Wierd Vibration - Bearings, Ujoints, clutch?
02-15-2011, 07:07 PM
#1
Drifting
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Wierd Vibration - Bearings, Ujoints, clutch?
'89 6-speed 147K (just replaced clutch 1K miles ago w/ stage 2 spec)- When I stomp it, its smooth and then around like 3500 to 4K RPM's I get this vibration. It's not too violent but enough to make me let off the throttle. Today I accelerated and then let the gas off at 4K and the vibration happened again when letting it off.
I have suspected either my rear bearings or U-joints are bad and have some play because around 90 I get a mild vibration and a steady wAAaaawAAaaa sound in a pulse. Then if I hit like 120 it seems to be the same vibration I get at lower accel speeds.
The thing is the low speed one is inconsistent, and maybe happens 1 out of ever 4 accelerations and sometimes on 1st, sometimes on 2nd, 3rd, usually not in 4th.
Also I was wondering if holding the shifter into gear would cause something like this (ie, keeping pressure back when in second, forward in 3rd). I have this habit from my dune bug cause it pops out of gear and I find myself doing it on my vette if I'm not paying attention.
I have suspected either my rear bearings or U-joints are bad and have some play because around 90 I get a mild vibration and a steady wAAaaawAAaaa sound in a pulse. Then if I hit like 120 it seems to be the same vibration I get at lower accel speeds.
The thing is the low speed one is inconsistent, and maybe happens 1 out of ever 4 accelerations and sometimes on 1st, sometimes on 2nd, 3rd, usually not in 4th.
Also I was wondering if holding the shifter into gear would cause something like this (ie, keeping pressure back when in second, forward in 3rd). I have this habit from my dune bug cause it pops out of gear and I find myself doing it on my vette if I'm not paying attention.
Last edited by rithsleeper; 02-17-2011 at 11:51 PM.
02-16-2011, 09:16 AM
#2
Drifting
'98 6-speed 147K (just replaced clutch 1K miles ago w/ stage 2 spec)- When I stomp it, its smooth and then around like 3500 to 4K RPM's I get this vibration. It's not too violent but enough to make me let off the throttle. Today I accelerated and then let the gas off at 4K and the vibration happened again when letting it off.
I have suspected either my rear bearings or U-joints are bad and have some play because around 90 I get a mild vibration and a steady wAAaaawAAaaa sound in a pulse. Then if I hit like 120 it seems to be the same vibration I get at lower accel speeds.
The thing is the low speed one is inconsistent, and maybe happens 1 out of ever 4 accelerations and sometimes on 1st, sometimes on 2nd, 3rd, usually not in 4th.
Also I was wondering if holding the shifter into gear would cause something like this (ie, keeping pressure back when in second, forward in 3rd). I have this habit from my dune bug cause it pops out of gear and I find myself doing it on my vette if I'm not paying attention.
I have suspected either my rear bearings or U-joints are bad and have some play because around 90 I get a mild vibration and a steady wAAaaawAAaaa sound in a pulse. Then if I hit like 120 it seems to be the same vibration I get at lower accel speeds.
The thing is the low speed one is inconsistent, and maybe happens 1 out of ever 4 accelerations and sometimes on 1st, sometimes on 2nd, 3rd, usually not in 4th.
Also I was wondering if holding the shifter into gear would cause something like this (ie, keeping pressure back when in second, forward in 3rd). I have this habit from my dune bug cause it pops out of gear and I find myself doing it on my vette if I'm not paying attention.
02-16-2011, 05:59 PM
#3
Drifting
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Never happened on acceleration till a few days ago. I've been driving on the new clutch for quite a while (about 5 months). I was driving hard today and it did not reproduce the effect I have been feeling. Might have been me pulling back on the shifter (I tried not to do that).
02-18-2011, 03:05 AM
#6
Le Mans Master
Does it occur in neutral?
Does it occur in every gear or only a certain gear?
Does it occur with clutch in as well as out?
These should help narrow down things some.
Does it occur in every gear or only a certain gear?
Does it occur with clutch in as well as out?
These should help narrow down things some.
02-18-2011, 01:55 PM
#7
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Sometimes the motor mounts get worn out and can cause exhaust to bang the bottom of the car on accel or decel. The vibration at 120 is most likely driveshaft, or tires out of balance.
Last edited by 93VettePilot; 02-18-2011 at 01:58 PM.
02-18-2011, 10:32 PM
#8
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St. Jude Donor '05
Dont hold pressure on your shifter while driving if you can help it
Check the piece on the front of the driveshaft, its a round deal I believe is bonded on there and was starting to let loose. had a similar issue on my 89 on hard accel thats what it was.
Check the piece on the front of the driveshaft, its a round deal I believe is bonded on there and was starting to let loose. had a similar issue on my 89 on hard accel thats what it was.
