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

Market Price $181.99 You Save 12% ($22.00)
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  • Item 56220
  • MPN# 2542

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    Features, Video & Details

    • 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

    Review & Installation Video

    Review & Install 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

    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

    What's in the Box
    • (2) subframe connectors
    Installation Info
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    Will it fit my Mustang?

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    Customer Reviews (18) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Afternoon

    • Handling Improvement 4.75 4.8
    • Fit 4.6875 4.7
    • Bang For Your Buck 4.5625 4.6

    • 5/5

      Installation Time: Afternoon

      May 05, 2018

      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


      Year: 1990 Submodel: LX

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      January 20, 2018


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


      Year: 1989 Submodel: LX

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      January 17, 2018

      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.


      Year: 1986 Submodel: Other

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      October 05, 2017

      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.


      Year: 1990 Submodel: LX

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      September 22, 2017

      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 ...


      Year: 1993 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      July 02, 2017

      Make this your first mod

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


      Year: 1991 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      March 07, 2017

      Veryy satisfied

      As always american muscle delivers a good product fast and free shipping and good fit I just have it bolted in right now have to get gas for welder when it is complete I will post pic very satisfied


      Year: 1991 Submodel: LX

      Helpful (3)

    • 4/5

      October 13, 2016

      Installing sub farme connectors

      I bought these with the hope I could avoid welding but once I had them in place using the seat bolts, it was clear to me that I could not bolt them in place and have them hold. There is just too little metal, and drilling is quite a chore. I have a wire welder so using stainless wire I welded them in place. My Mustang was in very good condition so it probably not as noticeable a difference, but it does seem more stable in turns. Don't forget to paint over the weld spots so they do not rust out


      Year: 1988 Submodel: GT

      Helpful (3)

    • 5/5

      September 22, 2016

      Work great!

      These fit great but came with BBK Exhaust Bolts...weird? Was charged time by mechanic to get the correct bolts, etc. welded in and solid. Work great!


      Year: 1992 Submodel: Other

      Helpful (3)

    • 4/5

      Installation Time: Shop Install

      October 23, 2015

      grey subframe connectors

      The subframe have a nice, smooth paint finish and a decal on the side.I have a 1983 GT hatchback and they should fit without having to remove or lower mufflers.Haven't installed them yet, but should have enough room to drill holes for bolts( 2 front, 2 rear) with drill outside of car frame . A right angle drill or an adapter for a right angle chuck should have enough clearance for drilling.The subframe connectors support the 2 rear studs for the seats.I will have to cut or grind off as much of the top and bottom of the studs as I can get to.Then I will drill pilot hole and gradually increase size of hole with carbide drill bits to drill out remainder of the studs, like I did with seat belt bolts that were stuck in place . The directions say to just reuse the seat studs and tighten a nut to the bottom of them, but the stud probably doesn't stick out far enough to do that. A previous owner cracked the floor sheet metal below the outside seat stud .The floor pans just have a washer around seat studs, should have been designed with reinforcing steel like seat belt bolts.This is a fairly common problem with foxbody mustangs not having proper support for seat mount bolts .


      Year: 1983 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      October 21, 2015

      Subframe connector

      I just installed BBK subframe connectors on my 1986 Ford Mustang foxbody. The subframe connectors proved my handling and stability and helped the car grip to the road a little bit better, without body flex and twist. I would recommend BBK subframe connectors to anybody.


      Year: 1986 Submodel: GT Richmond Va

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      August 29, 2015

      bbk bolt on subframe connectors with seat mount

      The BBK sub-frame connectors are really easy to install and did'nt take a lot of time.I could tell the difference right away with the handleling no more body flex witch is really good. I recommand this product to friends and family.


      Year: 1992 Submodel: Other newberg oregon

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 13, 2015

      Perfect Fitment and product

      BBK always makes excellent products and this one is no different. These subframe connectors are a direct fit and had them installed in under an hour. The price is definitely great for the quality and durability of these connectors. I have recommended them to friends and will continue recommending them. Thank you to American Muscle and BBK for a great product.


      Year: 1991 Submodel: GT Albuquerque, NM

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      July 23, 2014

      great product!!!!!

      The subframe is really stable and solid I say it's worth every buck took me lesser than one hour to install it myself. I give it a 5 star!


      Year: 1991 Submodel: Other Stockton, CA, USA

      Helpful (4)

    • 4/5

      Installation Time: Weekend

      May 23, 2014

      BBK Bolt-On Subframe Connectors w/ Seat Supports

      Had to perform several adjustments to existing bracketry on our 90 Mustang GT convertible( I assume the brackets were do to convertible support requirements). Really tightened things up would highly recommend this product to your customers


      Year: 1990 Submodel: GT Johnstown, PA, USA

      Helpful (4)

    • 4/5

      Installation Time: Afternoon

      November 22, 2013

      like the fact it bolts to the seat studs also

      Looks like a very well made product and the finish. Install would have went more smooth if I had a lift and from it being lowered there were a few dings on the sub-frame I had to straighten first after that fit like a glove!!!


      Year: 1984 Submodel: Other Cortland, Ohio

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      October 20, 2013

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

      BBk is a great product for a mustang. Fitting its so very great . For the installation time 2-3 hours maximum. It's medium easy for the installation.This price it's more expansive but the fitting it's very great,


      Year: 1992 Submodel: Other Quebec, Canada

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      May 22, 2013

      Looks and work great

      Fit in nicely, instead of bolting in I had mine welded, seeing as I was having welding done to the floor pans already.


      Year: 1992 Submodel: GT Victoria, BC, Canada

      Helpful (3)

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