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Old 08-24-2010, 10:34 AM   #1
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MML and York On Board Air without BL?

After installing my 5.5" Rubicon Express long arm lift, 35" tires, SYE and CV driveshaft, I notice a slight driveline vibration, which I know is enough to cause parts to fail down the road. I am trying to weigh my options on how to fix this, and I am going to try the following:

1. Adjust rear UCAs to work on Pinion Angle. It looks fine right now, although I haven't measured the angle myself after the install. I had a family member's shop do the install, and they do perform awesome work.

If that doesn't work, then

2. Balance the driveshaft. It's a Tom Wood's by the way.

3. If all else fails, install a 1" MML.

The real kicker is that I do not want to add a body lift, which should be fine with the MML, but I am worried that the York 210 compressor I am looking to add for my on board air would hit the hood. My jeep has factory AC, which I will be keeping by using the Kilby KE-1000 kit I just bought. I am not sure if anyone else has dealt with this same issue, but does anyone know if the compressor will hit the hood with a 1" MML? Thanks.




Matt

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Old 08-24-2010, 11:19 AM   #2
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The DS doesn't need balancing, odds are very high that vibration is the result of nothing more than the rear pinion angle isn't quite where it needs to be.

The below illustration shows what it should look like. The pinion angle should be equal to the driveshaft angle so the pinion shaft points directly at the CV joint. Due to axle wrap (the pinion shaft pitching up 1-2 degrees during acceleration), the pinion shaft angle can be either exactly the same as the driveshaft or pointing as low as 1-2 degrees under that of the driveshaft. But the pinion shaft can't be pointing even 1 degree above that of the driveshaft.
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Old 08-24-2010, 11:24 AM   #3
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Thanks so much for that Jerry, I will take a look at that tonight. I hope that's all it is. I will let you know.
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Old 08-24-2010, 12:53 PM   #4
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P.S. I think my York OBA compressor barely cleared my hood with my 1" body lift and 1" MML. I'd check but that TJ was stolen this paste March.
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Old 08-24-2010, 01:43 PM   #5
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Good to know, thanks Jerry. Yeah, I remember when your jeep got stolen. It scares the hell out of me every day thinking about it.

Yeah, it seems like the MML would definitely be out of the question unless I did a BL. My fingers are definitely crossed now that it's just the pinion angle. 5.5" springs and a 1" BL would just be crazy, maybe shorter springs with a BL and MML, but I like the 5.5" springs without the BL.
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Old 08-24-2010, 01:49 PM   #6
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You could easily run RE's 4.5" springs with 35" tires without a body lift. I ran RE's 4.5" lift for years and with my 1" body lift I could have easily run 37" tires.

Going to a 4.5" spring with a 1" BL would then create enough room for your York while at the same time slightly reducing your TJ's COG (center of gravity) when compared to the same Jeep with all of its 5.5" height coming from a 5.5" suspension lift.
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Old 08-24-2010, 02:49 PM   #7
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Yeah, I think if it comes down to it, that I need to seriously consider this. It's kinda like the whole I've made my bed now I have to sleep in it situation. Knowing then what I know now, that would have been exactly what I would have done. For now I am going to try the simple/less expensive solutions for fixing this, otherwise it's new springs in my future.

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