New Trans Mount, New Noise?
Thread Starter
On The Tree
Joined: May 2002
Posts: 149
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From: Indian Trail N.C.
New Trans Mount, New Noise? My car developed a "thunk" at the beginning of every gear under WOT shortly after a stage II head/cam job. After much research, decided to try an energy trans mount. I understood I would get a little more vibration and noise. I installed the mount and to say the least, it's a LOT more vibration and noise. 
I'm getting noises at different levels of the rpm range but probably the worst thing is the exhaust. I'm running LT's into a Corsa Cat-back and it's pretty loud so the car vibrated anyway (expecially with the cam lope) but now it's like I can feel EVERYTHING going on in the engine 
Good news is, the thunk is gone and the drivetrain feels incredibly tighter but it is a an annoying compromise.
I'm thinking dynamat/jute around the console and seat area (already done the rear) but I'd love to hear opinions/advice as to what may help minimize some of the noise and vibrations. The car is a 2001 SS, See sig for specs on the car.
I'm getting noises at different levels of the rpm range but probably the worst thing is the exhaust. I'm running LT's into a Corsa Cat-back and it's pretty loud so the car vibrated anyway (expecially with the cam lope) but now it's like I can feel EVERYTHING going on in the engine Good news is, the thunk is gone and the drivetrain feels incredibly tighter but it is a an annoying compromise.I'm thinking dynamat/jute around the console and seat area (already done the rear) but I'd love to hear opinions/advice as to what may help minimize some of the noise and vibrations. The car is a 2001 SS, See sig for specs on the car.
On The Tree
Joined: Nov 2003
Posts: 102
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I have seen this a few times with the energy mounts. What i have found is the extra noise/vibration is the motor mounts. If u think ur motor mounts are fine try a regular GM replacement trans mount. See if that makes a differance.
I hope I helped.
I hope I helped.
Thread Starter
On The Tree
Joined: May 2002
Posts: 149
Likes: 0
From: Indian Trail N.C.
Originally Posted by SilverM6SS
I have seen this a few times with the energy mounts. What i have found is the extra noise/vibration is the motor mounts. If u think ur motor mounts are fine try a regular GM replacement trans mount. See if that makes a differance.
I hope I helped.
I hope I helped.
On The Tree
Joined: Nov 2002
Posts: 115
Likes: 0
From: Corpus Christi Texas
The poly trans mount is allegedly designed for the LT1, and, in any event, is a couple of mm's too tall. It casuses the top of the trans to rub against the tunnel and transmit a huge amount of noise into the car at 2200 rpm and up.
A fix is to put one steel fender washer, with a 3/8ths inch hole I think, between the floor and the crossmember, at each of the 4 bolts that hold the trans brace to the floor. This will lower the trans back to stock height and the noise is basically gone.
A slight vibration is normal, but noise like a helicopter going by is not. The poly mount (when lowered) makes only a little vibration you can feel through your feet, rather than noise. Also I used 4 delrin fender washers instead of fender washers but the idea is the same. Delrin is brand name for a harder and more durable type of nylon. It compresses very little and is a little harder than a polyurethane washer.
A fix is to put one steel fender washer, with a 3/8ths inch hole I think, between the floor and the crossmember, at each of the 4 bolts that hold the trans brace to the floor. This will lower the trans back to stock height and the noise is basically gone.
A slight vibration is normal, but noise like a helicopter going by is not. The poly mount (when lowered) makes only a little vibration you can feel through your feet, rather than noise. Also I used 4 delrin fender washers instead of fender washers but the idea is the same. Delrin is brand name for a harder and more durable type of nylon. It compresses very little and is a little harder than a polyurethane washer.
