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28-11-2010, 10:32 AM
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#1 | ||
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Regular Member
Join Date: Jun 2006
Location: S.E melbourne
Posts: 211
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Hey guys i have a vibration coming through my gearbox at high revs in 2nd and 3rd (havent tested in top of 4th). The Vibration is felt through the gearknob mainly but passengers notice it aswell and i was just wondering what it could be?? The car is a manual xr8 aswell.
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28-11-2010, 11:41 AM
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#2 | ||
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Banned
Join Date: Dec 2004
Location: searching for cubes
Posts: 6,672
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In order of probability ...
1. Tailshaft uni or gearbox/engine mount 2. Diff - front bush mount or pinion bearing 3. Loose gear selector 4. Rear wheel balance |
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28-11-2010, 12:10 PM
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#3 | ||
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Flairs - Truckers Delight
Join Date: Aug 2006
Location: Brisbane Northside Likes: Opposite Lock
Posts: 5,731
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other contenders:
Engine mount monged tyres buckled wheel(s)
__________________
Current: Silhouette Black 2007 SY Ford Territory TX RWD 7-seater "Black Banger"
2006-2016: Regency Red 2000 AUII Ford Falcon Forte Automatic Sedan Tickford LPG "Millennium Falcon" |
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28-11-2010, 03:51 PM
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#4 | ||
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FF.Com.Au Hardcore
Join Date: Apr 2009
Location: jimboomba
Posts: 4,638
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Torque converter
__________________
Welder/Fabricator at Beaudesert Exhuast Posted by Xcabbi, Does it slap or rattle? Rattle is more to do with timing chains and tensioners. Slap is more to do with lifters, rings, bearings or GENIII boat anchors |
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28-11-2010, 04:18 PM
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#5 | ||
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Banned
Join Date: Dec 2004
Location: searching for cubes
Posts: 6,672
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   With a manual gearbox? Don't think so ... 
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28-11-2010, 04:31 PM
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#6 | |||||
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Regular Member
Join Date: Jun 2006
Location: S.E melbourne
Posts: 211
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Quote:
2. Could be this as car is pretty low maybe that could be affecting it?? 3. It has a short shifter so definitly a possibilty. 4. just had wheels balanced Quote:
Quote:
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28-11-2010, 04:56 PM
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#7 | ||
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FF.Com.Au Hardcore
Join Date: Apr 2009
Location: jimboomba
Posts: 4,638
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lol, didnt read the last bit. woops
__________________
Welder/Fabricator at Beaudesert Exhuast Posted by Xcabbi, Does it slap or rattle? Rattle is more to do with timing chains and tensioners. Slap is more to do with lifters, rings, bearings or GENIII boat anchors |
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28-11-2010, 05:58 PM
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#8 | ||
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Banned
Join Date: Dec 2004
Location: searching for cubes
Posts: 6,672
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So was the gearbox mount itself replaced at the same time as the engine mounts?
With lowering an IRS vehicle the tailshaft angle doesn't alter so it shouldn't be related directly and the diff bushes likewise not directly affected by lowering - they just flog out with age. My money is on the unis. |
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28-11-2010, 08:17 PM
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#9 | ||
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Starter Motor
Join Date: Aug 2010
Posts: 6
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tailshaft out of balance? or extention housing bush unsure if the manual gearboxes have the bush like the autos do. but a possible lead for you. good luck
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29-11-2010, 08:23 AM
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#10 | ||
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Regular Member
Join Date: Jun 2006
Location: S.E melbourne
Posts: 211
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I'm not sure if the gearbox mounts were replaced I don't think they were. The only thing that about it being an issue with the diff or tailshaft is that it's not wheel speed related it's engine speed (happens at high revs only) so I was thinking it had to do with something with the gearbox/engine.. am I correct in saying this or is that an incorrect assumption?
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29-11-2010, 11:16 AM
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#11 | ||
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Banned
Join Date: Dec 2004
Location: searching for cubes
Posts: 6,672
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That sounds like sound reasoning.
Could even be in the clutch or throw-out bearing. And as well as the shifter, it could also be internal like gearbox bearings or thrust races. Hope it isn't your flywheel loose - has been known to happen and the symptoms are similar to what you describe. If you are sure it is engine speed related and not road speed related then I'd be looking very seriosly at trouble shooting it sooner rather than later. |
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29-11-2010, 08:13 PM
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#12 | ||
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Regular Member
Join Date: Jun 2006
Location: S.E melbourne
Posts: 211
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hmmm thats what im worried about it being the gearbox internals or worse engine internals...
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12-12-2010, 07:45 PM
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#13 | ||
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FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 781
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the clutch throw bearings vibrate real bad ,especialy in 4th and 5th at high speed .
try putting your foot on the clutch and see if the vibration stops.
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au2 s i6 5 spd , au series 1 xr6 hp motor, cam advanced 5*,jmm cai ,topgun leads,pacey 4480's,3 inch cat,lukey 2 1/2 sports zorst and 3.89 lsd,standard ecu. current best,14.939 @ 93.17. |
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Gearbox Vibration
Linear Mode
