loud clunk on take off
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 64
Likes: 0
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
Member
iTrader: (7)
Joined: Dec 2005
Posts: 276
Likes: 9
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.
Senior Member
iTrader: (1)
Joined: Mar 2012
Posts: 574
Likes: 8
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.
Supreme Member
iTrader: (2)
Joined: Sep 2009
Posts: 1,591
Likes: 5
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
Supreme Member
iTrader: (2)
Joined: Sep 2009
Posts: 1,591
Likes: 5
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
Last edited by red rock; Nov 12, 2012 at 08:27 PM.
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Joined: Aug 1999
Posts: 19,282
Likes: 103
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
JamesC
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 64
Likes: 0
From: Coventry RI
Car: 1991 firebird
Engine: 5.7 v8
Transmission: manual
Re: loud clunk on take off
Supreme Member
iTrader: (2)
Joined: Sep 2009
Posts: 1,591
Likes: 5
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.
Junior Member
iTrader: (1)
Joined: Sep 2012
Posts: 53
Likes: 0
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.
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 64
Likes: 0
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
Junior Member
Joined: Feb 2012
Posts: 6
Likes: 0
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
Junior Member
Joined: Sep 2011
Posts: 31
Likes: 0
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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