Transmissions and Drivetrain Need help with your trans? Problems with your axle?

loud clunk on take off

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Old Nov 12, 2012 | 07:07 PM
  #1  
Ratchet23's Avatar
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From: Coventry RI
Car: 1991 firebird
Engine: 5.7 v8
Transmission: manual
loud clunk on take off

hi everyone i have a 91 firebird 3.1 v6 and when i really gun it from a dead stop there is a loud clunk but then it is fine anytime after, except when i am in second and i floor it and it kicks down to first. I figured it was the u joints so i canged the front and back u joints. It has the stock trandmission and stock rear end. When it happens it feels like it is under the console. Any ideas would help, thanks
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Old Nov 12, 2012 | 07:16 PM
  #2  
pound's Avatar
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From: Beautiful Coastal New Jersey
Car: 1990 Firebird
Engine: 350 TBI
Transmission: T5
Axle/Gears: Auburn posi 3.73
Re: loud clunk on take off

Get the front of the car on ramps or stands and check the transmission and torque arm mount.
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Old Nov 12, 2012 | 07:17 PM
  #3  
Buggy Disaster's Avatar
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From: Georgia
Car: 91' Z28. 70' Dune Buggy
Engine: LSX Cam/Full Bolt ons
Transmission: T56
Axle/Gears: 4.10
Re: loud clunk on take off

Its your transmission mount. I replaced mine and it fixed the clunk noise.
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Old Nov 12, 2012 | 08:14 PM
  #4  
red rock's Avatar
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From: WI.
Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt
Re: loud clunk on take off

A cheap fix, http://shop.advanceautoparts.com/web...smission+mount
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Old Nov 12, 2012 | 08:19 PM
  #5  
Ratchet23's Avatar
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From: Coventry RI
Car: 1991 firebird
Engine: 5.7 v8
Transmission: manual
Re: loud clunk on take off

Thanks a lot i will do the trans mount tomorrow, and that cheap fix doesnt fit in my vehicle
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Old Nov 12, 2012 | 08:21 PM
  #6  
red rock's Avatar
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From: WI.
Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt
Re: loud clunk on take off

This better? http://shop.advanceautoparts.com/web...smission+mount

Last edited by red rock; Nov 12, 2012 at 08:27 PM.
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Old Nov 12, 2012 | 08:34 PM
  #7  
Ratchet23's Avatar
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From: Coventry RI
Car: 1991 firebird
Engine: 5.7 v8
Transmission: manual
Re: loud clunk on take off

Yes thats better i will probably get it tomorrow even though the reviews arent that bad
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Old Nov 12, 2012 | 08:41 PM
  #8  
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: loud clunk on take off

Before you purchase anything, crawl under the car and take a peek. You may well have that awful and very expensive fluid-filled mount. If so, I'd recommend, swapping in a used cross member and a standard mount.

JamesC
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Old Nov 12, 2012 | 08:46 PM
  #9  
Ratchet23's Avatar
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From: Coventry RI
Car: 1991 firebird
Engine: 5.7 v8
Transmission: manual
Re: loud clunk on take off

Originally Posted by JamesC
Before you purchase anything, crawl under the car and take a peek. You may well have that awful and very expensive fluid-filled mount. If so, I'd recommend, swapping in a used cross member and a standard mount.

JamesC
How will i be able to tell if it is the fluid mount?
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Old Nov 12, 2012 | 09:08 PM
  #10  
red rock's Avatar
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From: WI.
Car: 1987 iroc
Engine: 383 TPIS intake, Dyno Don headers
Transmission: 700R4 w/Pro-built Auto/transgo 2-3
Axle/Gears: 3.27/3.70 borg warner 9 bolt
Re: loud clunk on take off

I think they are round.
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Old Nov 12, 2012 | 10:23 PM
  #11  
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From: West monroe
Car: 1991 rs camaro
Engine: 305
Transmission: 700r4
Axle/Gears: 3.73
Re: loud clunk on take off

Careful. I stripped my trans mount bolt replacing it a couple days ago still haven't gotten it out.
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Old Nov 13, 2012 | 03:23 PM
  #12  
Ratchet23's Avatar
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From: Coventry RI
Car: 1991 firebird
Engine: 5.7 v8
Transmission: manual
Re: loud clunk on take off

It was the trans mount but i got the front on a jack stand and my jack just broke -_- hopefully i cab borrow my uncles jack
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Old Nov 13, 2012 | 03:36 PM
  #13  
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From: Brooklyn NY
Car: 1985 iroc
Engine: 5.0
Transmission: auto
Re: loud clunk on take off

could also be a missing rubber bushing in the rear or front suspension.
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Old Nov 17, 2012 | 04:02 AM
  #14  
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Joined: Feb 2012
Posts: 6
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From: California
Car: 89 IROC-Z
Engine: 350 rebuilt to 383
Transmission: B&M TH700R4
Axle/Gears: not positve yet, stock?
Re: loud clunk on take off

I had the same situation but , I just put the car back together with 383 and b&m built trans and brand new mount from Orielly Auto Parts and tore that mount in half within 5 brisk drives!...so I replaced it with the black poly performance one ..bad thing is I also stripped a bolt hole to the trans installing that thing so I havent got to try this out yet also just ordered matching torque arm bushing I see that it is done with ..?wonder if that caused the new mount to tear in half! oh well
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Old Jan 6, 2013 | 10:46 PM
  #15  
stickySC's Avatar
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From: Spartanburg SC
Car: 03 Gmc Sierra ,85 camaro, astro
Engine: 305,
Transmission: a4
Re: loud clunk on take off

I may have the same problem, Im going to get some t-mounts this weekend. I had this banging noise coming from the passenger floor board, sounded like exhaust hitting floor. when turning left and accelerating. I installed wheel bearings, well i bought some, they didnt mach up so i took them back.they were ok. . "i got on it" going straight an it sounded like the trans hit the pavement.
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