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Cowl Shake
#1
Hey guys I am looking for some input. Without adding a rollbar or cage, I am looking ways to reinforce the car. I plan to build some subframe connectors similar to the global or maier pieces. I am thinking of adding a center reinforcement similar to the total control unit. has anyone tied the connectors into the original rockers? I am also thinking of seam welding the shock towers and adding the boss 302 gussets to the towers near the upper control arms. My goal is to have a nice quiet (as quiet as a convertible can be) good handling road car. The mods must be as invisible as possible.
Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#2
It is important to remember that to a vast degree, shock dampening determines ride. If a smooth ride is your priority, you should go for some type of standard gas shocks - - stay from the stiffer ones like KYB and Konis.

Furthermore, if your rear springs are getting a bit tired, you might want to swap them out for some stiffer five-leaf, mideye with rubber or urethane bushings. In the front, go with 620 coils.

Hope this helps!

BT
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#3
Once you start adding all that reinforcement the car becomes more ridge which in turn with make any type of vibrations be amplified to any other parts like dashs, seats, interior brackets and such. Causing a very loud interior. Some ways of fixing those rattles though and putting in the stiffners and such is to run that one side sticky foam under every screw on the dash and interior panel. (pain in the butt) If you are just looking for ride quality cobra3073 could not have said it better. Unless you wanted to go with air bags all the way around.

Hope that helps

Cory
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#4
Good points, The subframe connectors will add some good rigidity. Maybe go 1 step at a time. suspension upgrades are in the mix as well.
Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#5
We have one club guy with a gold glow 71 vert. He installed subframe connectors recently and has been raving about the benefits. Verts are so wiggly to start that adding the subframes would at least get you the structural integrity of a coupe or fast back.

After he installed the subframes he said it was a different car, worth doing in my book.

Eventually I would install subframe connectors on my fastback.
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#6
Now it's a matter of making a pattern and getting some tubing bent. I'm plotting to build a set... kinda a cross between the GW and Maier pieces, wrapping around the rear rail and also tying into the spring perch area. I'd like to add an X brace ala the TCI system. I LOVE building this stuff!
Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
  Reply
#7
(07-07-2010, 06:44 PM)droptop73 Wrote: Hey guys I am looking for some input. Without adding a rollbar or cage, I am looking ways to reinforce the car. I plan to build some subframe connectors similar to the global or maier pieces. I am thinking of adding a center reinforcement similar to the total control unit. has anyone tied the connectors into the original rockers? I am also thinking of seam welding the shock towers and adding the boss 302 gussets to the towers near the upper control arms. My goal is to have a nice quiet (as quiet as a convertible can be) good handling road car. The mods must be as invisible as possible.

Thanks for posting the question and for the answers! I am going to go with the suggestions here about the subframe connectors and then change the rear springs if necessary.
I sprayed the lizard skin on my 71 convertible to help keep it quiet. It wasn't hard to do, kinda fun really.
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#8
Make sure your door hinges and lock pin are tight and use new door seals. I upgraded the size of my door bushings and replaced everything else. It still flexes the body but it is more like a flex rather than a big rattle when I go over RR tracks.
Tight doors make a big difference and doesn't alter the car. Cheaper too.
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#9
Thanks for posting the question and for the answers! I am going to go with the suggestions here about the subframe connectors and then change the rear springs if necessary.
I sprayed the lizard skin on my 71 convertible to help keep it quiet. It wasn't hard to do, kinda fun really.
[/quote]

Do you like the lizzard skin compared to Dyna-Mat?
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#10
The convertibles came from the factory with an extra support plate about halfway back and under the driveshaft. It's rectangular and without looking, its about 18x24 inches (just a guess). You might want to make sure it's still there and someone didn't' leave it off after servicing the u-joints, exhaust, or trans. I know on mine it's always a pain in the rear to keep the exhaust pipe from rattling against it. Just a thought!

Mike AKA Ole Pony & Rare Pony

Our current Mustang garage/driveway
1973 Mustang Convert - Bought in 1974 - Still have it!
2004 Mach 1 Oxford White Auto, Bought Sept 06
2004 Mach 1, Azure Blue, Bought it Sept 09
2001 Mustang Bullitt - Dark Highland Green, Bought It Sept 29th, 07
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