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Old Aug 26, 2005 | 05:03 PM
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From: webster ny
Default Mystery frame bracket...

I was just under my 79 looking for a wrench, when I noticed something not to good. There is a large bracket located center of the vehicle, just behind the transmission pan. It looks like it is designed to pivot, and has a rubber part to it as well. The rubber part of the bracket has broken completely, so the bracket is just hanging there not doing much. Thought I heard a rattle the other day. Anyone know what this bracket is, what it does and repair recommendations? Sorry I dont have a picture.,
Thanks,
Hef
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Old Aug 26, 2005 | 05:18 PM
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It sounds like an aftermarket exhaust hanger...a pic will help...
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Old Aug 26, 2005 | 05:18 PM
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Sounds like the trans mount, are you familiar with it?
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Old Aug 26, 2005 | 05:23 PM
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i hardly can imagine.. but the only thing i can think about is the transmission mount :


or the diff mount.. but that is further backwardss.

art-corvette
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Old Aug 26, 2005 | 05:27 PM
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Hmm...the location is indeed where the tranny mount is. If the tranny mount has broken off then it's crucial that it be repaired immediately. Without the mount the tranny is only held on by the bell housing bolts to the engine, and the engine is only attached to the frame with the two motor mounts. This means that the tranny can move up and down and a little side to side depending on the state of the motor mounts...and would put a strain on the U-Joints as well as the motor mounts. If you jumped on the gas pedal it might just tear itself apart somewhere along the power train.
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Old Aug 26, 2005 | 05:39 PM
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It sounds as if it is definiately either the transmission mount or an exhaust hanger bracket which is in fact mounted in that same area as the other members have stated. A picture is the only real way to see exactly what you are talking about.
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Old Aug 26, 2005 | 07:25 PM
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It is an exhaust hanger...
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Old Aug 26, 2005 | 09:52 PM
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Originally Posted by Fevre
Sounds like the trans mount, are you familiar with it?
Well I looked at my OEM service manual, and I think I saw a picture of the same bracket and it was listed as the transmission mount

I have no idea how this could of broken, I drive this car like a baby. But the place where it broke looks like rubber, so maybe it just dry rotted.

Now I understand why the braket pivots, it must be to allow the tranny to move up and down.

Should I just buy a over the counter replacement transmission mount to repair?
Hef
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Old Aug 26, 2005 | 10:15 PM
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Originally Posted by Hef
Well I looked at my OEM service manual, and I think I saw a picture of the same bracket and it was listed as the transmission mount

I have no idea how this could of broken, I drive this car like a baby. But the place where it broke looks like rubber, so maybe it just dry rotted.

Now I understand why the braket pivots, it must be to allow the tranny to move up and down.

Should I just buy a over the counter replacement transmission mount to repair?
Hef

The bracket does not pivot. There are two bolts at the front and the two on top. Between the bracket and the transmission is the rubber tranny mount. This mount is cheap and easy to replace.
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Old Aug 27, 2005 | 12:15 PM
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Originally Posted by SteveG75
The bracket does not pivot. There are two bolts at the front and the two on top. Between the bracket and the transmission is the rubber tranny mount. This mount is cheap and easy to replace.
Yes you were right it was the tranny mount that was broke. It broke in half, so the mount section was hanging down making me think it was supposed to pivot.

