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01-25-2009, 04:14 PM
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Hummer Guru
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Join Date: Oct 2005
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Re: 2 Inch Lift on H2.
Quote:
Originally Posted by tomp
Mark, no - the Cognito UCAs don't circumvent the issue with the half shafts. I know the height I provided with 37s works with no CV vibrations at 70+mph. Prior to being at 44.5" from ground to bottom of fender flare, I was at 55.5" and it vibrated at 70mph at that height so you could try something in between to see if you can get more that 44.5" height using 37s.
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Well I guess that leaves me screwed. I'm only at 42.5" and running 35's and at 70mph, I can feel the halfshafts making a minor vibration.
I guess my only choice is to lower the front end a bit to relieve some of the bind the halfshaft is getting and replace the rear 1 1/2" spacer in the rear with perhaps a 1" spacer.
Any other suggestions?
Thanks,
Mark
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01-25-2009, 05:14 PM
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Re: 2 Inch Lift on H2.
Quote:
Originally Posted by OrangeCrush
Well I guess that leaves me screwed. I'm only at 42.5" and running 35's and at 70mph, I can feel the halfshafts making a minor vibration.
I guess my only choice is to lower the front end a bit to relieve some of the bind the halfshaft is getting and replace the rear 1 1/2" spacer in the rear with perhaps a 1" spacer.
Any other suggestions?
Thanks,
Mark
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Could this possibly be an alignment issue casing your vibes? Or maybe the Cognito UCA's will help? Not sure as I haven;t doen these mods yet. I think the most accurate way to measure would be from teh center of the hub to the bottom of the fender well.
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01-25-2009, 06:27 PM
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Re: 2 Inch Lift on H2.
Mark, I dont think they will vibrate with front height that low. Something is not right. You can count number of "flats" while turning down TBS and see if it goes away - and if that was not it turn the TBs back up exact same number of flats. Make sure to have load off of front end when cranking them up or down. Also, jack each front wheel off ground and grab tire/wheel and try to lift and ot shake the wheel to check for bad hub bearings.. You could also check air pressure and balancing and did you get an alignment after cranking TBs?
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H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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01-25-2009, 06:58 PM
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Hummer Guru
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Join Date: Oct 2005
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Re: 2 Inch Lift on H2.
Quote:
Originally Posted by tomp
Mark, I dont think they will vibrate with front height that low. Something is not right. You can count number of "flats" while turning down TBS and see if it goes away - and if that was not it turn the TBs back up exact same number of flats. Make sure to have load off of front end when cranking them up or down. Also, jack each front wheel off ground and grab tire/wheel and try to lift and ot shake the wheel to check for bad hub bearings.. You could also check air pressure and balancing and did you get an alignment after cranking TBs?
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Tomp,
Thanks man, I'll double check the air pressure. Tire balancing and pressure should be right since they were brand new when I did the lift. (like I said, I'll double check) The steering wheel doesn't vibrate at all at any speed so I'm assuming the balance of the tires is fine.
As far as alignment, I immediately had an alignment done. I even had them use the specs the manufacturer suggested.
I took a look at the front halfshafts and they shouldn't be in a bind. Like I said, the vibration is VERY minor.
I'll check pressure next.
Mark
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01-25-2009, 08:35 PM
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Re: 2 Inch Lift on H2.
Mark...do you have mud tires with large lugs on them? This will cause it
Edit: just went back to see your pics and "yes" that is caused by those tires. It's the lugs you are feeling so no worries there. I bet if you put your stock tires back on for testing, the issue would not occur. I had Mickey Thompson Baja Claw Radials which are close to the same pattern as those tires you have and they did the same thing. It shouldn't be that bad though. I would have them re-check balancing to make sure it's right. Tell them is vibrating really bad.
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H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
Last edited by tomp : 01-25-2009 at 08:39 PM.
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01-26-2009, 12:41 AM
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Hummer Guru
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Join Date: Oct 2005
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Re: 2 Inch Lift on H2.
Thanks, I've got a set of stock tires I can try. Like I said, the vibration is MINOR but I tend to be anal.
I ordered a set of cognito UCA last night but thinking I should cancel the order.
However, it should make the truck ride better. (it's not bad now, I can hardly tell any difference) but I'm more interested in ride quality as far as when the suspension loads and unloads as you go over wavy roads.
Mark
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01-26-2009, 02:13 AM
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Hummer Authority
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Join Date: Sep 2005
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Re: 2 Inch Lift on H2.
Mark, longer shocks are more of a priority than the UCAs. The shocks are the first limiting factor and then second are the control arms.
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H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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