Vibration at speed

Anonymous · Post by **Anonymous** » Sun Aug 17, 08 4:20 pm

Recently I bought a 65 impala. Cars fine up to about 55mph and then I get a severe vibration (through steering and the floorpan - the whole car shakes) coming from the back at 55-60 mph, after which it starts to ease off.

I swapped a different set of wheels but to no avail

I then jacked the car up at the back and took it to 55mph while my mate was watching the wheels

- One of the rear wheels was bobbing up and down by up to 10mm.

At the same time I checked the propshaft and I get a fair bit of play at the tailshaft end (box bearing ?) - Very little by the axle. But having said that surely worn prop bearing would cause vibration at all speeds ?

Also the steering pulsates sideways when I brake hard.

Any ideas ? My prime culprit is bent axleshafts but I'm sure someone knows better.

Cheers guys

Anonymous · Post by **Anonymous** » Sun Aug 17, 08 10:38 pm

Hi Mad,
If you have a bent Half shaft the wheel will toe in and out per revolution it may have been kerbed and the end plate may be distorted/bent.
I figure that you also have a loose tail shaft bearing and at 55 the two are in harmonics and the vibration is doubling
With regard to the steering movement under braking I would suspect a warped front disc.?

Anonymous · Post by **Anonymous** » Mon Aug 18, 08 8:41 pm

Knightcharger wrote:With regard to the steering movement under braking I would suspect a warped front disc.?

Disk - what disk ?

Still, thanks for the info - it may well be the endplate or something like that - Either way I will gt a new set of halfshafts and take it from there

JohnR · Post by **JohnR** » Mon Aug 18, 08 9:02 pm

When you brake does the pedal pulse ? ie kick back if it does then your drums are out of round ,you might be able to have them skimmed ,for years I had a peculiar shake at the back of my car that at 80 was terrible found out later it was a bent flange on one axle shaft not that bent but enogh to throw it out trouble with drums is that they can warp dead easy specially leaving the h/brake when drum is hot !!

Anonymous · Post by **Anonymous** » Mon Aug 18, 08 9:37 pm

Nope - new drums at the front.

The pedal doesn't pulse and the brakes are good - The wheel simply moves sideways.

I got the rear on axle stands while Doing 55mph and the vibration persists so its deffo rear axle, wheels or drivetrain. I'm betting on the bent halfshaft flange

charger01 · Post by **charger01** » Mon Aug 18, 08 9:47 pm

Stevos Sattelite had a bad vibration Chris. Turned out to be the gearbox.

Anonymous · Post by **Anonymous** » Mon Aug 18, 08 10:01 pm

The dealer I bought the car off reckons the box had a full rebuild - I actully took the car back and made him do it, cos the shifting was rough & violent. It looks like it has new seals & tailshaft bearing. But having said that it still has play on the tailshaft

When I called him about it he reckoned that hes still got the invoice and the box is on a 12 month guarantee. I'm gonna sort out the halfshafts first and if it aint sorted I'll give him a call

NaughtyAlan · Post by **NaughtyAlan** » Tue Aug 19, 08 8:37 pm

Part ex it back where you got it from for a MOPAR or no car

Anonymous · Post by **Anonymous** » Tue Aug 19, 08 8:48 pm

Trouble is I accepted the car back after hes supposedly completed the repairs which frees him from his obligations - I should have been more thorugh when picking it up second time.

Annoying thing is I bought 2 cheapo cars off the guy before, and no problems. They I buy a dear one and he flogs me a lemon...