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Discussion Starter · #1 ·
What's the deal with Quadratrac anyway???

Seems that people like to bag on the Quadratrac system.
I know 2 guys who run it on their V8 CJ-7s and beat snot out of them on the trail. They haven't had any problems related to the Quadratrac system.
The guy at the local 4x4 shop says "...why swap something in that didn't work right in the first place?" ..he wouldn't go into detail, just said "You don't want it." He is usually right when Jeep is the subject, but I still wonder - Why?

I understand it is a fulltime 4x4 system which kills fuel economy and that the earlier versions used cones in the center differential which weren't very smooth. ...And it requires the AMC 20 rear axle which people also love to hate (I guess some *did* have offset 1pc D44s).
sure the t/c is aluminum cased and chain drive, but so is the NP231 in YJ/TJ...

why does Quadratrac get such a bad rap? I'm not taking about Helldorado or the Rubicon. That kind of use is extreme. I'm talking about a Great Lakes area Jeep on something like 32s that runs around town sometimes and runs around on mild trails (the kind where 4wd is needed most of the time not constantly plus a winch) with mud, rocks, trees, sand & gravel sometimes.

Whaddaya think?



 
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What do I think??....I think you pretty much described my jeep and the way I use it..I run a stock 258 with a moderate lift..have the winch, for those times when nothing else will do, and narrow track swampers. The Quadratrac I use has the reduction unit and is coupled to a TH400. I've been driving a Quadratrac ever since I bought my first one fresh off the lot in 1979. I've heard people slam them from time to time, but it doesn't matter. The Quadratrac does its job and as far as I'm concerned does it well. That being said; I agree with Brad, the reduction unit makes the difference, I wouldn't want a Quadratrac without it.

DrummondCJ
 
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I have already put in a centered rear diff for the swap of my QTrac to a d300 & tf727. I bled the brakes on the newly installed centered diff. rear and then drove around for an hour with the front pulling just fine. No driveshaft to the rear. For whatever reason I just HAD to have something other than the th400 & QTrac. - Got a great used one if you need another..

 
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I've got the quadratrac with the low range unit and I've never regreted it at all. My Jeep has been in the family since 1979 so I know the history of it and there has never been a problem with the transfer case. I suppose I should replace the chain some day and the lubricant for it is a little pricey, but other then that it has been a great unit.

 

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/wwwthreads_images/icons/smile.gif A few years ago when we went looking for a base platform on which to build the ultimate SNOJEEP, we basically had two choices: A new/wwwthreads_images/icons/shocked.gif TJ and swap in the NV242 transfer case, or we could go way back to a '76-'79 CJ-7 with the Quadra-Trac system./wwwthreads_images/icons/smile.gif For snow driving; especially up here in the steep country; you want all wheels driving equally, and all wheels slowing equally on decelleration;/wwwthreads_images/icons/tongue.gif AND.....and this is the biggie......each wheel needs to go a different speed if needed. So that means an open-center differential in the transfer case, like our ZJ with the NV242 has. The big drawback to QTs is the cone clutch setup. Because of those cones, the QT's are stubborn about going into lockup when you need it; and because of the cones, tire size and tire matching is critical; and because of those cones, you must use a special fluid. So........we disabled the cones in a simple machining operation, and the result was a transfer case which works WITH YOU, not AGAINST YOU. We also moved the vacuum switch to a convenient place on the dash; instead of having it buried in the back of the glove box; and we devised a tricky indicator lamp system which shows Jeepchick which mode the case is in. Green=Open, Yellow=In the process of shifting, Red=Locked. Jeepchick can flip the vacuum switch and do lazy figure eights until the yellow lamp goes out and red appears. A great many......like almost all of them... QTs that I have inspected show the effects of incomplete shifting. The collar never made it all the way to lockup, and then the case will POP out of lock when power is heavily applied, and the cussing begins. Keeping the chain fresh seems to be an important theme to prevent the destruction of the case from a broken chain wadding up under the driven sprocket and grenading the case. THE TRUTH IS......a QT has the highest shaft-to-shaft efficiency of all the early cases if you are in direct drive. HOWEVER, the cones and the tire mismatch that is usually present on QT Jeeps shoots down any previously gained efficiency. People often mistake the low efficiency of the TH400 tranny for what they think is QT-caused low efficiency./wwwthreads_images/icons/frown.gif The truth is, that together, the TH400/QT combination DOES suck up fuel, but it doesn't have to be that way, if you disable those cones. Our SNOJEEP doesn't have the low range, simply because we didn't happen to need one. The TH400 is beefy enough to pull at low enough speeds for snow work, and we really don't do any rock climbing./wwwthreads_images/icons/smile.gif The low range units just add to the slack in the drive system so since we really didn't need one, we didn't install one./wwwthreads_images/icons/smile.gif My crack moonguy Quadra-Trac team is on standby,/wwwthreads_images/icons/wink.gif and ready to leave at a moments notice. They can modify your case in the supermarket parking lot while you go in for a suitcase of Bud light./wwwthreads_images/icons/crazy.gif/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/laugh.gif/wwwthreads_images/icons/cool.gif

CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
 

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I really like the quadratrac as well. On the street I drive around with the transfer case locked and the hubs unlocked. Off road I have can drive with the transfer case and hubs locked like everyone else. What I think is an advantage is I can also unlock the transfer case and have all four wheels being driven but let the front and rear turn the different speeds they need to. This beats either unlocking a hub or shifting the transfer case into rear wheel drive only to turn corners with the dual lockers in the axles. It also still works surprisingly well in the snow. I was driving around with the hubs locked and the transfer case unlocked and it worked just fine.



79/CJ-7/AMC360/TH400/Q-TRAC/d30/d44/33's/RS9000s/Herculiner/Pro-jection 2D/MSD/4.10s/lockrights
 
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Well I'm willing to bet that most of the QT bashing is from people who just want to brag on there all gear case. I have a QT that I rebuilt and put a Part time conversion kit in, verry pricy. Then I put one piece axles, new gears, posi unit and disc breaks on the 20. In all a verry expensive bunch of mods, about 3000. If you think about it, that is a rediculas propisition when you consider the price of a rebuilt dana 300 and a shortened dana 60 rear out of an old pick up truck with lockers and disc breaks allready on it. about 1000. O well expensive lesson! Once decided on the QT your limited I belive on what you can bolt up to it transmission wise, if you stick with the turbo 400 (great xmsn)you cant put an overdrive in it. I guess it all depends on your outlook if you have a QT that is working and dont plan on upgrading the QT and the rear and it will fit your needs than keep it. I have a 78 CJ7 ground up restored AMC 360 turbo 400 QT and AMC 20 Rear. Ive put about $18,000.00 in and would definatly do it different. Chevy 350 torqueflight 727 dana 300 dana 60 rear at half the price stronger and plenty of parts availability no upgrades required. Whats realy bad is a guy told me all this 4 years ago. I guess the smart thing to do is to consider JEEP FEVER you will always want bigger stronger stompier stuff and the QT in my opinion limits your options and pinches your wallet. jim.

(JEEP LAW) 4 modifications per application
 

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I got around the AMC20 with the quadratrac by using a wagoneer dana 44 that also had the quadratrac. That with a widetrac dana 30 seems to be ok for me. If I were to build another jeep the only thing I would do different is instead of putting in the widetrac dana 30, I would have put in the dana 44 front from the same wagoneer. We'll see how long this front end lasts as is.



79/CJ-7/AMC360/TH400/Q-TRAC/d30/d44/33's/RS9000s/Herculiner/Pro-jection 2D/MSD/4.10s/lockrights
 
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Will,
How did that mod go.. did you encounter anything unusal when you put in the waggie rear end?....I just bought a Quadratrac wagoneer and intend on doing the same thing as you have,,,well, I'll use both the front and rear out of the waggie. I've been wanting to do so for awhile now, I was simply waiting till the fellow who had it dropped his price to something I thought was reasonable...Now that he has, .I figured I couldn't go very wrong by only paying $25.00 for sound running wagoneer. Anyway,,,,,whatever insite you can pass along would be well received.

