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Unread 11-24-2013, 12:11 PM   #1
sardog211
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1989 YJ Wrangler 
 
Join Date: Jun 2012
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YJ 8.8 driveline vibration need advice

Ok forum I am about to surrender I have a 89 YJ I6 with ax-15 and 231 with SYE, I just did an 8.8 swap I have been chasing a vibration that occurs occurs around 60 mph and up. Here's the full run down. I have a DC an XJ cut down once for the dana 35 and cut down again for the 8.8. Each time I have been told it is balanced, I had a vibration with the dana 35 installed at 68 mph with the 8.8 it's around 60mph. The other day I took rear driveshaft off an drive it with only front on wow no vibration, installed rear DS and vibration came back. I checked TC yoke this morning with and it was tight no play, I then started vehicle put it in gear and ran it yoke looked great. I also checked angles and if I did it right I have 5 degrees at yoke and 15 degrees at axle pinion. I'm simply at a loss and before I go and buy a new rear drive shaft I want to make sure I am not just wasting money trying guess what it could be. I did notice torque arm bushing was a not tight on torque arm but the transmission mount looked to be good.

I need so serious direction, do I take the driveshaft to a third place to have it checked???

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Unread 11-24-2013, 03:06 PM   #2
ashland82391
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Quote:
Originally Posted by sardog211 View Post
Ok forum I am about to surrender I have a 89 YJ I6 with ax-15 and 231 with SYE, I just did an 8.8 swap I have been chasing a vibration that occurs occurs around 60 mph and up. Here's the full run down. I have a DC an XJ cut down once for the dana 35 and cut down again for the 8.8. Each time I have been told it is balanced, I had a vibration with the dana 35 installed at 68 mph with the 8.8 it's around 60mph. The other day I took rear driveshaft off an drive it with only front on wow no vibration, installed rear DS and vibration came back. I checked TC yoke this morning with and it was tight no play, I then started vehicle put it in gear and ran it yoke looked great. I also checked angles and if I did it right I have 5 degrees at yoke and 15 degrees at axle pinion. I'm simply at a loss and before I go and buy a new rear drive shaft I want to make sure I am not just wasting money trying guess what it could be. I did notice torque arm bushing was a not tight on torque arm but the transmission mount looked to be good.

I need so serious direction, do I take the driveshaft to a third place to have it checked???
Play in the slip joint?
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Unread 11-24-2013, 03:47 PM   #3
sardog211
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No play at all I grabbed it and it's tight, everything feels good with the slip joint.
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Unread 11-24-2013, 03:50 PM   #4
ashland82391
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Originally Posted by sardog211 View Post
No play at all I grabbed it and it's tight, everything feels good with the slip joint.
Is it in park/gear when you grab it? If so try it in neutral.
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Unread 11-24-2013, 05:28 PM   #5
sardog211
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Vehicle is manual so what I did is shifted t-case to neutral spins fine I didn't feel any slop in the yoke. Thanks for your help in hoping someone hits on something I have missed.
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Unread 11-24-2013, 08:04 PM   #6
Joe Dillard
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By chance - was the drive shaft taken apart at the slip & not slid back together in-phase?
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Unread 11-24-2013, 08:15 PM   #7
TSEJEEPERS
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Measure you pinion angle and driveshaft angle like this.
http://www.stu-offroad.com/axle/pinion/pinion-1.htm
And get back to us.
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93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
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Unread 11-24-2013, 11:04 PM   #8
sardog211
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1989 YJ Wrangler 
 
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Location: Gulf Coast, Alabma
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Joe- it is in phase I did check that I have been talking to someone and since the vibration has used to be at 68 mph now it's at 60 after I shortened again for the 8.8 that it could be that my DS Is to short (17 3/4) on a xj front cut down. Thought is that it is possible that it's just hitting the right harmonics since it is short maybe I need thicker walled tubing to remove that harmonic vibration. I leaning toward getting a Curtis Tatton rear driveshaft made.


TSE- did it just like that both came out at 15 degrees on angle indicator.
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