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Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

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is this possible

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Old 12-19-2008 | 09:06 AM
  #11  
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Originally Posted by Mark Doiron
Short answer: It can't be done. Not easily, anyway.

When a vehicle turns all four wheels will travel a different distance, therefore they are all rotating at a different rate (it may not seem like that, but trust me, it's true). When a permanent four-wheel drive ("full-time" or all-wheel drive, AWD) vehicle turns, the differentials in the front and rear take care of the difference between rotation speed for the left and right side. However, another differential is required between the front and rear axle. Jeeps don't have that. Even factory four-wheel drive Jeeps. Therefore, they are part-time four-wheel drive. That is, they can be used in four-wheel drive when the road surface allows the tires to slip--mud, dirt on rock, snow, etc. If four-wheel drive is engaged on dry pavement, or even wet pavement, the driver will know it every time he makes a turn--there will be loud complaining from the drivetrain and the steering wheel may even shake. What's happening is he's tearing up his driveline components, and heading for an expensive repair bill.
this is why jeep put a viscous coupling into the transfer cases for vehicles with full time 4x4. Basically the VC allows the front axle to slip while going around a turn and not bind up. So no binding, you get no shaking in the wheel or the feeling you are going to tear up the jeep. Grand cherokees have had it since 93.
Old 12-19-2008 | 09:08 AM
  #12  
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Originally Posted by Mark Doiron
When a permanent four-wheel drive ("full-time" or all-wheel drive, AWD) vehicle turns, the differentials in the front and rear take care of the difference between rotation speed for the left and right side. However, another differential is required between the front and rear axle. Jeeps don't have that. Even factory four-wheel drive Jeeps.
Hey, my KJ has a lockable center differential. Are you saying it's not a real Jeep?
Old 12-19-2008 | 09:59 AM
  #13  
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Originally Posted by cyberbrain
Now the question is why would you want to. full time 4wd sucks up gas majorly. since you are always using the front end. Also you have to worry about the viscous coupling inside the transfer. It can be burned out quite easily.
No it doesn't - my 05 WK with command-trac and a 5.7l HEMI gets great gas mileage. Way way better than my JK, and its alltime 4wd. Admittedly, part of that on the highway is MDS, but even in city it gets way better.
Old 12-19-2008 | 06:45 PM
  #14  
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I am sure the newer ones get decent mileage. I was thinking of my old 93ZJ. There was a noticable difference in milage from the full time to selectable Tcases
Old 12-19-2008 | 07:31 PM
  #15  
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Don't forget the tranny, boys. The output shaft and the extension housing on the tranny are different for 4WD. You could buy 2- yes 2 4WD jeeps for what it would cost to build one from scratch.
Old 12-20-2008 | 07:42 PM
  #16  
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i was thinking of a 06 07 cherokee salvaged. and just taking out the front end and with a install a few custom brackets the tranfser case and all but not worth the time considering it could burn without the slip
thanks
Old 12-20-2008 | 10:15 PM
  #17  
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Originally Posted by pearl-drum-man
I wonder if it would even be possible to add a Command-Trac full-time transfer case to a conversion such as the OP is looking to do?
You're on the right track, but it'd have to be the Selec-Trac 'cause the Command-Trac's were only PT cases.
Old 12-21-2008 | 07:25 AM
  #18  
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Originally Posted by MopeJK
just wondering but does anyone think its possible to do a d44 front axle on a 2wd. just making it a permanent 4wd jeep.
NO
Old 12-21-2008 | 07:54 PM
  #19  
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why not make it a 4wd, is it cheaper than a baseline 4x4 jk with parts....nope....but it would be cheaper than a rubicon......nothing against rubicons......try trading in the 2wd and upgrading you will take it in the pants over and over............as far as full time 4wd....why...i hope you are just wanting to convert from 2wd to 4wd.......


these are the basic parts to make 4wd.....i am currently driving a 4x4 and these are among the parts on my list........if i had the money i would have 60s front and rear.....but that is another list.....

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base rubicon unlimited $32,590

base model unlimited x 4x4 $22,300 out the door + atlas spd t-case $2800 + front jk dana 44 $1400 + rear rubicon dana 44 $1200 + front shaft $450 + rear drive shaft $450 = $28600 and i will still have a couple of grand to play with and still be under the price of a rubicon...........

i went the way i did, because of future plans for modifications etc...and cheaper payment....

base model unlimited x 2wd is even cheaper.........

Last edited by blkpearl; 12-21-2008 at 08:14 PM.




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