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80 series 4" lift with vibration
Posted: Mon Jun 26, 2006 10:08 pm
by jimbo jones
I just fitted some 4" coils with caster plate's and a part time kit and now it has a vibration when you drive in 2WD
it feels like its right under your feet but its not allways there only when you cruising and you can make it go away when you tap the accelerator (spelling?). I got under and had a look and the tie rod looks really close to the front arms has any body ever come across this tipe of thing before?
Any help?
Posted: Tue Jun 27, 2006 7:08 am
by MYTTUF
My 80 did this when I added the 4 inch coils to the front and put the sway bar back on. It mainly happened when taking sweeping bends and I put it down to the limited down travel I had with the sway bar so have removed it (swaybar)and have not had the same drama since.
Jonesy
Posted: Tue Jun 27, 2006 2:35 pm
by jimbo jones
MYTTUF wrote:My 80 did this when I added the 4 inch coils to the front and put the sway bar back on. It mainly happened when taking sweeping bends and I put it down to the limited down travel I had with the sway bar so have removed it (swaybar)and have not had the same drama since.
Jonesy
I don't have a rear sway bar and I have front sway bar extontion's about 3 1/2" so I dont think its coming from the sway bars but thanks anyway.
Posted: Tue Jun 27, 2006 2:52 pm
by sniper
I thought that you only used castor plates for 6" and up lifts, and a 4" lift used correction bushes. Dont think over correction of castor would vibrate though, but im sure it would make it wonder.
Hows your uni joints?
mate of mine done a 4" lift and his uni joints died not long after.
Also what size tyres you running? big tyres kill your steering damper and you can get vibrations also from that.
Posted: Tue Jun 27, 2006 6:16 pm
by jimbo jones
sniper wrote:I thought that you only used castor plates for 6" and up lifts, and a 4" lift used correction bushes. Dont think over correction of castor would vibrate though, but im sure it would make it wonder.
Hows your uni joints?
mate of mine done a 4" lift and his uni joints died not long after.
Also what size tyres you running? big tyres kill your steering damper and you can get vibrations also from that.
caster bush's are use for 3" only 4" and up use's 5.5 deg caster plates I'm starting to think it might be the uni's in the rear tail shaft
I have a part time kit fitted so its not the front shaft.
Posted: Wed Jun 28, 2006 4:08 pm
by dow50r
Jimbo
check your driveshaft angles....if you shorten the top diff arms, it will increase the diff uni angle back to being equal. UIt will also straighten up the spriong perches...
Andrew
Posted: Wed Jun 28, 2006 4:28 pm
by sniper
jimbo jones wrote:
caster bush's are use for 3" only 4" and up use's 5.5 deg caster plates
Are you sure, i dont know anyone that runs castor plates for there 4" lift. They all run castor bushes, even BBM`s cruiser with the 4" lift runs bushes not plates.
Posted: Wed Jun 28, 2006 4:42 pm
by GRINCH
patrols run plates for most lifts over 2inchs. main reason to run plates on smaller lifts is cause the bushes flog out in no time.
Posted: Wed Jun 28, 2006 6:54 pm
by MYTTUF
sniper wrote:jimbo jones wrote:
caster bush's are use for 3" only 4" and up use's 5.5 deg caster plates
Are you sure, i dont know anyone that runs castor plates for there 4" lift. They all run castor bushes, even BBM`s cruiser with the 4" lift runs bushes not plates.
I have caster plates with a 4inch lift and if the BBM cruiser you are refering to is the one that did the Outback, it's had the front arms swapped to the top of the diff housing so it's not a real comparison.
jonesy
Posted: Wed Jun 28, 2006 7:47 pm
by sniper
Posted: Wed Jun 28, 2006 8:38 pm
by jimbo jones
If you use the of set bushes on a 4" it will tend to wander a bit with the plates it steers awsome
Posted: Wed Jun 28, 2006 8:40 pm
by jimbo jones
dow50r wrote:Jimbo
check your driveshaft angles....if you shorten the top diff arms, it will increase the diff uni angle back to being equal. UIt will also straighten up the spriong perches...
Andrew
whats a spriong perche? whats the best way to shorten the arms?