I found a replacement for 3 bucks at a local auto parts. Cheap.
Looks like the rubber just deteriorated on the old part. 26 years old - I suppose that is to be expected. Good thing I looked under the car for that wrench. I really didnt notice anything driving the vehicle. Thanks for all your help,
Hef
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Old Aug 27, 2005 | 12:28 PM
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Old Aug 27, 2005 | 01:03 PM
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it is easy to replace, cost like $6 new. Mine broke and that in turn broke my drivers side motor mount, which in turn cause the engine to tourq up and the alternator bracket to hit my hood. talk about a sick feeling when that happend but yeah it is an easy fix
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Old Aug 28, 2005 | 04:11 AM
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Originally Posted by Hef
Good thing I looked under the car for that wrench. I really didnt notice anything driving the vehicle. Thanks for all your help,
Hef
I think there's a lot of us that should go looking for a wrench underneath the vette. Glad you got it fixed!
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Old Aug 29, 2005 | 09:05 AM
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From: webster ny
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Well I thought this would be a easy repair....
I picked up the replacement transmission mount, and installed it. Problem is when I try to line up the bracket, the holes in the bracket do not line up with the holes in the mount. I took everything out and tried it again, but same deal. Then the other thing I noticed, on the bracket itself, it has two holes at the other opposite (back end ) that look like they had something screwed in because the paint is off. When I took the bracket and mount off, nothing was there. So is there a mount on both sides of the bracket? Also any suggestions for lining up the bracket and mount? It almost looks like the tranny has to move slightly to the side.
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Old Aug 29, 2005 | 11:33 AM
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Originally Posted by strack350
it is easy to replace, cost like $6 new. Mine broke and that in turn broke my drivers side motor mount, which in turn cause the engine to tourq up and the alternator bracket to hit my hood. talk about a sick feeling when that happend but yeah it is an easy fix
Based on reading the above, I am now wondering if I also broke a engine mount and is causing my misalignment. Something that came to mind, just recently, I noticed when I take a turn (right only) my fan just barely starts "nicking" the shroud. Many years ago I had this symptom but hitting all the time, and I had a engine mount replaced. Maybe I broke a engine mount and that caused the tranny mount to break?
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Old Aug 29, 2005 | 11:49 AM
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Here is the part that I replaced:

http:////http://www.ecklers.com/prod...HFPDHHDNTQFNH9


But Ecklers also has this transmission mount as well:
http://www.ecklers.com/product.asp?d...HFPDHHDNTQFNH9
Do you use both of these on the bracket?

As I mentioned in my earlier post, when I pulled off the bracket, the mount was broke. The bracket was kind of just hanging there, it was only attached by the two small side bolts that go through the cross member and then through the bracket itself. Even these small bolts were loose.
What is strange to me is that there are two holes on top of the bracket that look like something was held in place there, but, I have no idea what. The OEM service manual does not show much.

I apologize for my ignorance - I have never worked in this area of a vehicle before.
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Old Aug 29, 2005 | 12:08 PM
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Sometimes you need to muscle the end of the tranny a bit to
get the bolts to line up perfectly. The two parts you show are
a stock style rubber mount and an aftermarket polyurethane
mount. The poly is stiffer and less susceptible to oil/etc.

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Old Aug 29, 2005 | 01:13 PM
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Originally Posted by NHvette
Sometimes you need to muscle the end of the tranny a bit to
get the bolts to line up perfectly. The two parts you show are
a stock style rubber mount and an aftermarket polyurethane
mount. The poly is stiffer and less susceptible to oil/etc.

Ahh I see ok thanks.
That answers that question. Now all I need to figure out, is what if anything goes in those two holes that are at the back end of the bracket.
In a earlier post above, I think the picture actually shows the top of two bolts that may be what I am referring to. (Arrow points to them)
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Old Aug 29, 2005 | 01:18 PM
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If you have heard a 'tic' when you turn, buy anohter SET of motor mounts and replace all of them NOW! That may have a lot to do with the line up, but even if you replaced one a while back, when the tranny mount broke, it could have easily torn the motor mount again. Don't take a chance. The throttle could hang open, the fan could catch and destroy itself, the rad, or the shroud, or like the other member stated, could raise up and break your hood. It's cheap insurance, and they are not hard to do. A little jack, slip out, slip in.
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Old Aug 30, 2005 | 11:13 AM
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Originally Posted by Glenn"Mr.Blue"Smith
If you have heard a 'tic' when you turn, buy anohter SET of motor mounts and replace all of them NOW! That may have a lot to do with the line up, but even if you replaced one a while back, when the tranny mount broke, it could have easily torn the motor mount again. Don't take a chance. The throttle could hang open, the fan could catch and destroy itself, the rad, or the shroud, or like the other member stated, could raise up and break your hood. It's cheap insurance, and they are not hard to do. A little jack, slip out, slip in.
Where would you recommend putting the jack to lift the engine when replacing the motor mounts?
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