Steering Vibration

[Makaveli]

Occasionally when I'm driving on the motorway around 100km/h in a straight line without braking I get vibration in the steering. I believe I have been experiencing this since I had my steering rack and pump rebuilt. I had wheel balancing and wheel alignment done with Brand new tyres. Wheels/Tyres are bigger than stock. 235/40R18 Front and 265/35R18 Rear (no spacers). The car is 1996 Celsior. Also steering is hard at parking speeds. I have been told by Toyota this is due to the size of my tyres. But I don't think I had this problem before getting the steering rack and pump rebuilt.

What can cause this? I think it might be with something not being assembled correctly in the rack? Any thoughts? Main worry for me is the vibration on the motorway

Thank You

[jakesae101]

normally thats a bad wheel alignment issue

[Makaveli]

It has been aligned by Toyota North Shore like twice and also once by Bridgestone when they changed the tyres. So I am not sure what's left to do.

[jakesae101]

checked suspension bushings for play?

[Makaveli]

No I havent, but got a VTNZ WOF like two weeks ago. Do they check?

[jakesae101]

to a degree they do

[Makaveli]

Can it be caused by steering rack itself?

[jakesae101]

not generally unless it hasnt been tightend properly or the bush has failed allowing the rack itself to move

[CelicaGT8]

Wheel balence, ball joints, top hats on struts warn, rack ends, tie rod ends, brake discs warped, loose caliper, to name a few... Take your pick

[Scottie]

dose the centre bore of the wheels fit snug on the hub.

[Makaveli]

I will have a look at it. But maybe its the rotors. Probably just need them machined.

[ROBODISCO_20v]

Have you had your front shocks checked? I think the shock shop i.e. Wairau suspension still do free inspections.
When they're stuffed they can send a nasty vibration through the steering. Had that problem on my 86.