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BBK Bolt-On Subframe Connectors w/ Seat Supports (79-93 All)

Item 56220
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      Review & Installation Video

      The BBK bolt-on subframe connectors with seat supports are available for all '79 to '93 Fox body owners looking to reinforce their chassis to reduce flexing and twisting to improve handling and launches. This is for the guys not looking to go with some of the weld-on options but rather an easier installation with the bolt-on performance while it also comes with additional seat supports. Because of that, the installation is going to get two out of three wrenches on our difficulty meter which basically only requires a little bit of drilling. Not too bad in my personal opinion, but we'll talk about that later on. If you're a Fox body owner and you're wondering whether or not you need subframe connectors, the answer in short is ultimately yes. These uni-body Mustangs did fall prey a lot of times over the years to chassis flex and twist, and that was especially evident to the guys with higher horsepower cars doing a lot of drag launches spending time at the track with sticky tires especially because you can get that chassis flex. You could see evidence of this by your stress cracks by the seat mounting bolts or the A-pillars or even when you shut your door if it doesn't line up properly like it once did. This will connect your front and rear subframes of your car which not only strengthen the whole thing but more importantly reduces the risk of a chassis flex. They're manufactured out of a tubular or box steel with a powder coated metallic gray finish on top. It does also look cool under the car but it's more importantly going to help with corrosion and rust resistance. The materials and construction across the category are for the most part the same, so the biggest differences come into play with whether or not it's a weld-on option versus a bolt on for ease of use or the length of the subframe connectors altogether. These are a full length option, but if you're running an all out drag car you might want to invest in some of the even longer ones like Maximum Motorsports or Steeda to really benefit you in your fields. These are going to be slightly more expensive than the entry level weld-ons running around 150 bucks which in my personal opinion is still a very great price. Some of the other ones that are a little bit more expensive will be the longer options out there, but you want to keep in mind this does have the ease of use and it even includes additional seat supports so it does give you a lot more value here. The installation is not too bad overall from start to finish. I think you can get it done in about an hour or two at the absolute maximum in the garage or driveway at home. You want to have a drill and three-eighths drill bit on deck because there is a little bit of drilling involved as well as a ratchet and socket set, a torque wrench, a jack and jack stands or a lift and a pole jack if you have access to one. Kick things off by getting the Mustang in the air and supported on jack stands. You want to make sure you're jacking up the rear axle and the front control arms just to make sure you're pre-loading the chassis properly. Place the subframe connectors over the front and rear subframes making sure they're flat and contoured with the floor pan as well as making sure the slants are facing front. You do have the option to tack weld this into place, but a lot of guys try to avoid that since it is a bolt-on option. I would recommend sticking the bolt through one of these holes and securing it with a nut on the other side just to hold it into place while you do some drilling. Break out the drill and three-eighths drill bit to go through the subframe connectors and the subframe. Once that's taken care of you can secure it into place with all the hardware and torque it down to 25 to 35 foot-pounds. The seat supports will just go through the pre-existing seat studs, but it might need a half inch washer in case there's any gaps so you can torque those down to those pre-existing holes in the bracket. That just about does it for the overview and install. If you're the owner of a '79 to '93 Fox body Mustang, you might want to check out the BBK bolt-on subframe connectors with seat supports. You can find them right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Full Length Subframe Connectors
      • Eliminates Chassis Flex
      • Bolt-On Design
      • Boxed Steel Construction
      • Charcoal Gray Powder Coated Finish
      • Seat Mounting Brackets
      • Fits All 1979-1993 Mustangs


      Eliminates Body Flex. Subframe connectors are one of the first modifications that should be done to any uni-body vehicle. A set of BBK Performance subframe connectors will add structural integrity to stop power robbing chassis flex and improve responsiveness and handling.

      Bolt-on Design. These BBK Performance Mustang subframe connectors bolt up using existing factory mounting points with no welding, cutting or modifications required for a straight forward installation. Can be welded in place for maximum strength.

      Boxed Construction. Manufactured from super strong boxed steel, this Mustang subframe connector features “seat mounting brackets for additional strength and is completed in a metallic charcoal gray powder coated finish for durability and corrosion resistance.

      Application. These BBK Performance Bolt-On Subframe Connectors are designed to fit the 1979 to 1993 Mustangs, including the LX, LX 5.0, GT and SVT Cobra models. Technical Note. Some Cobra and convertible models will require removal of front bracket on the subframe connector to clear the transmission cross-member.

      Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 Details

      MPN# 2542

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (22)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 22 customers

      Installation Time: Afternoon

      • January 30, 2020

        5 1990 GT - Jesseb80

        Sub frame connectors

        Super fast shipping and pretty simple to on took about 2 hours

        Helpful (0)
      • May 28, 2019

        4 1988 GT - Bowtieguy

        Great bolt ons!

        So easy to install, even a Bowtie guy could do it.

        Helpful (1)
      • September 12, 2018

        5 1989 LX - AntonioA Installation Time: Afternoon

        Bbk bolt-On Subframe Conectors

        A little tedious work, but they are worth it! if you are installing this by yourself take your time and have patience

        Helpful (7)
      • June 21, 2018

        5 1988 GT - GarryT Installation Time: Afternoon

        Easy Install

        It took a few weeks waiting for the shipment since the factory was running behind. They look good and are pretty much a straight forward install AFTER removing the mid-pipe to make room for your drill. Oh and be careful on the passenger side when you’re drilling to avoid putting a hole through the brake lines.

        Helpful (6)
      • May 05, 2018

        5 1990 LX - DarriusP Installation Time: Afternoon

        Best first mod for body

        The body is one with itself. There’s less body roll after installing these. Great would recommend these for one of the first mods

        Helpful (7)
      • January 20, 2018

        5 1989 LX - MarcialV Installation Time: Less than 1 Hour


        Super easy to install car handles way better and throttle response on piont

        Helpful (5)
      • January 17, 2018

        5 1986 Other - KelleyJ Installation Time: Afternoon

        Great upgrade

        They took a little more work on my 86 GT convertible, but well worth it. You have to remove the bracing plate at the rear and cut the corner to fit around the new connector and reattach with rivets.

        Helpful (5)
      • October 05, 2017

        4 1990 LX - TimM Installation Time: Afternoon

        In pursuit of a stiff chassis

        Good product overall. Note that if you plan on bolting these on, you'll need to remove your exhaust to drill holed through your subframes. I ended up bolting the seat support and welding the ends to the sub frames.

        Helpful (8)
      • September 22, 2017

        5 1993 GT - MarkS Installation Time: Afternoon

        bolt on frame ties

        Watched the video on the do's and dont's of the install. I have long tube headers so I had to take the H pipe off and let the exhaust hang to gain access to the drill points on the inside of the frame. Had to remove a couple of brake line fasteners and gently re bend the lines to accomodate the frame ties. It took about 2 hours and was very simple. Looks fantastic and the ride is noticebly different. I also seem to hook up when launching a bit better. Great product ...

        Helpful (5)
      • July 02, 2017

        5 1991 GT - MichaelF Installation Time: Less than 1 Hour

        Make this your first mod

        Every fox needs subframe connectors. These look great and are very easy to install

        Helpful (6)

      Questions & Answers (1 answers)

      1 Top Rated Question

      So will these fit my 1991 LX convertible with minimal hassle.

      • You should not have any issues on the 91 LX models no.

      Helpful (0)
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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) subframe connectors

      Tech Specs

      Will It Fit My Mustang

      • GT - 87, 88, 89, 90, 91, 92, 93
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Other - 79, 80, 81, 82, 83, 84, 85, 86

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