3rd gear vibration...WTF?
09-17-2006, 10:20 PM
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3rd gear vibration...WTF? I just finished a driver's school at a 1.8 mile road course, over the weekend. Its the 3rd time I've been 2 this track. The track is mostly 3rd gear 4 me. In later laps and on the way home, I get a vibration noise (through the shifter) in 3rd gear above 2200 rpm. I have a short shifter (no more rubber bushing), but its been on for months, and the noise started yesterday. I had a similar noise in my 95 LT1 caprice that had a t56 & bushingless hurst shifter(only in more than just 3rd). My Z28 only has 24k miles, and is otherwise really nice. Its mostly just annoying, but a sign of damage I think. I know its probly due to the track abuse.
What specifically is damaged/worn to cause this? How serious is it?
How do I fix it?
If I need a rebuild, what specific upgrades will keep it from happening again, and what builder do u recomend?
I intend to continue to raod race the car, but I don't want it to seem like a beat on track car during its 99.5% daily driver time.
Thanks in advance 4 any advice!!
What specifically is damaged/worn to cause this? How serious is it?
How do I fix it?
If I need a rebuild, what specific upgrades will keep it from happening again, and what builder do u recomend?
I intend to continue to raod race the car, but I don't want it to seem like a beat on track car during its 99.5% daily driver time.
Thanks in advance 4 any advice!!
09-17-2006, 10:26 PM
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i get the same since i got 4.10's. the ds is spinning faster in a certain rpm than my old 3.42's.
in your case trans mount may be worn out, or U joints, or both.
in your case trans mount may be worn out, or U joints, or both.
09-17-2006, 10:34 PM
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Thanks.
Also, the harder on the gas, the more intense the vibration...I was realy thinking this may be an iternal prob. I've had a broken trans mount in a f-body b4-shifter moves several inches on a hard shift. That isn't happening. And if I do same speed (and thus driveshaft speed)in a different gear the vibration goes away...seems to be 3rd gear only prob.
Also, the harder on the gas, the more intense the vibration...I was realy thinking this may be an iternal prob. I've had a broken trans mount in a f-body b4-shifter moves several inches on a hard shift. That isn't happening. And if I do same speed (and thus driveshaft speed)in a different gear the vibration goes away...seems to be 3rd gear only prob.
09-17-2006, 10:39 PM
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balance your DS too, yours is aluminum isnt it?
if its steel then you may have to do the 180* mod, unbolt it from the pinion flange, and rotate it 180* and bolt it back on.
if its steel then you may have to do the 180* mod, unbolt it from the pinion flange, and rotate it 180* and bolt it back on.
09-18-2006, 01:16 PM
#6
6600 rpm clutch dump of death Administrator
I've seen this before and it was a bearing in the gearbox. Under load it would vibrate and in 3rd it was real bad. Put it in 4th and it was smooth.
