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  #1  
Old 02-21-2018, 10:31 AM
tbrasse tbrasse is offline
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79 Cherokee-Quadratrac to Dana 20 with Novak

If I decide to do the swap, I am sure there is a thread I am missing here. Send a link if you have it handy. I'd like to read it. I am most worried about the driveshaft angle to the passenger-offset Dana 44 in the back (do I have to change the rear axle? vibrations? driveshaft cut and weld?), the transmission support member that exists now (will it work?), whether the linkage I'd buy from Novak will interfere with the underdash A/c or anything else inside and all the little "stuff" that will annoy me until I make it look and function like it came that way from the factory. My QT will need a full overhaulin and chain, diaphragm for the shifter, etc, and I am going to rebuild the turbo 400 so if I am ever going to change, this is the time. Twin stick Dana 20 would be pretty awesome and I love the surety of shifting the transfer case as opposed to the twist and pray operation of the QT. I do have the hubs already as I have the part time kit in the 1339 QT installed.

Finally, from those who have this setup, any regrets?

Thanks in advance.
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1979 Cherokee Chief (rebuild project) in Morocco Tan
360, Turbo400
3 inch spring lift, dealer installed brush guard and rear spare carrier/Jerry can holder thingy

1979 Golden Eagle Cherokee parts truck.
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  #2  
Old 02-21-2018, 10:45 AM
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TPICherokee TPICherokee is offline
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If the rig in your signature is the rig you are doing this to, the driveshaft angle would be the same as stock.

On the widetrack Cherokee, Jeep used the same rear axle for the Dana 20 and the Quadratrac.
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1979 Cherokee Chief - 6-inch BJ's Off-Road Lift Kit, TPI Chev 350, 700R4 with NP208 and 4.56 gears, 35x12.50R17, Rhino Front End, J-Truck Rear Axle, GoMango Orange.
1967 M715 - 454 Chevy, TH400, 1100R16 Michelin XZL Tires, Stock otherwise
1996 Suburban Cummins 6BT Swap
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  #3  
Old 02-21-2018, 01:41 PM
tbrasse tbrasse is offline
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Quote:
Originally Posted by TPICherokee
If the rig in your signature is the rig you are doing this to, the driveshaft angle would be the same as stock.

On the widetrack Cherokee, Jeep used the same rear axle for the Dana 20 and the Quadratrac.

My rig has a passenger side offset rear axle and the Dana 20 looks like it has a centered rear output, meaning the driveshaft would be down and to side a little with a Dana 20, right? Maybe I am wrong here, as I am fairly new to the FSJ community and learning.
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1979 Cherokee Chief (rebuild project) in Morocco Tan
360, Turbo400
3 inch spring lift, dealer installed brush guard and rear spare carrier/Jerry can holder thingy

1979 Golden Eagle Cherokee parts truck.
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  #4  
Old 02-21-2018, 02:47 PM
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rang-a-stang rang-a-stang is offline
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I have been doing lots of research here lately looking at Xfer case options because I am planning out a 4 speed swap. There are quite a few threads on here of people that have changed cases from QT to center outputs and staying with PS offset rear axle with no ill effect. I have read posts from people that have 1000's of miles on their rig and they say no vibes, no unusual wearing of U-joints. That angle is not much different from the angles your U-joints would see if you had a 6" lift.

I say swap and don't think another thing of it!
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  #5  
Old 02-21-2018, 03:10 PM
joe joe is offline
 
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Quote:
Originally Posted by TPICherokee
If the rig in your signature is the rig you are doing this to, the driveshaft angle would be the same as stock.

On the widetrack Cherokee, Jeep used the same rear axle for the Dana 20 and the Quadratrac.
x2
Same axle, same diff offset.
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Old 02-21-2018, 08:29 PM
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J20 project J20 project is offline
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Quit worrying about the rear axle..it will work.
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  #7  
Old 02-21-2018, 08:36 PM
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TPICherokee TPICherokee is offline
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Quote:
Originally Posted by tbrasse
My rig has a passenger side offset rear axle and the Dana 20 looks like it has a centered rear output, meaning the driveshaft would be down and to side a little with a Dana 20, right? Maybe I am wrong here, as I am fairly new to the FSJ community and learning.

Learning is good, this is a very common misconception.

The ONLY vehicle to receive a different rear axle with a Dana 20 as opposed to a QT was a narrow track FSJ (Wagoneer or narrow track Cherokee).

The widetrack Cherokee used the same axle with a QT and with a Dana 20

The JTruck used the same rear axle with a QT and with a Dana 20

Hope this helps
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www.bjsoffroad.com - BJ's Off-Road - Your Full-Size Jeeps Parts Specialist
1979 Cherokee Chief - 6-inch BJ's Off-Road Lift Kit, TPI Chev 350, 700R4 with NP208 and 4.56 gears, 35x12.50R17, Rhino Front End, J-Truck Rear Axle, GoMango Orange.
1967 M715 - 454 Chevy, TH400, 1100R16 Michelin XZL Tires, Stock otherwise
1996 Suburban Cummins 6BT Swap
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  #8  
Old 02-23-2018, 06:36 AM
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Heavy_Metal_Thunder_81 Heavy_Metal_Thunder_81 is offline
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No issues with drive line angle here. Figuring out a cross member mount is fun, though. As no FSJ after '74 came with a TH400 and Dana 20, none of the existing holes line up so, you need to get a bit creative.

