Low speed vibration
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Re: Low speed vibration (brooksman9)
OK...Something else I did while I was doing t-arms was to let the axle shafts hang. I remember now reading somewhere not to do that (after the fact of course). What kind of problem can this cause?
The universal don't have enough of a range of motion to be rotated why the wheels are hanging down. The universal hits the yoke hard on only a small spot causing the entire wheel to raise up while this area passes over the spot. This happens every rotation so the loading for just a moment is very high. If you remove the yoke and universal you will see one spot where it hits. On mine I took a round file and slight releived this area so the 1/2 shafts can be turned over without hitting.
If the car is running with the wheels hanging down the entire tire/brake assembly plus trailing arms are lifted every time this tight spots comes around.
The universal don't have enough of a range of motion to be rotated why the wheels are hanging down. The universal hits the yoke hard on only a small spot causing the entire wheel to raise up while this area passes over the spot. This happens every rotation so the loading for just a moment is very high. If you remove the yoke and universal you will see one spot where it hits. On mine I took a round file and slight releived this area so the 1/2 shafts can be turned over without hitting.
If the car is running with the wheels hanging down the entire tire/brake assembly plus trailing arms are lifted every time this tight spots comes around.
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,097
Likes: 0
From: Olive Branch MS
St. Jude Contributor
Re: Low speed vibration (19Shark69)
List everything that you have done trying to find your vibration. Sometimes we look for all the hard things and then find something simple. Did I read that you had the vibration until you kicked it into neutral? And you have an automatic, correct?
steve
steve
2. rotated tires
3. had all four tires balanced
4. replaced u-joints on drive shaft
5. replaced half shafts with new from bairs including u-joints
6. looked at motor and tranny mounts. passenger side seems to have a crack running through the rubber. waiting on replacements from volvette.
7. replaced idler arm. had 4 wheel alignment
[Modified by brooksman9, 10:50 AM 3/24/2004]
