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Unread 11-27-2011, 11:52 AM   #1
sf_indiana
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Difference in Front Axles

1999 Cherokee Laredo.
Does anyone know the differences between full time and part time front axles in the 1999 Cherokee, length diameter ans so on excluding track-loc and vari-loc?
This is related to this post.

http://www.jeepforum.com/forum/f310/.../#post12569393

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Unread 11-27-2011, 11:57 AM   #2
BigBeefy
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The full time and part time refers to the transfer case. in part time the TC locks front and rear drive shafts together. In fulltime, the drive shafts are not locked together.
I am not aware of a full time and part time axle.
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Unread 11-27-2011, 12:01 PM   #3
speedjunky1
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I hope that this is the help you need. I just changed one of mine yesterday. 2000 4.7 GC Select Trac. The Vari-loc axle are about an inch longer and both are 27 spline.
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Unread 11-27-2011, 01:15 PM   #4
sf_indiana
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To further explain Advance Auto lists axles for "full time" and "part time". That is where the terminology came from. There must be a difference between the select-trac (part time) and quadra- trac (full time).

Mine is full time, I have been speculating someone may have put a shorter axle in it, renderer the front differential inoperative.
It would be nice to know the difference in axles and what effect it would have putting the part time( select-trac) axle in a full time (quadra- trac) application.
I won't be able to work on it till later this week so I am exploring some possibilities.
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Unread 11-27-2011, 01:24 PM   #5
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No there is a difference between Quaddra-Trac and Quaddra Drive axles. On the QD models, there are Vari-lok axles, which as speedjunkie mentioned are about an inch longer.

I would think if the wrong axles were put in (too short of an axle) that it would just drop in the tube rather than sit in the differential.
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Unread 11-27-2011, 04:57 PM   #6
sf_indiana
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How about select-trac are they shorter or longer than Quadra-trac?
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Unread 11-27-2011, 07:13 PM   #7
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They are the same. Only the vari-loc axles are different length. Lets answer this a few more times.
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Unread 11-27-2011, 07:17 PM   #8
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Smile

Quote:
Originally Posted by WiCkeDuDe View Post
They are the same. Only the vari-loc axles are different length. Lets answer this a few more times.
LMFAO!!!
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Unread 11-27-2011, 10:16 PM   #9
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Very well put!!
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Unread 11-28-2011, 02:24 AM   #10
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Without any mention of selec-trac I don't think it was answered.
Thanks for your warm welcome the the forum!
According the parts listing @ Advanced Auto there is a difference. Could it be the number of splines then?

At the bottom of this post the guy talks about getting vari-loc shafts and installing them only to strip the end off. That does not sound possible if it were too long but rather too short. There is plenty of information on this forum , but it is not all in agreement.
http://www.jeepforum.com/forum/f310/...blems-1143074/

Last edited by sf_indiana; 11-28-2011 at 03:16 AM..
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Unread 11-28-2011, 05:05 AM   #11
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There are two axles put in WJs. A Dana 30 with an open differential and one with varilok. The varilok is only found in vehicles that have a Quadradrive system. All others have the open diffs.
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Unread 11-28-2011, 07:46 AM   #12
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Let me answer because I got caught with this dilemma last weekend. I'm assuming that Advance Auto uses a computer system similar to Autozone's (where I got caught). If so, then the computer or online system only gives you the choice of "part-time" or "full-time" when selecting front axle shafts (aside from drive-side or passenger-side). The problem is they don't differentiate between the two full-time systems of Quadra Trac II (open diffs) and Quadra Drive (Vari-lock).

The axle shafts for Vari-lock (listed in the computer as the "full-time" axles) are 1" longer than then axles for open diffs (listed as "part-time" axles, but also are used in the Quadra Trac II WJ's).

If you have Select Trac or Quadra Trac, then the axles sold are either the correct length or 1" too long. There is no way you could have the proper Jeep WJ CV axle shafts that are too short.

If I remember correctly, the passenger side axle shaft for a non-Vari-lock WJ is 40 1/8" long.

Edit: I also read through the link you provided. If you are referring to the last poster in that thread, I'm suspect of what he mentioned. If he tried to install Vari-lock axles in a open diff then there's no way the bearing would have bolted back on.

Last edited by HLawton; 11-28-2011 at 07:56 AM..
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Unread 11-28-2011, 08:04 AM   #13
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I've got a passenger side shaft at home from a Quadradrive with Vari-lok that I will measure later this evening. I bought mine from autozone.com and if I remember right they list W/Vari-loks and W/O on the website.
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Unread 11-28-2011, 04:47 PM   #14
sf_indiana
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I had a chance to pull off my differential cover and found that the left axle did not turn the spider gears. I could see the end of the axle on the right side but could not see the end of the axle on the left side. This means it has broke and came out of the gear (which I doubt) or it was too short to engage the gear. It would seem there is not enough room for it to break and then side out past the remaining shaft, but I could be wrong.
It's weird, but like I said someone has had it apart before and who knows what was installed. I'll try to get the axle out before I go the the parts store, I want to know for sure what is going on.
Thanks for your help guy and for the sarcastic remarks, well I hope you enjoy looking like jerks.

Last edited by sf_indiana; 11-28-2011 at 04:58 PM..
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Unread 11-28-2011, 06:22 PM   #15
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You need command-trac axle shafts.
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