOU CAN'T EAT IT OR PLAY WITH IT,
JUST PEE ON IT AND WALK AWAY.
NAVYCHIEF is offline   Quote Quick Reply
Old 05-01-2011, 08:51 AM   #10
Jeeper
 
jakec's Avatar
 
Join Date: Jan 2011
Location: Cantonment, Fla
Posts: 189
i engaged mine with a couple tywraps and its been doin fine going on a year or so. i had a posi lock and it sucked too dont waste your money. i just pulled the shift fork out, slid the coupler over to engage it, and put two tywraps on each side to hold it there.
jakec is offline   Quote Quick Reply
Old 05-02-2011, 10:05 AM   #11
Jeeper
 
Join Date: Mar 2011
Location: NC
Posts: 39
Mpg

Quote:
Originally Posted by Matcheen View Post
$1.20 and about an hour or two of your time.

It shouldn't affect your MPG same set up as the TJ, and....How the heck are you getting that kind of MPG!?!?

Matcheen,
I have spent countless hours tinkering with the carb (Zennith) and have all my emissions stuff disconnected. I'm running 31x10.50, and skinny tires make a difference IMO on mpg. When these wear out I'll go 33x10.50's. Additionally, everything has Mobil 1 synthetic fluids, oil, tranny, etc.. Prolongs the life and makes a difference IMP.

Plus I'm very throttle weary, not too much at one time, kind of eak out as many miles as gently as possible (that all goes out the window when wheeling), and I don't run my roof rack on it unless I need it (wind resistance). I'll draft behind 18 wheelers on the highway, and go into neutral when going down sizeable hills.

I gotta make every penny count now that I'm back in college and not working. After graduation and a new job I'll get crazy with the Jeep then.

Just filled up this morning and I avg'd 17.1333... on this last tank.

__________________
'87 YJ/OME Suspension/31x10.50/1200wt PI/Onbaord Air/BCT Trunked Scanner/Congo Basket w/ Pull Out Awning - tons more yet to do.

OEF/OIF/HOA Veteran

"Thank you to all those that served and those that still are!"
Dursky 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
Front axle u-joint removal Beer30 TJ General Discussion Forum 18 06-11-2014 02:55 PM
4WD Vaccum System On Front Axle 92 YJ Rubicon YJ Tech Forum 1 10-27-2010 01:40 AM
Front Axle help for a new guy rrwhite13 TJ Tech Forum 3 01-29-2010 10:35 PM
Cant get front axle to engage yj4x4 YJ Tech Forum 6 09-01-2009 11:53 AM
Remove Front Axle Shafts ? nicolas-eric TJ Tech Forum 4 05-08-2008 07:11 PM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 05:51 PM.



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