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Unread 01-11-2014, 07:20 AM   #1
74FSJ
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Goodbye Quadtrac, Hello ______?

I am in the process of swapping out my Quadtrac for a 1974 Cherokee. I have recently purchased a Dana 20 that came with a TH400 adapter on it. Once I got it home, I realized that the output shaft from the factory for the TH400 is a 10 spline and much too long to be used with new adapter and transfer case. I have now read that the Dana 18 is what should be used for this conversion, as D20 binds.

Besides the Dana 18, are there other adapters and transfer case conversions that will work with the stock output shaft?

Anyone have any other option besides the Dana 18?

Any information and links to websites would be much appreciated in getting this done.

Thanks in advance,

EBM

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Unread 01-11-2014, 10:13 AM   #2
whtshos
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Another good place to ask is FSJNETWORK or browse IFSJA.
The TH400 with QT shaft is not simple to work with.
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Unread 01-11-2014, 06:57 PM   #3
jamesdart
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as far as I know, there is no other transfer case that works with the stock qt output. you have to change your output shaft. rebuild the th400 while your at it. I replaced mine with a 700r4 and dana 300.
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Unread 01-12-2014, 08:28 AM   #4
ghcoe
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You are stuck with the Quadratrac unless you want to change out the output shaft or transmission at the same time. What is wrong with the QT? It is a good solid case and has a lower final ratio than the Dana 18/20(see below). If you go to a Dana 18/20 you are going to a part time case which you can make the QT with the Mile Marker part time conversion. With the Mile Marker kit you would still have a great case, lighter and lower final drive than Dana 18/20. No other mods other than installing the kit which is easier than installing a new output shaft on that TH400.


http://www.t-r-j.com/Auto/QT/quadratrac.htm


1339 2.57:1
18 1.98:1, 2.42:1, 2.46:1
20 2.03:1
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1977 Jeep Cherokee Chief, 1972 360cid., Turbo 400 , Quadra Trac with Low Range reduction, 3:31 Gears, 31x10.5-15 GT Radial Adventuro AT II. Factory Brush Guard/Spare Tire Carrier/Safari Kit/Tow Package.
http://www.jeepforum.com/forum/f57/1...chief-1749666/
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Unread 01-12-2014, 08:59 AM   #5
CSP
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Quote:
Originally Posted by 74FSJ View Post
Besides the Dana 18, are there other adapters and transfer case conversions that will work with the stock output shaft?
If you're thinking that the Dana 18 works with the Qtrac output, that would be incorrect. As others have said you're stuck swapping the output with any other tcase.
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Unread 01-12-2014, 12:05 PM   #6
Dr. Marneaus
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Yup, you have to find yourself a D20 transmission, or a short output shaft. If your trans is fresh/good you can pull it one night, pull it apart and reassemble the next day, and then put it back up. It's a bunch of work, but just simply pulling it apart isnt all that bad or complicated.

Otherwise, q trac it is!
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Unread 01-12-2014, 12:56 PM   #7
CSP
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Originally Posted by Dr. Marneaus View Post
Yup, you have to find yourself a D20 transmission, or a short output shaft.
I'm guessing you mean a TH400 transmission that originally had a D20 behind it?
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Unread 01-12-2014, 02:11 PM   #8
Dr. Marneaus
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Quote:
Originally Posted by CSP View Post
I'm guessing you mean a TH400 transmission that originally had a D20 behind it?
correct, a transmission that was bolted to a D20.
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Unread 01-12-2014, 06:29 PM   #9
SBpunk
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Not to mention finding a new rear axle that doesnt have the off set
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Unread 01-12-2014, 06:31 PM   #10
jamesdart
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technically, couldn't you get any 4wd t400, like from a chevy? something like out of an 80s fs chevy, pull the output shaft from the trans and use the adapter and transfer case. 208, 203, 205, 241, as long as it has a mechanical speedo and passenger side drop.
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Unread 01-12-2014, 07:03 PM   #11
CSP
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Not to mention finding a new rear axle that doesnt have the off set
That's really not an issue with the FSJ's because of the length of the rear driveshaft. The angles stay well within the usable operating angles of the ujoints.
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Unread 01-12-2014, 07:18 PM   #12
jamesdart
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i drove and wheeled mine all year with centered output d300 and the offset rear 44 no vibes, it cruises pretty good on the highway too. 75-80 no prob.
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Unread 01-13-2014, 03:09 PM   #13
Dr. Marneaus
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Quote:
Originally Posted by CSP View Post
That's really not an issue with the FSJ's because of the length of the rear driveshaft. The angles stay well within the usable operating angles of the ujoints.
Quote:
Originally Posted by jamesdart View Post
i drove and wheeled mine all year with centered output d300 and the offset rear 44 no vibes, it cruises pretty good on the highway too. 75-80 no prob.
Yeah. I am running a Qtrack rear end with a stock D20 centered output. I get minor minor vibes on the highway under load, but am pretty sure it's more to do with the driveshaft being 100% extended than anything else. Also, i'm lifted a good 4", which obviously exacerbates any potential issues.
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Unread 01-21-2014, 10:28 PM   #14
runningonempty
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Ok guys, I'm a bit thick so bear with me. I have a '75 and '76 wag., stock. What you guys are saying is that there isn't a replacment for the QT, correct? The only change would be a milemarker part time kit, right? Okay how about the tranny? Could I keep the qt, but change the tranny to something like a GM-700 4 or 5 speed? Or how about a 4 speed manual? No way jose?
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Unread 01-22-2014, 10:16 AM   #15
CSP
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You can adapt many transmissions to accept the Quadratrac transfer case. There are none that it will bolt directly up to, and likewise there are no other transfer cases that will bolt directly up to the transmission that you have.

Look in the knowledge base link at www.novakadapt.com for specifics.
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