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Sub frame connectors

  • Thread starter Thread starter Moondog2178
  • Start date Start date Mar 27, 2024
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Moondog2178

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Hi all, I’m looking to do my first mod on my 89 LX 5.0 convertible. A few here recommended sub frame connectors to stiffen up the ride. My mechanic said the same thing and flowmaster 40 series to make it sound the way it’s supposed to. Can anyone send me links for which ones to buy? Mechanic told me to use summit racing to purchase them from. Just want to make sure I buy the right ones. Came across these.
 

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Warhorse Racing

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  • Mar 27, 2024
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You'll be better off using subframe connectors that have a crossbar that bolts under the seat. I use Stifflers subframe connectors (and their FIT System) on my 2000 GT convertible autocross car. I've been very impressed with the quality of every Stifflers part I've purchased. The Stifflers subframe connectors are also much less expensive. See the link below. Make sure to read the note about 1983-1993 Convertible models needing "brace modification."

https://lmr.com/item/STF-SFCM01/Stifflers-Subframe-Connectors-Mustang-79-04-SFCM01
 

Moondog2178

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Maximum Motorsport makes a similar connector. More expensive though. Thanks
 
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Moondog2178

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Warhorse Racing said:
You'll be better off using subframe connectors that have a crossbar that bolts under the seat. I use Stifflers subframe connectors (and their FIT System) on my 2000 GT convertible autocross car. I've been very impressed with the quality of every Stifflers part I've purchased. The Stifflers subframe connectors are also much less expensive. See the link below. Make sure to read the note about 1983-1993 Convertible models needing "brace modification."

https://lmr.com/item/STF-SFCM01/Stifflers-Subframe-Connectors-Mustang-79-04-SFCM01
Click to expand...
I saw those on summit racings site but they didn’t have them in stock. I will get these. What does brace modification mean? Will my mechanic have a problem installing them
 

limp

wrap a little cheese around it and its a done
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Moondog2178 said:
I saw those on summit racings site but they didn’t have them in stock. I will get these. What does brace modification mean? Will my mechanic have a problem installing them
Click to expand...
You don't have to buy them from Summit... LMR has free shipping at around $100... Good people there...
 

Warhorse Racing

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Moondog2178 said:
I saw those on summit racings site but they didn’t have them in stock. I will get these. What does brace modification mean? Will my mechanic have a problem installing them
Click to expand...
I haven't used the Stifflers subframe connectors on a Fox Body Convertible, so I don't have personal experience with the brace modifications. The modifications are detailed in the instructions. Here's the PDF:

https://buystifflers.com/content/instructions/SFC-M01.PDF

The modifications appear to be straightforward, but they will add time (and cost) to the installation.
 

Moondog2178

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Warhorse Racing said:
I haven't used the Stifflers subframe connectors on a Fox Body Convertible, so I don't have personal experience with the brace modifications. The modifications are detailed in the instructions. Here's the PDF:

https://buystifflers.com/content/instructions/SFC-M01.PDF

The modifications appear to be straightforward, but they will add time (and cost) to the installation.
Click to expand...
I’m sure he’ll know what to do. He recommended putting them on and they do a lot of work with mustangs. Thanks for your help
 

bird_dog0347

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As far as suspension or chassis, I'd go with either Stifflers or Maximum Motorsports (and personally have both for my car). My SFC's are the MM full length powdercoated units and they are excellent with great install instructions. I've ordered thousands of dollars in parts from www.lmr.com and they are awesome with fantastic customer service, I'd highly recommend them.

MM set
https://lmr.com/item/MM-MMFL5PC/79-04-Mustang-Maximum-Motorsports-Black-Powdercoated-Full-Length-Subframe-Connectors

Stifflers Set
https://lmr.com/item/STF-SFCM01/Stifflers-Subframe-Connectors-Mustang-79-04-SFCM01

Optional but I would on a vert.
https://lmr.com/item/STF-WEBM01/Stifflers-Web-Brace-Kit-Mustang-79-04-WEBM01
 

85GTStangGuy

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Fyi, there are also other brands out there.... Steeda, Team Z, BBK, SVE, for instance.

https://lmr.com/products/79-93-Mustang-Subframe-Connectors
 

AeroCoupe

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Global West on both of my Foxes. I like how they install next to the stock subrames so I did not loose any ground clearance as both my cars are fairly low.

