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Clunking noise under Accel/Decel also over bumps!!!

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Old 06-26-2009, 04:14 PM
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Default Clunking noise under Accel/Decel also over bumps!!!

Well i had this very small clunking noise up near the trans. it has grown to be very loud and i can feel it pretty bad now. When i give it some power it clunks and if i let off real quick it clunks too. Also when im going over bumps as the rear end hits the bump i hear and feel the clunk up front in the trans area. I am assuming the trans mount or TA mount are shot??? anyone had this???
Old 06-26-2009, 06:55 PM
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Sounds like a broken transmission mount. Replace it with a factory rubber one; not polyurethane.
Old 06-26-2009, 06:58 PM
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Same thing happened to me it was my torque arm mount
Old 06-26-2009, 08:30 PM
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Yep to all the above...also check to see if the clamp shell on the tranny didn't crack where it connect to the Torque Arm.
Old 06-27-2009, 03:30 PM
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why do you recommend a rubber mount and not poly?
Old 06-28-2009, 09:46 AM
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Originally Posted by tallreyes
why do you recommend a rubber mount and not poly?

It's been known to cause serious vibration issues, which has lead to shifting and breaking part problems.
Old 06-28-2009, 10:32 AM
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Poly mounts are much harder and dont give under pressure.
Old 06-28-2009, 02:03 PM
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ok reason i ask is because i recently replaced my broken factory one with a poly mount i found at the local auto parts store and i have a bad vibration under acceleration so looks like i have to go find me a factory replacement anyone know where to get deal on one my local chevy dealer is asking 140.00
Old 06-28-2009, 03:13 PM
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Originally Posted by tallreyes
ok reason i ask is because i recently replaced my broken factory one with a poly mount i found at the local auto parts store and i have a bad vibration under acceleration so looks like i have to go find me a factory replacement anyone know where to get deal on one my local chevy dealer is asking 140.00
I found a rubber oem style replacement at napa auto parts for like 17 bucks. I was running the prothane poly mount and had horrible vibrations, its a night and day difference from poly to rubber for me...
Old 06-28-2009, 11:23 PM
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ws666 do you have a part #? Thanks!
Old 06-29-2009, 01:19 PM
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thanks and let us know if you know the part number? thanks for the help
Old 06-29-2009, 06:06 PM
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I just called the napa I got mine from and I think I got the right part number finally all though Aparently I was talking to a moron!

First he asked if I was a 5 speed or 6 speed lol, I'm like 5 speeds not even an option is it?
Then he tells my firebirds are wierd cuz some have an offset mount and some dont, i'm like WTF no their not their all the same,

then he tells me it shows a hydrolic one for 75 bucks So ya that guys smoking some good crack cuz I've never heard of a hydrolic trans mount.

Anyways after all that I think he found the right one cost was $15.29 and the pn is 6201543. BTW I think the stud size on that one may be slightly smaller than the GM mount so open it up at the store and find a nut and washer that will work before you get home and try to install it. hope this helps. ~wes
Old 06-29-2009, 07:24 PM
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awesome thanks for the help and ya i got a few of those type guys working at my local napa also that's why i asked for a part number thanks




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