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11-14-2006, 10:58 AM
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#1 | | 12 Second Club
Join Date: Jun 2006 Location: Kerrville, TX
Posts: 209
|  High RPM vibration
I get a light vibration at rpms in excess of 4k, It has been doing this for about a year now so I'm starting to wonder if it is the tranny, wouldn't it of died by now?
I have a SPEC 3 clutch w/SPEC steel flywheel, which besides occasionally giving me fits on getting the car into a gear from neutral it works fine.
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96 M6 Trans Am | 
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11-16-2006, 10:13 AM
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#2 | | 12 Second Club
Join Date: Jun 2006 Location: Kerrville, TX
Posts: 209
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ttt
Also, I recently discovered it does it while revving the car in neutral as well.
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96 M6 Trans Am | |
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11-17-2006, 11:39 AM
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#3 | | 12 Second Club
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ttt 
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96 M6 Trans Am | |
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11-17-2006, 11:49 AM
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#4 | | 12 Second Club
Join Date: May 2006 Location: College Station, Texas
Posts: 908
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What transmount are you running? Also crawl underneath and check out your torque arm mount for cracks. A failing pilot bearing could also cause this because the mainshaft of the trans spins inside that bearing. In my case the bearing was completley gone and I would get bad vibrations above 4k even with the stock clutch setup.
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1998 Z28 Ls1 M6 [SOLD] 12.51@114.6MPH - 370rwhp 373rwtq
1993 Z28 Lt1 M6 [383 w/ 12:1 Compression, ZERO TRACTION] | 
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11-17-2006, 12:00 PM
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#5 | | 12 Second Club
Join Date: Jun 2006 Location: Kerrville, TX
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I have just a rubber trans mount. If it is the torque arm mount it will be fixed when I throw in the new torque arm and mount Sunday...but I don't see how it could be, because it vibrates in neutral with or with out the clutch engaged.
Thanks for the reply.
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96 M6 Trans Am | |
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11-17-2006, 08:20 PM
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#6 | | 12 Second Club
Join Date: May 2006 Location: College Station, Texas
Posts: 908
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Oh it does it in neutral as well. It could still be tranny mount although very unlikely in neutral. Being that it is a 96, motor mounts could also be and issue but I would never rule out the possibility of a blown pilot bearing.
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1998 Z28 Ls1 M6 [SOLD] 12.51@114.6MPH - 370rwhp 373rwtq
1993 Z28 Lt1 M6 [383 w/ 12:1 Compression, ZERO TRACTION] | |
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11-17-2006, 09:11 PM
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#7 | | 12 Second Club
Join Date: Jun 2006 Location: Kerrville, TX
Posts: 209
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pretty new LT4 pilot bearing. I'll check the motor mounts though.
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96 M6 Trans Am | |
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11-18-2006, 12:15 AM
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#8 | | TECH Regular
Join Date: Nov 2006 Location: Tulsa, OK
Posts: 456
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Take a close look at your crankshaft balancer for abnormalities. The steel flywheel a recent install? Maybe threw off the engines natural recipricating balance. I have accually purchased and installed an aftermarket flywheel that had a bad balance. | |
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11-18-2006, 12:28 AM
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#9 | | 12 Second Club
Join Date: Jun 2006 Location: Kerrville, TX
Posts: 209
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I plan to take a look at the balancer tomorrow, it's a cheapy autzone one.
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96 M6 Trans Am | |
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11-19-2006, 12:35 AM
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#10 | | 12 Second Club
Join Date: May 2006 Location: College Station, Texas
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Any word on this?
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1998 Z28 Ls1 M6 [SOLD] 12.51@114.6MPH - 370rwhp 373rwtq
1993 Z28 Lt1 M6 [383 w/ 12:1 Compression, ZERO TRACTION] | |
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11-20-2006, 12:40 PM
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#11 | | 12 Second Club
Join Date: Jun 2006 Location: Kerrville, TX
Posts: 209
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Not yet, we ran into some problems and didn't get the car back up and going yesterday.
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96 M6 Trans Am | |
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11-27-2006, 10:37 AM
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#12 | | 12 Second Club
Join Date: Jun 2006 Location: Kerrville, TX
Posts: 209
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The balancer looks fine..
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96 M6 Trans Am | |
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