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Unread 11-16-2012, 10:58 AM   #1
jt_armstrong
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1994 ZJ 
 
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ZJ Drive Train Help Please

I bought my '94 ZJ on Monday and took today off work to give it a general once over. After jacking up the front, I noticed both front wheels spin Despite this being my 5th Jeep it is my first with "always on" 4 wheel drive.
A quick check showed that the front drive shaft was missing. I also have a receipt from Jan '12 for the fitting of a new front diff. I am assuming both are linked. My questions:-

1)How does the Jeep manage the 4x4 function? Is it with a viscous coupling similar to the P38 Range Rovers?
2) How can I test the transfer box with a front drive shaft missing?
3) What damage will be caused if I continue to run it with only the rear wheels driving?
4) I also noticed that both front CV rubber boots are split. Is there a way to test the CV?

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Unread 11-16-2012, 11:57 AM   #2
ratmonkey
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1 yes
2 can't
3 no more damage as its all been done. The coupler is already ruined by driving even a short time with no shaft.
4 replace the axle shafts

Before putting a new drive shaft in, verify the front gear ratio matches the rear.
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 11-16-2012, 12:42 PM   #3
jt_armstrong
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Quote:
Originally Posted by ratmonkey View Post
1 yes
2 can't
3 no more damage as its all been done. The coupler is already ruined by driving even a short time with no shaft.
4 replace the axle shafts

Before putting a new drive shaft in, verify the front gear ratio matches the rear.
Thanks ratmonkey. Is there a recommended manufacturer for the replacment axle shafts?
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Unread 11-16-2012, 11:21 PM   #4
jt_armstrong
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OK, so I spent the afternoon wrestling with the hub nuts. What a PITA. Nothing i have will shift these wee rascals. I have a 2 foot breaker bar and even with all my 220lbs standing on the end of the bar it still wont budge. What else can i do? Will a manual impact driver help or do i just need to find a bigger breaker bar?
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Unread 11-16-2012, 11:30 PM   #5
nicklopic
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Soak it in PB blaster over night and try it again In the morning
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98' Grand Cherokee 4.0, 3" lift (2" BB and upcountry springs) 32" BFG All-Terrains
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Unread 11-17-2012, 12:13 AM   #6
jt_armstrong
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Soak it in PB blaster over night and try it again In the morning
Done. Fingers crossed tomorrow will bring more sucess.
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Unread 11-17-2012, 01:43 AM   #7
Gr8Hondo
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Quote:
Originally Posted by jt_armstrong
OK, so I spent the afternoon wrestling with the hub nuts. What a PITA. Nothing i have will shift these wee rascals. I have a 2 foot breaker bar and even with all my 220lbs standing on the end of the bar it still wont budge. What else can i do? Will a manual impact driver help or do i just need to find a bigger breaker bar?
Brace your breaker bar on a jack and use the jack to do the back breaking job!
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Unread 11-17-2012, 04:43 AM   #8
nicklopic
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Goodluck man!
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98' Grand Cherokee 4.0, 3" lift (2" BB and upcountry springs) 32" BFG All-Terrains
Aluminum Rad, Hella 500ff's, Cobra CB, 102" whip, IRO exhaust, Super 40 Magnaflow Cat, Kenwood deck, Kicker DS65 speakers, Sony Xplod amp, Kicker Comp10s in a sealed box
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Unread 11-17-2012, 12:40 PM   #9
jt_armstrong
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Quote:
Originally Posted by Gr8Hondo View Post
Brace your breaker bar on a jack and use the jack to do the back breaking job!
Tried this heard the loud crack and thought success - unfortunetly it was my breaker bar that made the crack as the end shered off.
I think its time to throw in the towel and get a local garage to do this.
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Unread 11-17-2012, 12:52 PM   #10
ratmonkey
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usually any impact method will take it off pretty easily.
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Unread 11-17-2012, 01:30 PM   #11
jt_armstrong
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Originally Posted by ratmonkey View Post
usually any impact method will take it off pretty easily.
Would one of those manual impact drivers work? Lisle do one that claims to deliver 200 foot/lbs of shock torque. Amazon have it on offer for $30.

One last thing - just for sh1ts and giggles - tell me hub nut isnt a left hand thread.....
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Unread 11-17-2012, 02:25 PM   #12
ratmonkey
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it's standard thread.
they get seized pretty good. first one i ever did i needed to get it cherry red hot before it broke loose with a good 1/2" drive impact gun.

i was thinking get a good breaker bar and a decent 3lb brass hammer for the manual impact actually. lol
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Unread 11-21-2012, 08:55 PM   #13
jt_armstrong
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Success at last. Borrowed a mates battery powered impact driver and it whipped the nut off like it wasnt torqued up. I think i will be investing in one of these on black friday..Thanks for all your help and suggestions.
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