2 Inch Lift on H2.

[OrangeCrush]

Originally Posted by tomp

Before you hit a full 3" of lift in front, you will start getting half-shaft or CV joint vibrations at 70+mph.

Tomp,

I know the Cognito UCA's are to be used in conjunction with a levelling kit but does installing the cognito UCA's allow the half-shafts not to be in a bind?


Can anyone tell me what's the difference between this and this



Thanks,

Mark

[DuckTruck]

i agree with two things thus far:

bimmer.....i WISH we had the same suspension as the H1!

and second, this thread is really bringing out some great info...lets keep it coming.

DUCK

[tomp]

Originally Posted by OrangeCrush

I know the Cognito UCA's are to be used in conjunction with a levelling kit but does installing the cognito UCA's allow the half-shafts not to be in a bind?

Can anyone tell me what's the difference between this and this

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 45.5" 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.

The difference in those two UCAs is the joint. Once has standard ball joints (but are replaceable where OEM joints are not) and the the other has uniball joints on the more expensive UCAs. These use a large steel ball for the joint and are much stronger and may last for life of H2.

[OrangeCrush]

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.

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

[timgco]

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

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.

[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?

[OrangeCrush]

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?

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

[tomp]

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.