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  #1  
Old June 7th, 2007, 11:59 PM
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shane cates
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drive shaft

we are not smart enough here to balance a drive shaft. help please
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  #2  
Old June 8th, 2007, 12:22 AM
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Buck
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Take it to a drive line co. The only way to do it at home is to toss it in the air, whichever side lands first is the heavy side. Take a little off with a grinder and toss it again. Keep doing this untill the drive shaft lands perfectly flat. Then its balanced.











Just take it to a drive line company.
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  #3  
Old June 8th, 2007, 09:03 AM
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David Marchand
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That was pretty creative.
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  #4  
Old June 8th, 2007, 08:23 PM
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shane cates
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not driveshaft after all. At speed, no vibration when I push the clutch in or let it coast in neutral. Seems a bit coincidental that this transpired at exactly the same time I installed the new lift. I have it parked now until I come up with the problem. Your help would be greatly appreciated.
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Old June 10th, 2007, 02:55 PM
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shane cates
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bump
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  #6  
Old June 10th, 2007, 09:09 PM
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How much lift?

Stock driveshaft?
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  #7  
Old June 10th, 2007, 10:03 PM
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shane cates
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had 2" blocks. put on full 3" rovertym setup. Lengthened rear drive shaft and had it balanced. Had the vibration before and after the driveshaft work. Same problem with the front shaft removed. Vibration is a little worse on acceleration vs. slowing. It appears only above about 20-25mph. In neutral or clutch engaged there is no problem. drive shaft should be spinning regardless if in gear or not when moving. I can't figure it out. Thanks for you input.
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  #8  
Old June 10th, 2007, 10:33 PM
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Peter Sherman
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Quote:
Originally Posted by huck1974
had 2" blocks. put on full 3" rovertym setup. Lengthened rear drive shaft and had it balanced. Had the vibration before and after the driveshaft work. Same problem with the front shaft removed. Vibration is a little worse on acceleration vs. slowing. It appears only above about 20-25mph. In neutral or clutch engaged there is no problem. drive shaft should be spinning regardless if in gear or not when moving. I can't figure it out. Thanks for you input.
What kind of shafts do you have? Dc front?
the angle of the diff makes a huge differance...angle finder is the tool...
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  #9  
Old June 11th, 2007, 02:53 AM
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nate
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so you have a vibration, but what exactly are the syptoms? is it only durring certain speeds above 25mph, or more prominant under certain conditions? Do only feel it in particular gears? Do you feel the vibration in the steering wheel, the gas, or the tranny? What tires are you running?

I was chasing a vibration and went through all the motions with the drivetrain and it ended up being my tires horribly out of balance. It was particularly bad in the 30-40 mph range, and then would run smooth between 40-65 or so, and then would start vibrating again above 65.
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  #10  
Old June 11th, 2007, 02:22 PM
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shane cates
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at any speed above 25 in any gear. Does it with or without front shaft on. Does not do it in neutral at any speed. That would eliminate the tire possibility and the front driveshaft. The angle of the rear is not great, but no worse than with the other lift setup. The driveshaft is still turning while coasting in neutral and there is no vibration. It seems slighly worse on accel. It is still there doing consistant speed. Is completely gone at any speed in neutral. I had the rear shaft lenghtened a bit and trued and balanced. same problem. If it is the driveshaft, it should vibrate some whether in gear or not while moving. Am I missing something here??

I'm beating my head against the wall on this one.
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  #11  
Old June 11th, 2007, 02:32 PM
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maybe your yoke/pinion shaft bearings are loose in your rear diff (the part the rear driveshaft attaches to at the bottom). sounds like it happens only under load, at a specific harmonic range, in the rear shaft. Disconnect the rear shaft at the bottom and shake it to see if there is excess play. if it's not the shaft, i can't think of anyting else with this particular set of symptoms.

good luck.
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  #12  
Old June 11th, 2007, 07:43 PM
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Peter Sherman
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if the input doesn't match the output youll have vibs. perhaps loading the shaft causes more vibs
also the shaft could be out of LR phase! the uj's should not be in phase. [if you dig]
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