What is a CV shaft and why do I want one? - Page 5 - JeepForum.com

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post #61 of 158 Old 11-17-2009, 08:33 PM
Smittyman
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Sweet job man! Breakin it down for the everyday man


Patriot Blue Y2K XJ. Big plans, small wallet.
http://www.jeepforum.com/forum/f22/00-xj-sport-daily-driver-build-thread-908084-new/
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post #62 of 158 Old 01-06-2010, 07:10 PM Thread Starter
Unlimited04
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whew, thats for the props guys...that was a lot of info to gather!

Diablo, feel free to link this where ever, or maybe an admin will move it someplace else.

I'll link it in my sig along with all my other write-ups and i'll suggest it in the TJ Tech Boot Camp thread.

I think most of that is correct, but it has been a long day...so if you see any glaring inaccuracies please let me know and i'll correct them.

Last edited by Unlimited04; 02-07-2010 at 09:29 AM.
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post #63 of 158 Old 01-14-2010, 11:36 AM
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i may somehow incorporate this info into my sophmore design class

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post #64 of 158 Old 01-14-2010, 06:19 PM
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Nice... stupendous...
C.
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post #65 of 158 Old 01-14-2010, 06:31 PM Thread Starter
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post #66 of 158 Old 01-14-2010, 06:36 PM
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GREAT work Unlimited04!
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post #67 of 158 Old 01-14-2010, 07:23 PM
mightydog78
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ahhh, another M.E.
are you a M.E. too? im in my sophmore year at UNC-Charlotte

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post #68 of 158 Old 01-14-2010, 07:40 PM
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finishing an M.S.M.E now...PhD is probably next
haha very nice dude!! i had thought about going for that too. What university?

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post #69 of 158 Old 03-27-2010, 04:33 PM
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great info
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post #70 of 158 Old 03-31-2010, 06:28 AM
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Bravo! I've always had an understanding but this was a gap filler for sure. It sure is a shame the Thompson design is only good up to 2,500 RPM. It would be so perfect for vehicle applications.

Man's got to know his limits.
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post #71 of 158 Old 04-13-2010, 01:14 PM
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Gonna bump this because of the great info. My first time reading this fully and it helped me understand alot how vibes affect other things than just u joints and why I need an SYE with my small 2 inch lift. When he says that every Jeep is different, he is right. I had to have a 1 inch t case drop and still had slight vibes. The MML worked fine until I needed to change u joints then those slight vibes came back. Every jeep IS different.
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post #72 of 158 Old 05-11-2010, 07:57 AM
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Very interesting Now I Know Thanks Excellent write upl
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post #73 of 158 Old 05-11-2010, 09:40 AM
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Congrats! Excellent job!
Here's my question: I have a 4.5" lift with around 1.5" coil spacers. I have a SYE kit installed from Rubicon Express with a CV shaft from Tom Woods. I took care of my driveline angles as per your drawings above, but I STILL get vibrations though the seat when I'm around 1900-2100 RPM on a highway. Should I point my pinion towards the centerline of the t-case OUTPUT or towards the double cardan?
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post #74 of 158 Old 05-11-2010, 12:37 PM Thread Starter
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Congrats! Excellent job!
Here's my question: I have a 4.5" lift with around 1.5" coil spacers. I have a SYE kit installed from Rubicon Express with a CV shaft from Tom Woods. I took care of my driveline angles as per your drawings above, but I STILL get vibrations though the seat when I'm around 1900-2100 RPM on a highway. Should I point my pinion towards the centerline of the t-case OUTPUT or towards the double cardan?
the pinion should be at the same angle as the driveshaft. i.e. driveshaft centerline should be the same as the pinion centerline.

that should automatically set where the double cardan lands.

keep in mind with a SWB TJ & high lifts, you CAN run into the limit of a standard SYE...thats why JB conversions sells the SuperShort SYE. some say this limit around 6-8" of lift, depending how your getting that lift (TT, MML, SL, etc).

Assuming your RE SYE is really the RE Hack'N Tap, it's actually slightly longer than a fixed yoke SYE, like the Advance Adapters or the JB Conversions SuperShort SYE. Meaning you're more likely to run into vibes at very tall lifts.

But there are other factors that could the problem. Rear tire balance, out of round tire, bent rim, driveshaft balance, pinion or flange nut not torqued properly, motor mounts, trans mount, etc.
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post #75 of 158 Old 05-12-2010, 12:27 AM
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Originally Posted by Unlimited04 View Post
But there are other factors that could the problem. Rear tire balance, out of round tire, bent rim, driveshaft balance, pinion or flange nut not torqued properly, motor mounts, trans mount, etc.
I doubt it's wheel/tire balance issue because when I remove my foot from the accelerator the vibes stop. The driveshaft is brand new from Tom Woods (vibs were noticed on my first and second test drive so under 50 miles on it). I now have to check motor/trans mounts but I don't see how that would be the problem since the vibration frequency is high (rubber mounts would dampen the frequency). Anyway, I'll check my alignment again, probably take the shaft for balancing and recheck my mounts. I can't think of anything else...
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