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Unread 04-04-2008, 12:11 PM   #1
jsealey
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2003 TJ Wrangler 
 
Join Date: Sep 2007
Location: Ontario Canada
Posts: 74
Driveshaft angles and vibration

I've installed a 2" BB on my Rubicon and have had an increase in vibration. It had a slight vibration before the lift and it got worse after. I have installed new tires (the reason for the lift) and that made no diference. I adjusted the toe as it was way out after the lift and I put some washers as spacers on the skid plate for the T-case. Last night I borrowed a digital protracter from work and measured my driveshaft angles. With the skid plate shimmed 3/8" the drive shaft measured 12 degrees the T-case output 5 and the pinion 7.
The manual says operating angles should be less than 3deg. mine are 12-5=7 and 12-7=5 cancellation should be within 1 deg. mine is 7-5=2 deg. Without the shims the driveshaft angle is 14 deg. this increases the operating angles to 9 and 7. Would a 1" mml fix this problem?

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2003 Rubicon energy suspension 1" BL, Skyjacker 2" BB, 255\85r16 Bfg MT, Hurst shifter
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Unread 04-04-2008, 12:21 PM   #2
TJ_with_Tusks
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Join Date: Feb 2005
Location: Medford, MA
Posts: 515
if the vibes are from the rear make sure that the rear diff is at the exact same angle as the rear driveshaft. it they are from the front, get an aftermarket stering shock. You might also want to look into getting a motor mount lift and body lift instead if the tcase drop. It looks better, works better, and doesnt kill your ground clearance.
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04' Columbia TJ
33" BFG AT's, OME HD lift, front airbag suspension, teralow 4:1 kit & supershort shaft kit, TW CV shaft, 4.10 gears, JKS body lift, track bars and quicker disconects, Warn 9.5ti, warn front bumper, garvin wilderness rack, and solid cast aluminum tusks,
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Unread 04-04-2008, 12:45 PM   #3
quiksilverj
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2005 TJ Wrangler 
 
Join Date: Dec 2007
Location: virginia
Posts: 159
guy at the local jeep shop told me to set my pinion about 1 degree below my driveshaft angle so that when you are on the gas the angle is in line. no vibes if that helps any?
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Unread 04-04-2008, 01:10 PM   #4
jsealey
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2003 TJ Wrangler 
 
Join Date: Sep 2007
Location: Ontario Canada
Posts: 74
Are factory specifications like I quoted from the fsm the rule or just a guideline?
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2003 Rubicon energy suspension 1" BL, Skyjacker 2" BB, 255\85r16 Bfg MT, Hurst shifter
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