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Hard hitting sound in rear

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Old Mar 10, 2011 | 05:39 PM
  #1  
Timinsk's Avatar
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Car: 1989 Camaro RS
Engine: 305 TBI
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Hard hitting sound in rear

I'll go over a bump and it sounds like from the rear of the passenger i'll hear something hard hit, like something drops from below and hits something.. hard to explain but i cant figure out what it is. I replaced the exhaust hangers, that didnt do it.. cant figure it out, only thing thats aftermarket is the subbox but that thing is snug tight..
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Old Mar 10, 2011 | 06:44 PM
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camaronewbie's Avatar
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From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Hard hitting sound in rear

Sway Bar end link loose/broken?
Shock mount broken? (under carpet)
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Old Mar 10, 2011 | 07:16 PM
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From: Memphis, TN
Car: 1992 z28 Purple Haze
Engine: 5.7L Tuned Port Injection
Transmission: 700R4
Axle/Gears: 3.23 both spinning
Re: Hard hitting sound in rear

Check the transmission mount too.
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Old Mar 10, 2011 | 07:26 PM
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//<86TA>\\'s Avatar
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Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Hard hitting sound in rear

spare tire and/or jack loose?
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Old Mar 10, 2011 | 08:32 PM
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From: Fl.
Car: 83 Trans Am / 96 Jeep XJ
Engine: 355 / 4.0 I6
Transmission: TH350 / Auto
Axle/Gears: 3.23 10-bolt / 4wd
Re: Hard hitting sound in rear

And while your checking that, check the torque arm mount, too. I had sounds that I thought were coming from the rear and that turned out to be the problem. If it is the torque arm mount, it will only get worse than it will make noise everytime you change gears or touch the gas..
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Old Mar 10, 2011 | 09:02 PM
  #6  
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From: CT
Car: 1989 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.23 LS
Re: Hard hitting sound in rear

Originally Posted by camaronewbie
Sway Bar end link loose/broken?
Shock mount broken? (under carpet)
I noticed my sway bar bushings are cracked so i'm going to replace those but i'll check the end links, i dont recall ever replacing them. I just replaced the shocks last summer so i'll double check that too.

Originally Posted by jtsk
Check the transmission mount too.
my plan was to change that to make sure, guessing i should go stock rubber

Originally Posted by bradley23150
And while your checking that, check the torque arm mount, too. I had sounds that I thought were coming from the rear and that turned out to be the problem. If it is the torque arm mount, it will only get worse than it will make noise everytime you change gears or touch the gas..
never would of thought about that one. This might also be the cause for when I go from P to R or D and i get a hard shift. but shifting gears never had an issue. Would it be best to go aftermarket or is stock just as good?

Also you meant to check the rear bolts that are connected to the pumpkin correct or just overall on the torque arm?
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Old Mar 10, 2011 | 09:14 PM
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From: Fl.
Car: 83 Trans Am / 96 Jeep XJ
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Transmission: TH350 / Auto
Axle/Gears: 3.23 10-bolt / 4wd
Re: Hard hitting sound in rear

I meant the actual torque arm mount on the transmission, go with a polyurethane unit made by energy suspension if yours is bad. It requires removing your bracket and drilling out some rivits, but its worth it to have a mount that isn't going to quickly wear out on you. It is very unlikely that the bolts on the differential housig came loose somehow, but it never hurts to check everything. Also I didnt mean gears like when the trans shifts, I meant when going from park to drive/reverse or going from reverse to drive, etc.. Also Accelerating and decelerating will cause the arm to move up or down in its metal housing causing an annoying/loud alarming noise.
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Old Mar 10, 2011 | 09:53 PM
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Re: Hard hitting sound in rear

....

Last edited by t-top havoc; Mar 10, 2011 at 09:55 PM. Reason: Never mind
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Old Mar 10, 2011 | 10:28 PM
  #9  
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From: CT
Car: 1989 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.23 LS
Re: Hard hitting sound in rear

Originally Posted by bradley23150
I meant the actual torque arm mount on the transmission, go with a polyurethane unit made by energy suspension if yours is bad. It requires removing your bracket and drilling out some rivits, but its worth it to have a mount that isn't going to quickly wear out on you. It is very unlikely that the bolts on the differential housig came loose somehow, but it never hurts to check everything. Also I didnt mean gears like when the trans shifts, I meant when going from park to drive/reverse or going from reverse to drive, etc.. Also Accelerating and decelerating will cause the arm to move up or down in its metal housing causing an annoying/loud alarming noise.
yes what you explain is exactly what i hear/feel. i will check that.
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