Topic: Dual Exhaust Bracket
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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I am going to be installing a true dual exhaust system on my 79 and have a question about the bracket that mounts at the tail of the tranny area that the exhaust pipes clamp to before they cross through the frame. I have looked at pictures on-line of the cars that have true duals but I'm a bit confused on where exactly the darn bracket mounts. Do I have to unbolt the trans mount and jack it up and slip the bracket in between the trans and the mount surface or does it go on top of the whole assembly? I just have not seen a clear enough picture to know for sure exactly where it should be attached. Thanks in advance for any help you guys can provide.
|UPDATED|2/27/2012 7:47:55 AM (AZT)|/UPDATED|
KC
|UPDATED|2/27/2012 7:47:55 AM (AZT)|/UPDATED|
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Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
The bracket will go between the top of the mount, and the trans tailhousing. You will need to un-bolt the mount from the trans, jack the trans up, remove the mount, then slide the bracket up there, replace the mount, and bolt everything back up.
hth
hth
Joel Adams
C3VR Lifetime Member #56 
My Link 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
That's an interesting question Keith. Cars as old as ours have almost certainly had the exhaust changed out since new. I have 3 setups similar to yours (duals going through the cross member) and they're all different. One setup with long tube headers, the pipes leave the collector, go through the cross member, and are not supported til they get to the large cross frame piece. Another muffler guy designed shaped rods that he welded on the pipes just after the cross member and they slip through rubber grommets resting in holders on the back side of the cross member. The 3rd setup is as you discribed, so I can see your frustration. This is a '75 I got recently and it hasn't been out on the road yet, maybe a good thing. After close inspection I see they're are no bolts in the trans mount 'cause some bubba couldn't get the hole to align correctly. So it seems your system may have been designed to fit that way but with some re-engineering you can do almost anything. Great looking vette. Please keep us posted on the outcome.
Jimmy B.
Just can't wait to get on the road again. 
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Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
Thanks for clearing that up Joel. At least yours is correct and precise info. We must have been writing at the same time, You're pretty quick on the draw hombre.
Jimmy B.
Just can't wait to get on the road again.
Click to see larger views!
Thanks guys! Believe it or not my car only has 8k miles on it and is all original underneath. No exhaust work has ever been done and even the mufflers have the original build date on them. I'm using the original GM bracket for true dual exhaust, that cat has to go, so now I just have to jack that tranny and I will be good to go. Thanks for the help.
KC
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Be prepared to utter a few unsavory words in the process...it's not gonna just zap itself up in there...you'll have to fanagle it quite a bit. At least your's isn't a 4 peed....
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
It is a 4-speed but I do have the linkage off right now because I am rebuilding the shifter. I hope you will tell me that will give me enough clearance to get the trans jacked up for the bracket install...........
KC
KC
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
yeah...your screen name should have given that away, eh? 
It will go in there, but just don't expect it to slide right in. You will have to twist/turn/tilt it every which way....and then realize it's backwards or something...
Does your car have exhaust on it now, or will you have it all off before putting the bracket on? That will definitely make a difference.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
I usually have the cross member lowered on one side, dropping the tranny down to get the shifter off, so it musta been tricky . There might be an easier way ?
Jimmy B.
Just can't wait to get on the road again.
Click to see larger views!
The stock exhaust has been removed from the car so I think I will at least have a fighting chance. Sure wish I had a lift in my garage. I'm getting too old to be working on a car up on jackstands! Oh, to be young again!
Thanks for the input guys!
KC
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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