Suspension and Chassis Questions about your suspension? Need chassis advice?

Rear end thumping

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Old Jun 10, 2003 | 06:04 AM
  #1  
Formula_Fire's Avatar
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From: Clawson, MI
Car: 1992 Firebird
Engine: TBI 305
Transmission: 4L60
Axle/Gears: 2.73
Rear end thumping

I need some help with a noise comming from my rear end it only happens when I accelerate hard it feels like the rear end or the torque arm is just hitting the bottom of the car. I tore in my suspension and it was pretty toast sagging springs and my sway bar bushings wern't there literally the sway bar was held up with a coat hanger on both sides (just bought the car 6 months ago)... Anyway I put new springs, shocks and sway bar bushings on it, and it seems a little bit better but I still get the thud when I punch it hard, I had a friend sit in the passanger seat and he said it felt like it was hitting right next to him in the driveshaft well. Someone said it might be a bad trans mount. Anyone?
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Old Jun 10, 2003 | 09:00 AM
  #2  
RB83L69's Avatar
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Trans mount. They always break. It's not a question of "if" it breaks, merely a matter of "when".

Get a polyurethane one such as Energy Suspension or Prothane.
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Old Jun 10, 2003 | 09:29 AM
  #3  
Dewey316's Avatar
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From: Portland, OR www.cascadecrew.org
Car: 1990 Camaro RS
Engine: Juiced 5.0 TBI - 300rwhp
Transmission: T5
Axle/Gears: 3.42 Eaton Posi, 10 Bolt
yeah i would say trans mount.

it could possibly be the tq arm mount, but it sounds more like a trans mount that the tq arm.
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Old Jun 10, 2003 | 09:46 PM
  #4  
Formula_Fire's Avatar
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From: Clawson, MI
Car: 1992 Firebird
Engine: TBI 305
Transmission: 4L60
Axle/Gears: 2.73
How bad is that? I mean is it something I could do in my driveway in an hour or so by replaceing the mount or is it something like that I'd have to find a new crossmember or weld it up or something. Also assuming its just the bushing what would you guys recomend?
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Old Jun 10, 2003 | 10:22 PM
  #5  
Timz2882's Avatar
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From: north plainfield, nj
Car: 05' GTO
Engine: 6.0L
Transmission: A4
u should be able to change the ushing in like 25-30 mins if that.
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Old Jun 10, 2003 | 10:25 PM
  #6  
Token's Avatar
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
I'll third the tranny mount- mine does too.
just got an Energy Suspension mount for like $20 on Summit.
Gotta change that old one out.
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Old Jun 11, 2003 | 12:40 AM
  #7  
Formula_Fire's Avatar
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From: Clawson, MI
Car: 1992 Firebird
Engine: TBI 305
Transmission: 4L60
Axle/Gears: 2.73
OK thanks, I'll try the trans mount probably go with the energy suspension piece too
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Old Jun 11, 2003 | 06:05 AM
  #8  
Dewey316's Avatar
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From: Portland, OR www.cascadecrew.org
Car: 1990 Camaro RS
Engine: Juiced 5.0 TBI - 300rwhp
Transmission: T5
Axle/Gears: 3.42 Eaton Posi, 10 Bolt
it is actualy a very nice little upgrade, you'll be pleased

it is very easy to do, jack up the car on jack stands, put a jack under the tranny to support it, unbolt the crossmember, and the mount. reassamble.
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Old Jun 11, 2003 | 03:11 PM
  #9  
Formula_Fire's Avatar
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From: Clawson, MI
Car: 1992 Firebird
Engine: TBI 305
Transmission: 4L60
Axle/Gears: 2.73
Cool thanx for the help everyone, Token let me know how yours goes, I'm probably gonna replace the mount sometime next week myself.
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