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Unread 02-11-2008, 04:07 PM   #1
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2005 LJ Wrangler 
Join Date: Feb 2008
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CJ7 CV Drive Shaft?

I'm new to the site but have found some very helpful information here so hopefully someone has some ideas for me.

I have a '85 CJ7 I just put a RE 4.5" lift on. The whole time I was crossing my fingers that the drive shaft wouldn't bind once I was finished. After everything was said and done (with 2.5* shims added in the rear) the u-joint at the transfer case doesn't bind....but just barely.

Is it possible to use steeper shims to adjust the pinion angle to help correct this temporarily? I'm assuming I'll have to put on a CV drive shaft, but would like to avoid it as long as I can.

Also, I've done numerous searches on this site but haven't found a "how-to" on what used CV drive shaft components I can use or what to look out for.

Thanks in advance for all the help and keep rockin'.

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Unread 02-11-2008, 05:07 PM   #2
WTF is that?
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1984 CJ7 
Join Date: May 2006
Location: Brandon, MS
Posts: 1,441
Read this. More than I could even begin to tell you,.
1984 CJ 7, SBC 350TBI, 700R4, D 300, AMC 20, D30, 35" Mickeys, 3.54 Gears, 4" susp. Lift, 2" body lift.

AMC 20 Write Up
In Progress - 4.56 gears, Aussie Rear Locker, Moser 1 Piece Axles
Coming Soon - CV Shafts, Welded Tubes, trusses
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Unread 02-11-2008, 07:09 PM   #3
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1980 CJ5 
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You could try larger shims but they may induce a driveline vibe. Might have to play around with shims and a transfer case drop to get the vibration cancelled out. Also, be aware that, although not binding, steep ujoint angles drastically reduce ujoint life. Another thing to be careful of.. if you're close to binding at static ride height, you really need to be careful about "unloading" the rear suspension (ie bouncing over a speed bump). That could droop the rear suspension enough to cause binding.. no warning.. just a bang.

Some folks (me included) grind the yokes to help keep from binding.

Your average stock ujoint will go farther before binding than a typical CV shaft will. However, with the CV you can rotate the pinion up further to reduce that angle. Also, the CV will split the angle between 2 joints.. usually extending ujoint life over a single joint.
'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..

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Lower 2


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Unread 02-12-2008, 08:06 AM   #4
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2007 CJ7 
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When I did mine I put shims on the rear and got a Double Cardan Conversion driveshaft from http://www.4xshaft.com/index.html It has worked flawless.
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Unread 02-13-2008, 07:20 PM   #5
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Looks like a new CV shaft is in my future. Anyone out there have a used one they'd be willing to part with?
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Unread 02-13-2008, 09:46 PM   #6
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