DrummondCJ
 

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/wwwthreads_images/icons/smile.gif WILL...... you should be driving with ONE front hub unlocked, and change from one side to the other in odd and even months. If you do that, there is no chance of wasting the spider gears in the front differential./wwwthreads_images/icons/crazy.gif With both hubs unlocked, unless the resistance is exactly perfect side to side, one axle will sit there while the other turns and the spider gears are turning...turning...turning....turning./wwwthreads_images/icons/crazy.gif

CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
 

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I have swapped two wagoneer rears in and they both were easy. The spring pads do not need to be removed but the stock shock mounts do. I used a grinder to grind the welds and then hammered them off. The brake lines are the same just wider. You'll have to get some new line but it will bolt in. (3/16") I hooked up my vent hose to the axles fitting and bolted the brake lines down with the original hold downs. The only thing I didn't do was hook up the e-brake but it would hook up the same as the cj. (my cable on the drivers side isn't long enough with the lift.)

To set the spring pads, I just measured the angle of the pads and pinion on the axle I removed and then transfered this measurement to the new one.

As for unlocking one hub versus two, I have a lockright in the front so I need to unlock both or be in three wheel drive and bind the transfer case.

79/CJ-7/AMC360/TH400/Q-TRAC/d30/d44/33's/RS9000s/Herculiner/Pro-jection 2D/MSD/4.10s/lockrights
 

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/wwwthreads_images/icons/blush.gif Oops! I should have read your by-line a little closer. With a lock rite the spiders will not be doing the creepy crawly, no way./wwwthreads_images/icons/blush.gif

CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
 

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Discussion Starter · #14 ·
Re: quadratrac (thanks)

Thanks for the insight. Much appreciated.
The root of my question is that my CJ-7 has terminal rust in the frame. I've cut, hacked, patched and repaired much of it but the rust will return, no doubt. I have a couple years of life, here in the rust belt, left in the frame but I need to decide - make some serious repairs to this Jeep or find another for project.
Meanwhile... in my search for axle parts I found a '76 Cherokee the guy said I could have. Body is lost cause but it is supposed to be complete w/360 and quadratrac. Not sure about much yet, it sits behind a barn and is overgrown by trees & brush.
Might be a fun project for conversion to a CJ-8. Plus I could tinker on it and not have the pressure of needing it to drive to work the next day.
I'll get over and check it out more closely.
More to come...
 
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The reason the Quad gets such a bad rap is that it sucks in full size jeeps. The Cherokees and Wagoneers were just too heavy. The average engine in a full size is the 360 which produced just a little too much torque. In a fullsize the chain lasts about 30,000 miles before it starts skipping. In a little CJ with a 258 or 304 the quad is no problem.

 

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I had a beater full size '79 cherokee chief on 35"s a few years ago with the quadratrac. It was damn near unstoppable. I couldn't get to the low range, cuz the stupid dial-selector thingy in the back of the glovebox (what the hell was jeep thinking with that???) was broken, but that rig tromped all over everything till the day the 360 exploded and took my hood with it. After that, it didn't 'wheel so well anymore. heh

 

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The dial in the glovebox isn't for the low range, it's the transfer case differential lock. The low range (if it had one) had a purely mechanical lever on the side of the trans hump in front of the drivers seat.

79/CJ-7/AMC360/TH400/Q-TRAC/d30/d44/33's/RS9000s/Herculiner/Pro-jection 2D/MSD/4.10s/lockrights
 

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/wwwthreads_images/icons/laugh.gif I just love it when stuff is misinterpreted/misunderstood./wwwthreads_images/icons/laugh.gif Heaven forbid that anyone should get a Haynes and actually read through it!/wwwthreads_images/icons/smile.gif I had a tough time explaining to Jeepchick what "Emergency Drive" actually was./wwwthreads_images/icons/wink.gif I finally said that it "Yolked Up" the front and rear axles.....that seemed to be the best description, and she grasped the concept OK. "Emergency Drive" somehow doesn't really give the correct impression./wwwthreads_images/icons/tongue.gif Our CJ has the cones disabled, so theoretically you can have just one of the four wheels in an icy spot and the Jeep could just sit there spinning./wwwthreads_images/icons/tongue.gif With the cones disabled, it pops right into lock-up.....ALL THE WAY into lockup......with no hesitation./wwwthreads_images/icons/smile.gif

CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
 
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