1979-93 Subframes, supports Parts - Global West Suspension Car Parts

Find and shop all the 1979-93 Subframes, supports car parts you need on Global West Suspension Car Parts.
www.globalwest.net

The seat supports are a must in my opinion no matter what brand you go with. Kenny Brown also makes one hell of a subframe connector system.

Extreme Matrix Chassis Support System 1979-1993 Mustang GT

Extreme Matrix Chassis Support System vastly improves your ride quality and handling and strengthens the unibody, reducing twist/flex. Lightweight, heavy-duty, low profile design. Great for high horsepower cars. Includes Kenny’s exclusive Double-Cross™ Subframe Connectors, Jacking Rails &...
kennybrown.com
 
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Mustang5L5

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The Max motorsports are the ones I would recommend although there are certainly over good ones

https://lmr.com/item/MM-MMFL5PC/79-04-Mustang-Maximum-Motorsports-Black-Powdercoated-Full-Length-Subframe-Connectors

These need to be welded on. Here's the install instructions

https://www.maximummotorsports.com/assets/install/pdf/chass_stiff/MMFL-5.pdf
 

Moondog2178

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85GTStangGuy said:
Fyi, there are also other brands out there.... Steeda, Team Z, BBK, SVE, for instance.

https://lmr.com/products/79-93-Mustang-Subframe-Connectors
Click to expand...
Thanks. I ended buying the stifflers SFC. Cheaper than MMs. Can the web brace kit be added later on if I feel I need it?
 

Moondog2178

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#13
  • Mar 28, 2024
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bird_dog0347 said:
As far as suspension or chassis, I'd go with either Stifflers or Maximum Motorsports (and personally have both for my car). My SFC's are the MM full length powdercoated units and they are excellent with great install instructions. I've ordered thousands of dollars in parts from www.lmr.com and they are awesome with fantastic customer service, I'd highly recommend them.

MM set
https://lmr.com/item/MM-MMFL5PC/79-04-Mustang-Maximum-Motorsports-Black-Powdercoated-Full-Length-Subframe-Connectors

Stifflers Set
https://lmr.com/item/STF-SFCM01/Stifflers-Subframe-Connectors-Mustang-79-04-SFCM01

Optional but I would on a vert.
https://lmr.com/item/STF-WEBM01/Stifflers-Web-Brace-Kit-Mustang-79-04-WEBM01
Click to expand...
Thanks. I ended buying the stifflers SFC. Cheaper than MMs. Can the web brace kit be added later on if I feel I need it?
 

Mustang5L5

That is…until I whipped out my Bissell
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  • Mar 28, 2024
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Moondog2178 said:
Thanks. I ended buying the stifflers SFC. Cheaper than MMs. Can the web brace kit be added later on if I feel I need it?
Click to expand...

Yes
 

limp

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Wouldn't the web bracing be something more for a track car? No doubt it works but seems like overkill for a street car?
 

bird_dog0347

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Moondog2178 said:
Thanks. I ended buying the stifflers SFC. Cheaper than MMs. Can the web brace kit be added later on if I feel I need it?
Click to expand...
Yep, not a problem to add later.

limp said:
Wouldn't the web bracing be something more for a track car? No doubt it works but seems like overkill for a street car?
Click to expand...
I think it's overkill anyway for the most part, but I can see how it might help on a vert. On a track car you're better off with a cage anyway.
 

BlakeusMaximus

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I installed the MM Subframe connectors 5-6 years ago and immediately felt a difference.
 
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Mustang5L5

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the ease in which you can jack a car up after install is worth the install cost alone
 
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qikgts

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Huge difference on my '85 when I had the full length subframe connectors and jacking rails/pinch weld braces/rocker reinforcements- whatever you want to call them- installed. Just more solid and rigid than foxen with subframe connectors only. It sure did make getting the car in the air fast and easy too.
 
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from6to8

There's suction so I used that end O_O
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Mustang5L5 said:
the ease in which you can jack a car up after install is worth the install cost alone
Click to expand...
is it not recommended to use the subframes to jack the car? I know back in the day this shop used to lift mine on a 2 post lift at the subframes I believe, IIRC
 
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