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Old 07-26-2009, 12:48 PM   #1
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clunk under hard accel - how do diagnose
I started noticing a clunk - only under hard, WOT accel. Will happen going at 70 or from a dead stop. Will do it stopped with the brake on as well. It almost feels like someone if bumping you from behind but you feel it on the shifter.

I have an 89 GTA 5.7 with about 500 miles on the following mods: transgo shift kit (the more expensive one), ZZ4 cam, Vortech heads and TPI vortec intake, AS&M runners, ported intake, bigger TB, custom PROM.

I have an appointment to get the car dyno tested next week and I'm not sure if the numbers will be off because of this driveline issue.

I had someone power brake the car while I looked underneath and under the hood, and I didn't see any movement that was out of the ordinary. Also, no bump at all under partal throttle - you have to really be standing on it to make it happen.

thanks in advance for any insight!!
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Old 07-26-2009, 01:07 PM   #2
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Re: clunk under hard accel - how do diagnose
Check your trany mount and your torque arm mount .
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Old 07-26-2009, 01:09 PM   #3
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Re: clunk under hard accel - how do diagnose
did more searching and saw that that's a good place to start... thanks.
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Old 07-26-2009, 01:21 PM   #4
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Re: clunk under hard accel - how do diagnose
Your welcome . My car is a 5-speed and it was doing that really bad all the time because of shifts and once it was the torque arm mount then again when the tranny mount went .
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Old 07-26-2009, 05:43 PM   #5
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Re: clunk under hard accel - how do diagnose
It was the trans mount - never had one go like that.
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Old 07-27-2009, 03:44 AM   #6
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Re: clunk under hard accel - how do diagnose
It's pretty common for hte trans mount to go bad and do that int hese. I suggest everyone go to a poly mount.
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Old 07-28-2009, 06:33 PM   #7
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Re: clunk under hard accel - how do diagnose
my car to clunks when it shifts. i have a 700R4 with a stout shift kit in it. with moderate throttle it clunks adn shakes the car. at wot it feels like something is hitting your hand whenit shifts, sounds liek i need to look at the trans mount. any suggestions on a good quality poly mount?
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Old 07-31-2009, 03:41 AM   #8
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Re: clunk under hard accel - how do diagnose
Quote:
Originally Posted by S10GUY View Post
my car to clunks when it shifts. i have a 700R4 with a stout shift kit in it. with moderate throttle it clunks adn shakes the car. at wot it feels like something is hitting your hand whenit shifts, sounds liek i need to look at the trans mount. any suggestions on a good quality poly mount?
http://www.spohn.net/shop/1993-1997-...-Mount-GM.html
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Old 07-31-2009, 03:41 AM
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