Spoony Member 250 Member For: 13y 6m 14d Gender: Male Location: Brisbane Posted 09/03/11 02:34 AM Share Posted 09/03/11 02:34 AM I know the diff bush on my BF is getting a bit shagged. However I've also noticed the car developing a sort of 'hummmm'/harmonic vibration, most noticable on deceleration around 40km/hr. I wonder if it could be the diff bush also. I have read they also can cause knocks/clunks from the back end over bumps when they are on their way out too? Seems most noticable on bumps that only effect once side/single wheel of the car. Happens on both sides hence why I'm thinking it could also be the diff bush too? Last time it was on the hoist (8000kms ago) all other bushes looked fine. I think I'll go the Superpro comfort bush, hopefully it lasts well? Link to comment Share on other sites More sharing options...
scottay Member 366 Member For: 14y 1d Posted 09/03/11 04:27 AM Share Posted 09/03/11 04:27 AM humming may be wheel bearings Link to comment Share on other sites More sharing options...
Spoony Member 250 Member For: 13y 6m 14d Gender: Male Location: Brisbane Posted 09/03/11 04:34 AM Author Share Posted 09/03/11 04:34 AM maybe but I don't think so (have felt gone wheel bearings before). It's sort of like a deep resonance through the car as it slows down, or at certain throttle load (on off) etc. I haven't tried but I don't think it will do it in neutral as it seems more like a engine/drivetrain load thing on decel. You've got me thinking now though, so can see how it goes, brakes, no brakes, in drive, in neutral etc. cheers. Link to comment Share on other sites More sharing options...
FastR1Red Member 360 Member For: 18y 11m 23d Gender: Male Location: Mt Waverley Posted 09/03/11 07:53 AM Share Posted 09/03/11 07:53 AM How low is your car? Link to comment Share on other sites More sharing options...
Spoony Member 250 Member For: 13y 6m 14d Gender: Male Location: Brisbane Posted 09/03/11 08:13 AM Author Share Posted 09/03/11 08:13 AM standard height. I tested it on the way home, doesn't happen in neutral, so its definately the way drivetrain/suspension is being loaded up by the engine. Not just breaks or a speed related thing Link to comment Share on other sites More sharing options...
PSI40T Member 448 Member For: 17y 2m 6d Posted 10/03/11 09:55 PM Share Posted 10/03/11 09:55 PM my fg xr6t sedan was making a thump sound randomly in the rear, turned out to be the diff bush. Had it replaced and the thump went away Link to comment Share on other sites More sharing options...
FastR1Red Member 360 Member For: 18y 11m 23d Gender: Male Location: Mt Waverley Posted 10/03/11 10:04 PM Share Posted 10/03/11 10:04 PM standard height. I tested it on the way home, doesn't happen in neutral, so its definately the way drivetrain/suspension is being loaded up by the engine. Not just breaks or a speed related thingOk that rules 1 thing out at least. A couple of threads last year about lowered T's cut bump stops etc, but it's something else.Maybe get a once over at a good suspension shop,,,where are you based? Link to comment Share on other sites More sharing options...
Spoony Member 250 Member For: 13y 6m 14d Gender: Male Location: Brisbane Posted 10/03/11 10:17 PM Author Share Posted 10/03/11 10:17 PM I'm in Brisbane so yeah I think I'll have to get it sussed at a suspension shop. It's still got extended warranty on it, which has been pretty good at covering most stuff. Except they 'set' the value/time to fix the quoted job so ones gotta be careful who you use etc and make sure they are ok using them (they pay quick as though, Swann). I can see them only paying part of bush/whatever but (wear & tear) etc. Cheers. Link to comment Share on other sites More sharing options...
rcm81 Member 8 Member For: 13y 5m 26d Gender: Male Location: Townsville, NQ Posted 11/03/11 01:27 AM Share Posted 11/03/11 01:27 AM My 04 BA Ute has the same thing at 80kph just a slight hummmm on light throttle and goes away when you back off the throttle. My 98 longreachute had the same thing but was way louder and ended up being the hard facing on the diff gears wearing off and needed a new diff...hope itsnot the same thing. Link to comment Share on other sites More sharing options...
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