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Unread 02-05-2013, 07:04 AM   #1
smcfar13
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Join Date: Feb 2013
Location: fort worth, texas
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quadratrac Low Range unit stuck

Good morning all and thakyou in advance.

Im slowley getting this thisng figurad out.

1977 304 quadratrac cj 7

The problem i now have is the the lowrange unit will not shift into lowrange. Ive unhooked lincage and the shift plate on the unit itself only moves about an inch. I read there should be 3 positions H-N-L mine does nothing and is alway in H. Is there a common problem when this happens??? Supost to be rebuilt but been sitting for a couple years

Thanks

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Unread 02-05-2013, 07:25 AM   #2
timgr
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1975 CJ6 
 
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Mmm... don't know of anything specific. You could ask on www.ifsja.org - there's more Quadratrac experience there.

The Quadratrac reduction unit just unbolts and comes off - no great trick to it. Take a look at the 1976 Jeep FSM here http://oljeep.com/gw/76_tsm/Section8.pdf - a '76 is the same as a '77 wrt transfer case. Note there are shifting instructions there too, that tell you how to put enoguh slack in the drivetrain so it will shift. The output shaft may have worn a little step that makes shifting difficult - you could try the Jeep shifting procedure, just to make sure. They are known to clunk due to wear on the transmission output shaft, but I don't think that will prevent shifting.

The reduction unit is pretty simple, a planetary transmission. There is a collar inside the case that slides and either locks or allows the planetary gears to turn. The previous rebuilder may have put it together wrong. I would expect it to shift easily on the bench.
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Unread 02-05-2013, 10:55 AM   #3
jumbojeepman
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1976 CJ7 
 
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The shift plate on the transfer case really doesn't move that far. You should feel two clicks when you move in either direction, as it engages the other two positions. You might want to try spinning the front output shaft back and forth a bit as you try to shift it.
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Unread 02-05-2013, 11:19 AM   #4
Dngrs1
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1979 CJ7 
 
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The low range unit does not have a neutral, only high and low. That's the way it is on my '77 J-10. Try putting the transmission in neutral and letting the vehicle roll just a bit white pulling on the lever.
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Unread 02-05-2013, 01:21 PM   #5
streetpro
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1978 CJ7 
 
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In my CJ it has a neutral. My lever only moves towards the floor about 90deg with neutral in-between.

My answer is based on a sample of 1, but my TSM illustrates it in all 78 Q-tracs.

Maybe the spline isn't lined up with the sun gear?
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Unread 02-05-2013, 01:33 PM   #6
lucdog
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From my 1978 owners manual.

Bill


image-3244709150.jpg
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Unread 02-05-2013, 06:03 PM   #7
jumbojeepman
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1976 CJ7 
 
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Yes, mine definitely has a neutral. Quite a benefit, too, as you can flat tow the Jeep in Neutral without disconnecting the driveshafts.
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