I'm still trying to get to the bottom of shuddering/vibration seeming to come from front of our 4runner. I've had the wheels balanced again (not on a stud adaptor as they only had a 5-stud one), no improvement.
In last few months,
1) all suspension ball-joints changed for new (as a pry bar test showed wear),
2) steering damper changed,
3) track-rods ends changed (highlighted in MOT as wearing),
4) idler-arm bushes changed,
5) New front shocks (milners gas - again MOT picked up)
6) new rear coil springs to cure butt sag (rear shocks fine)
I checked yesterday with front-end raised, as soon as I moved either front wheel, the steering wheel moved - so I reckon the idler arm ball-joint and pitman arm are OK.
Front end is actually about 0.3 inch lower than standard ride high quoted in manuals (of 2.3 ") - but the bump stops are well clear of suspension arms.
Tyres running about 30-33psi, have also tried as low as 28 psi - no change
basically get a shimmying/vibration above 50mph worse the faster one goes., it seems to be a lot better on smoother roads, and rough tarmac or 'coarse tarmac' defintely makes it a lot worse
It doesnt give much feedback through steering wheel, which suggests its not wheel balance problem.
The whole vehicle basically shakes, and it can be felt in pedals e.g. accelerator.
It seems to go through phases, at same speeds, getting worse then improving, whether on straights or corners. which is strange that it doesnt happen all the time - like an out of balance wheel would!
I have tried going at different revs, e.g. at 60 mph, the revs are @2300 rpm, in 5th gear, so ive tried going into 4th at same rpm, and it doesnt necessairly shake as much. - so dont think its the drive shafts or u-joints (I have greased all the u-joints.
The tyres are relatively inexpensive knobblies - camac terra 4x4 - i.e. similar tread to BFG's maybe slightly more aggressive, previous owner put them on, they were only about £50 each
Wheel bearings - N/S front slightly loose, O/S front fine - but even when I have tightened up the N/S front one, still get the vibration
any ideas - I dont want to throw anymore money at the problem, until I'm more cert whats causing it...
In last few months,
1) all suspension ball-joints changed for new (as a pry bar test showed wear),
2) steering damper changed,
3) track-rods ends changed (highlighted in MOT as wearing),
4) idler-arm bushes changed,
5) New front shocks (milners gas - again MOT picked up)
6) new rear coil springs to cure butt sag (rear shocks fine)
I checked yesterday with front-end raised, as soon as I moved either front wheel, the steering wheel moved - so I reckon the idler arm ball-joint and pitman arm are OK.
Front end is actually about 0.3 inch lower than standard ride high quoted in manuals (of 2.3 ") - but the bump stops are well clear of suspension arms.
Tyres running about 30-33psi, have also tried as low as 28 psi - no change
basically get a shimmying/vibration above 50mph worse the faster one goes., it seems to be a lot better on smoother roads, and rough tarmac or 'coarse tarmac' defintely makes it a lot worse
It doesnt give much feedback through steering wheel, which suggests its not wheel balance problem.
The whole vehicle basically shakes, and it can be felt in pedals e.g. accelerator.
It seems to go through phases, at same speeds, getting worse then improving, whether on straights or corners. which is strange that it doesnt happen all the time - like an out of balance wheel would!
I have tried going at different revs, e.g. at 60 mph, the revs are @2300 rpm, in 5th gear, so ive tried going into 4th at same rpm, and it doesnt necessairly shake as much. - so dont think its the drive shafts or u-joints (I have greased all the u-joints.
The tyres are relatively inexpensive knobblies - camac terra 4x4 - i.e. similar tread to BFG's maybe slightly more aggressive, previous owner put them on, they were only about £50 each
Wheel bearings - N/S front slightly loose, O/S front fine - but even when I have tightened up the N/S front one, still get the vibration
any ideas - I dont want to throw anymore money at the problem, until I'm more cert whats causing it...
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