Vibration at high speed
08-28-2015, 10:35 AM
#1
3rd Gear
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Vibration at high speed
I have a 1965 corvette I have a vibration at high speed under acceleration it starts in third and continues to fourth and on wards if you put the car in neutral at high speed it all goes away car runs smooth.I feel it in the seat and the rear view mirror vibrates in circles .The camber bolts cam lose had excessive toe out had an alignment still vibrating.Installed new tires ,two new u joints had the drive shaft balanced also had the half shaft checked their are very good .I installed a new transmission mount.I have slight bearing play in the back wheels also were the half shaft join to the differtial 1/4 play at the spindles in the differential,also the trailing arm have slight movement were it connected to the body with shims .the movement in coming when the car is jacked up and iam holding the tire at 12 and 6 o'clock,when iam doing this I am using some force .
08-28-2015, 01:28 PM
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Vibration
I have a 1965 corvette I have a vibration at high speed under acceleration it starts in third and continues to fourth and on wards if you put the car in neutral at high speed it all goes away car runs smooth.I feel it in the seat and the rear view mirror vibrates in circles .The camber bolts cam lose had excessive toe out had an alignment still vibrating.Installed new tires ,two new u joints had the drive shaft balanced also had the half shaft checked their are very good .I installed a new transmission mount.I have slight bearing play in the back wheels also were the half shaft join to the differtial 1/4 play at the spindles in the differential,also the trailing arm have slight movement were it connected to the body with shims .the movement in coming when the car is jacked up and iam holding the tire at 12 and 6 o'clock,when iam doing this I am using some force .
08-28-2015, 02:38 PM
#3
Race Director
Check the transmission yoke and rear bushing for wear and lateral play - but taking the car out of gear at high speed probably wouldn't cause any less vibration from a worn tail shaft bushing unless the engine load is an influence.
The in/out play in the differential yokes should not be an issue. The weight of the car keeps them pressed in towards the differential.
From the way you describe the symptoms it does sound like an engine or clutch imbalance issue - but if so, you should also feel it in 1st and 2nd gear. You might look at the condition of the front differential mount bushing and U-joint angles. It could be that a U-joint angle issue will vibrate worse when under engine load than just coasting.
The in/out play in the differential yokes should not be an issue. The weight of the car keeps them pressed in towards the differential.
From the way you describe the symptoms it does sound like an engine or clutch imbalance issue - but if so, you should also feel it in 1st and 2nd gear. You might look at the condition of the front differential mount bushing and U-joint angles. It could be that a U-joint angle issue will vibrate worse when under engine load than just coasting.
08-28-2015, 05:01 PM
#4
Team Owner
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Another possible culprit is the diff nose snubber bushing - under drive torque load, the bracket wants to rise, and the U-joint can touch the floor pan tunnel if the bushings are worn or deteriorated; pushing in the clutch unloads the bracket and bushings. 
08-28-2015, 10:12 PM
#5
Le Mans Master
Good luck... GUSTO
08-29-2015, 02:14 PM
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Hi tie rod
If the vibration goes away when you slip the car in neutral then its not the driveline-its the engine. Its probably a worn clutch, warped flywheel, defective harmonic damper, bent fan blades or worse an unbalanced crank or worn bearings. Any of these problems usually show up at all engine speeds and even at idle.
08-29-2015, 02:27 PM
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65 corvette vibration issue
Check the transmission yoke and rear bushing for wear and lateral play - but taking the car out of gear at high speed probably wouldn't cause any less vibration from a worn tail shaft bushing unless the engine load is an influence.
The in/out play in the differential yokes should not be an issue. The weight of the car keeps them pressed in towards the differential.
From the way you describe the symptoms it does sound like an engine or clutch imbalance issue - but if so, you should also feel it in 1st and 2nd gear. You might look at the condition of the front differential mount bushing and U-joint angles. It could be that a U-joint angle issue will vibrate worse when under engine load than just coasting.
The in/out play in the differential yokes should not be an issue. The weight of the car keeps them pressed in towards the differential.
From the way you describe the symptoms it does sound like an engine or clutch imbalance issue - but if so, you should also feel it in 1st and 2nd gear. You might look at the condition of the front differential mount bushing and U-joint angles. It could be that a U-joint angle issue will vibrate worse when under engine load than just coasting.
