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post #1 of (permalink) Old 05-06-2012, 02:34 AM Thread Starter
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79 qtrac front double cardan CV

Need a new double cardan for my front driveshaft on my 79 cj7 with Quadratrac. Thought about rebuild, would like to go pick up a spare from a jy to have on hand. Need to know what would be a good donor vehicle. Will take to driveshaft shop to shorten if need be. Any one know where to find the rebuild parts off hand. Just need the ball centering kit.
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post #2 of (permalink) Old 05-06-2012, 05:10 AM
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I didn't realize the Q-Tracs had a CV joint in the front shaft. The CJ7s with D20 case had a single cardan joint at each end with a slip joint at the T-case.

Will is our resident Q-Trac expert - he can tell you everything you want to know about them and a good deal more. As for a donor for a spare, there probably aren't many possibilities. Measure yours for length and go to a pick-and-pull. Anything as long or longer with the right-size joint and small diameter tube will work. It's the small diameter tube that will make donors scarce. You may have to build one up from parts.

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post #3 of (permalink) Old 05-06-2012, 07:24 AM
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Bronco II.....
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post #4 of (permalink) Old 05-07-2012, 09:37 PM
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No need for junk yard parts. Parts stores carry the two u-joints (they are normal u-joints) and the centering ball kit. Might have to go to NAPA, I know they have it. The only reason to look for another drive shaft is if your joint went bad and broke something or your long skinny tube is bent or twisted. Any spicer style cv-joint driveshaft will work when re-tubed. Look for a full size jeep with a 2" or larger tube.

But, if your shaft is good, just replace the joints and centering ball.

"As the circle of my knowledge grows, so grows the circumference of the unknown." - Isaak Newton
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post #5 of (permalink) Old 05-07-2012, 10:38 PM Thread Starter
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Found the kit and already have the ujoints for mine, just wanted a trail spare. Seen a few bust out there, thought it would be nice to just replace it and go if it did go out. Thanks for the info though, will have to go see what I can find.
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post #6 of (permalink) Old 05-08-2012, 06:06 PM
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The joints are pretty reliable. I've never had a trail failure. I have twisted the skinny driveshaft tube however. That is why I went to a larger tube at that time. Now I have a 700r4 transmission. I don't have room for a CV joint and have to run a single u-joint.

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post #7 of (permalink) Old 05-14-2012, 12:16 PM
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I shoulda paid more attention to your location.

My go to Jeep guy is Ron Istas at Inland Truck Parts. out on Parvin Road 816-471-3154.

I ran across Ron in the late 80s but his history with my Jeep goes back further than that, his name was written on the cover of the Chiltons manual given to me by the previous owner.

Hes a jeeper, very knowledgeable about Jeeps and in particular drivetrain.

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Those who understand binary and those who don't.
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post #8 of (permalink) Old 05-19-2012, 09:59 AM Thread Starter
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Thanks Taz. I will definitely get ahold of Ron and the guys at Inland in the future. I did rebuild my CV yesterday. Went pretty well. I now officially have all the U-joints replaced throughout the entire rig. Drivetrain is now solid and I don't have any fear of breakage, on or off road. At least not from worn parts anyway.
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