Clunk when accelerating
Thread Starter
Junior Member
Joined: Feb 2016
Posts: 22
Likes: 0
From: Wisconsin
Car: 88 Camaro z28
Engine: 305
Clunk when accelerating
Hey I have a question that i need help figuring out. I have a 88 camaro that has a single clunk when it accelerates kinda fast from a stop, it does not happen when it neutral or park but it have when revving and holding the brakes. could this be a bad torque arm? Please help.
Supreme Member
iTrader: (3)
Joined: Jun 2007
Posts: 2,359
Likes: 5
From: Pennsylvania
Car: 1992 Camaro RS
Engine: Rebuilt 350 going in after paint
Transmission: WCT5, 7k & counting behind the 350
Axle/Gears: 4thgen disc rear w/ 3.73 Posi
Re: Clunk when accelerating
Classic sign of a bad transmission mount. Torque arm doesn't really "go bad", it would either bend or maybe break. Never heard of that happening though.
Senior Member
Joined: Mar 2011
Posts: 578
Likes: 1
From: Colorado Springs
Car: 91 firebird Formula 350
Engine: 350 TPI
Transmission: N/A, working on a t5 swap
Axle/Gears: 3.73 posi
Re: Clunk when accelerating
Joined: Sep 2005
Posts: 27,871
Likes: 2,430
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Clunk when accelerating
I cannot TELL YOU how many trans mounts I have tore up in my car. I tore one up one time THE VERY FIRST TIME I took off after putting it in and backing down the driveway.
That whole part of our cars is a giant engineering .... erectile dysfunction.
It quit after I put in a torque arm with a sensible design, that wasn't constantly trying to tear up the trans mount.
That whole part of our cars is a giant engineering .... erectile dysfunction.
It quit after I put in a torque arm with a sensible design, that wasn't constantly trying to tear up the trans mount.
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Supreme Member
Joined: Apr 2006
Posts: 4,482
Likes: 9
From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Clunk when accelerating
Normally you will hear a broken/tore transmission mount "clunk" (feels like it wants to come through the floor between the front seats), when you shift from "park" into "gear" from a stop.
The way to see if the transmission mount is bad is to place a decent size block of wood under the transmission oil pan so the jack won't punch through it an jack it up a "little" bit.
You are looking to see if the rubber part of the mount has torn away from the metal mounting plate that it was attached to.
If you just look at it without lifting it , it will look fine.
It was a pain to find the Polyurethane Transmission Mount that would work but I finally did.
Energy Suspension Mount # 3.1108G with out using the pre-load plate.
No more torn trans. mounts for me.
The way to see if the transmission mount is bad is to place a decent size block of wood under the transmission oil pan so the jack won't punch through it an jack it up a "little" bit.
You are looking to see if the rubber part of the mount has torn away from the metal mounting plate that it was attached to.
If you just look at it without lifting it , it will look fine.
It was a pain to find the Polyurethane Transmission Mount that would work but I finally did.
Energy Suspension Mount # 3.1108G with out using the pre-load plate.
No more torn trans. mounts for me.
Last edited by Ron U.S.M.C.; Mar 4, 2016 at 01:35 AM.
Member
Joined: Feb 2011
Posts: 175
Likes: 1
From: West Michigan
Car: 1989 Formula Firebird
Engine: Swapped 350 TPI speed density
Transmission: 700R4
Axle/Gears: 2.73 (soon to be 3.42)
Re: Clunk when accelerating
Check the bushing. And definitely get the poly when you replace it. You won't be disappointed!
Joined: May 2008
Posts: 867
Likes: 1
From: pawtucket RI
Car: 1986 iroc
Engine: alum. head 350 supercharged
Transmission: 6speed
Axle/Gears: ford 9in 3.90 35 spline moser axles
Re: Clunk when accelerating
i put a poly mount in and haven't looked back and that was 20 years ago
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: Clunk when accelerating
Not all members are happy with the poly mount. You might consider checking the following link for info before throwing down your cash.
https://www.thirdgen.org/forums/tran...ison-pics.html
JamesC
https://www.thirdgen.org/forums/tran...ison-pics.html
JamesC
Last edited by JamesC; Mar 9, 2016 at 06:59 AM.
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