Thread: Fast Front Vibration at 90 to 100 - 91 Classic.

Hi Shirl
I take it that you "broke the engine in" and all is OK
Vibrations at 90 plus K's ..... How old are the tyres??

Front< rear or whole car. Is it still there if you drop down 1 cog and ease power back on.

Well I had a friend with a vibration that nobody could diagnose.
It turned out to be the under axle bushes were stuffed and the axle was rotating on load vs no load.

It also depends how high the car is. I had one once that only happened on Righthand curves. The front prop angle just got too much and the RH spring then resonated. A bit of plastic tube over the spring damped the resonance. Thats why the big weight is under the diff on later cars.
If you have lifted the front, or removed the weight, lowering it and replacing the weight will help.
If you have greased an earlier model slip joint, you can put too much in and it collects in the bellows and unbalances the shaft.
Regards Philip A

Ahhh... This is one of those really annoying things to try & diagnose as there are so many things it could be as well as possibly being a combination of several things.

One thing that often gets overlooked is the pre-load on the swivels.

Good luck.

M

New Michelins....Mike.

New Michelins....Mike.
Truck is still NFG and goes mack in for a change of lifters.
I bit the bullet and bought a new set of RR Lifters and will get Gossie to pull the blasted Holden ones out and put them in his Holden, so to speak.....
If that doesn't work, it get a new motor! I have had enough......
Cheers,
Shirley.

I'll give it a try and let you know but it is an Auto....
Cheers,
Shirley.... OWWWWW it's gonna rev to do this - back to 2nd at 100KPH?

Originally Posted by PhilipA

Well I had a friend with a vibration that nobody could diagnose.
It turned out to be the under axle bushes were stuffed and the axle was rotating on load vs no load.

It also depends how high the car is. I had one once that only happened on Righthand curves. The front prop angle just got too much and the RH spring then resonated. A bit of plastic tube over the spring damped the resonance. Thats why the big weight is under the diff on later cars.
If you have lifted the front, or removed the weight, lowering it and replacing the weight will help.
If you have greased an earlier model slip joint, you can put too much in and it collects in the bellows and unbalances the shaft.
Regards Philip A

Hi Phillip,
Axle bushes could be suspect and you could have something with the grease prob.
There are so many things that can cause such a prob, I might take the prop shaft off first and see what happens, stip it and put new uni's in, clean out all the old grease from inside the slip joint and then refit it.
I bet it's will be the axle bushes..... Know my luck...
Cheers,
Shirley...