double cardan at both ends of drive shaft? - JeepForum.com
 
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post #1 of 6 Old 10-15-2007, 07:52 AM Thread Starter
Vacant Stare
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double cardan at both ends of drive shaft?

I was thinking about the cascade effect of installing an SYE- adjusting the rear pinion angle, which throws the shocks, trackbar, and spring cups off, and wondered why we don't instead use a drive shaft that has a double cardan at each end and leave the rear axle where it is?

just curious.

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post #2 of 6 Old 10-15-2007, 08:32 AM
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I dont think two double cardans would work that way. It would be shaped like an " S " if you used the stock angles. They need to be angled in the same direction like an " r " to work in the way you are describing.
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post #3 of 6 Old 10-15-2007, 03:03 PM
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Tom Woods does it.

80 CJ5 in the process of a frame up resto
96% complete.
The little stuff will kill me.
On the back burner for college.
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post #4 of 6 Old 10-15-2007, 06:28 PM
mike_dippert
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i'm curious about this too. my TT and OME lift are getting closer to the top of my list, i don't really want to use adjustable arms for the reasons you listed.
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post #5 of 6 Old 10-15-2007, 10:36 PM Thread Starter
Vacant Stare
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Well I did a little research on this today, and the only reason I can find not to do it is cost. a double cardan joint does add to the cost of a custom driveshaft. I found this little blurb at the Tom Woods site:

"Multiple Double Cardan (CV) drive shafts are built using modified off the shelf components. This configuration will typically add about $180 to the cost of a more conventional CV and may require using a custom adapter flange."

So it sounds like you'd need a pinion flange for the rear axle to replace the yoke. I found one for Dana 44's for $99.

The only other possible drawback I can see is that having the pinion point forward instead of angling up toward the t-case might make it more likely to snag on things.

It's probably 'overkill' for a mild lift, but I do like the idea of avoiding all the annoyances that come with changing the pinion angle.
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post #6 of 6 Old 10-16-2007, 09:48 AM Thread Starter
Vacant Stare
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I called Tom Woods this morning to get their take on this. They brought up a few things I hadn't thought of.

Double cardan joints are longer than u-joints. On a SWB jeep, there just isn't enough driveshaft length to stuff 2 in there.

Double cardan joints are heavier than u-joints. You could end up with a drive shaft that's so heavy it's hard to balance. Not good for freeway driving.

There is a double cardan pinion yoke for Dana 44's though, so the flange wouldn't be necessary.

It's always good to talk to the experts.

Last edited by Vacant Stare; 10-16-2007 at 10:05 AM.
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