Any regrets? Yea, I wish I would have just stayed with the QT.
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1979 Cherokee Golden Eagle - 7" lift, 35x12.5x15
AMC 360 - 4180, TFI, Headers, Dual Exhaust
TH400 - Shift Kit, Deep Pan, Aux Cooler
D20 - Twin Stick'd
F D44 - 4.10, Eaton E-Locker
R D44 - 4.10, Detroit Locker

1979 Cherokee Chief - Parts
1979 Cherokee Chief - Parts
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1981 Cherokee Chief - Cubed
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  #9  
Old 02-23-2018, 09:04 AM
tbrasse tbrasse is offline
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Quote:
Originally Posted by Heavy_Metal_Thunder_81
No issues with drive line angle here. Figuring out a cross member mount is fun, though. As no FSJ after '74 came with a TH400 and Dana 20, none of the existing holes line up so, you need to get a bit creative.

Any regrets? Yea, I wish I would have just stayed with the QT.

OK after much debate, tons of searching on forums for previous attempts and a cost study, I am staying QT. I have enough parts to keep it going without anything other than a gasket set and a chain (which I can get USA made).
So, staying QT. Now, should I get the overdrive chain for the 16%?!?
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1979 Cherokee Chief (rebuild project) in Morocco Tan
360, Turbo400
3 inch spring lift, dealer installed brush guard and rear spare carrier/Jerry can holder thingy

1979 Golden Eagle Cherokee parts truck.
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  #10  
Old 02-23-2018, 09:14 AM
joe joe is offline
 
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Quote:
Originally Posted by tbrasse
So, staying QT. Now, should I get the overdrive chain for the 16%?!?
I'm only on my 2nd cup of coffee so sorry I don't get the question. Which MM part-time conversion kit do you have?
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Old 02-23-2018, 09:40 AM
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tgreese tgreese is offline
 
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Yes - you need more than the chain to go overdrive, sp. different diameter sprockets. Do you have the Mile Marker kit?
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  #12  
Old 02-23-2018, 11:30 AM
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rang-a-stang rang-a-stang is offline
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Quote:
Originally Posted by Heavy_Metal_Thunder_81
...I wish I would have just stayed with the QT.
WOW! I have never seen those words assembled into a sentence! I don't have an opinion one way or the other, but so many people have bad mouthed the QT over the time I have been here, I thought I was the only one planning to stay MM QT for the long haul. Hm.


tbrasse, Keep in mind the chain for the OD kit and the standard chain are different. You said you have access to a USA made chain, make sure your kit matches the chain. It would suck if you bought an overdrive MM kit and had a standard chain...
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  #13  
Old 02-23-2018, 02:28 PM
tbrasse tbrasse is offline
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Quote:
Originally Posted by rang-a-stang
WOW! I have never seen those words assembled into a sentence! I don't have an opinion one way or the other, but so many people have bad mouthed the QT over the time I have been here, I thought I was the only one planning to stay MM QT for the long haul. Hm.


tbrasse, Keep in mind the chain for the OD kit and the standard chain are different. You said you have access to a USA made chain, make sure your kit matches the chain. It would suck if you bought an overdrive MM kit and had a standard chain...

I do have the MM Kit. I'll have to count the links I guess as I have NO idea what kit it is. I assume if it is not the overdrive kit I could order a new sprocket and appropriate chain and rock on.
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1979 Cherokee Chief (rebuild project) in Morocco Tan
360, Turbo400
3 inch spring lift, dealer installed brush guard and rear spare carrier/Jerry can holder thingy

1979 Golden Eagle Cherokee parts truck.
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  #14  
Old 02-23-2018, 04:38 PM
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rang-a-stang rang-a-stang is offline
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The MM instructions say the OD sprocket has 41 teeth and the Non-OD sprocket at 49. I would count sprocket teeth AND links. One case I bought had gnarly slop in the chain because it was an OD sprocket with a standard chain.

If it turns out you need to buy a chain, might be easier and cheaper to buy this, instead.
http://www.ifsja.org/forums/vb/showthread.php?t=184460

That's kind of what I did: I bought an entire case with a good chain in it. That way I was able to tinker on it, get it tweaked the way I wanted it, then just swapped cases. Then I put my old case on Craigslist (and the forums here) and sold it. I say "sold" because there is a guy that said he is going to pick it up, but he hasn't yet.
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  #15  
Old 02-23-2018, 06:35 PM
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How long before you go up in time size?
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