Maximum Motorsports Subframe Connector Full-Length Black Pair Mustang 1979-2004

Maximum Motorsports:
100% of 100


  • Full Length Weld On Connectors
  • 95% Stiffer Than Bolt Ons
  • Made of 1.5" X 2" .083" Tubing
  • Reduces Chassis Flex

Pair of Maximum Motorsports Black Full-Length Subframe Connectors for 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 and 2004 Mustangs.

Improve the handling performance of your 1979-2004 Mustang while strengthening your floorplan and beefing up that chassis with this Pair of Black Full-Length Subframe Connectors from Maximum Motorsports. As the originators of the full-length connectors concept, Maximum Motorsports has modified their original design, providing you with a superior upgrade that will enhance performance and provide longevity.

These steel tube reinforcements are 65" in length and have a durable black powder-coated finish. They're made of 1.5" x 2" x .083" wall thickness rectangular tubing. The thinner wall tubing is then used to lessen the overall weight.

This pair of subframe connectors will link the front and rear subframes together. The new design will see these connectors extend all the way from the rear lower control arm attachment point up to your Mustang's firewall. The increase in length and height of the tube will provide a more stiff result and increase the number of attachment points and weld area between the connector and chassis.

The subframe connectors feature seat mounting braces that attach to two of the four front seat mounting bolts. This prevents any chronic tear of your Mustang's sheet metal floor pan at the rearward seat mounts. The braces are welded to the connector tube during the mounting process so you can get a custom fitment to match your Mustang. Maximum Motorsports has also refined these braces for an improved fitment with a Torque-arm and reduced welding during installation.

Features and Benefits:
- Welded on Bottom of Mustang
- Steel Tube Reinforcements
- Reinforcement Plates at Each End
- Welded End Caps Seal Tube
- Improved Handling and Launching Capabilities
- Increased Comfort and Ride Quality
- Prevents Floorpan Damage

The reinforcing plates on these connectors will prevent flexing, while the welded end caps seal up the tube to prevent moisture from getting inside the connector to cause damage. You'll be able to enjoy this upgrade without worrying about any reduction in ground clearance since the subframe connectors do not hang lower than your Mustang's exhaust system (your lowest part).

These subframe connectors will significantly tighten up your chassis and reduce flex. This immediately improves your handling capabilities as the suspension loads say in the springs and dampers. You will also be able to get a quicker launch at the gate; when you hit the throttle, the engine torque will quickly transmit to the rear axle instead of being delayed by flexing the unibody first.

The reduction in chassis flex will improve how comfortable your ride is as irregularities from the road are forced to the suspension instead of the unibody. You'll be able to cruise over rough roads without the shaking and shuddering that can be a characteristic of factory Mustangs. Your front seats will be securely braced to the subframe connector tube and won't rock side to side due to floorplan flexing. 

Please Note: 1996-1998 Cobras must notch the transmission crossmember at the frame rails so that the subframe connectors can sit flush on the frame rails.

California Residents: Proposition 65 Warning

Installation Difficulty


Advanced skill is required for this installation.

Installation Videos

Video Transcript

Bill: We have Jack from Maximum Motorsports in our studio today. He brought this killer display with him. Jack handles high-level tech support as well as works with the engineers. He's going to tell us about some of the products they make for your Mustang.

Jack, this is probably our top-selling product. Your subframe connectors are probably on three-quarters of the car here, including my own. Tell us what makes yours different from everybody else's.

Jack: First of all, our subframe connectors are full-length, and I believe we're the first company to come out with these for a Mustang chassis. They extend in the front all the way to the front of the front frame rail, and in the rear all the way to the control arm mounting point for the rear frame rail. They have the most stiffness possible because they encompass the front floor pan and the rear floor pan over the largest area you can get.

Bill: You guys only make weld-on subframe connectors?

Jack: Yes.

Bill: Nothing with a bolt-on? There are companies that offer bolt-on ones, but weld-on is really the only way you're going to get true structural integrity.

Jack: It's not really practical to make a bolt-on subframe connector because if you, for example, run bolts through these tabs, when you tighten these bolts down, the thin-walled frame rail on the Mustang is just going to collapse, and as soon as it crushes, there's no clamp load. The thing is free to move around and just egg out the holes.

Bill: These are going to fit your ... The one model, I believe, fits '79 through '04, correct?

Jack: Correct.

Bill: Okay.

Jack: It fits all those years.

Bill: Are covered by one part number.

Jack: One particular piece.

Bill: Tell us about your bracing here in the middle.

Jack: This is almost the single-most important function of the subframe connector. The seats ... The floor pan in the Mustang has a large area where the rear seat is mounted with no bracing whatsoever.

Bill: Yeah, it's just right through the sheet metal.

Jack: It's right to the sheet metal. It's almost flat. There's no corrugation in it for stiffness, so bracing the rear bolts of the front seats is very vital. When you get in the car after they're installed, you back the car up out of the driveway, and two seconds later, you feet that the seat isn't moving anymore, and you don't feel like you're kind of in an ocean liner.

Bill: At that point, you're literally bolting your seat to the frame of the car ...

Jack: Exactly.

Bill:... which is going to be the best way to do it to keep it mounted where it needs to be.

Jack: Yes, keep the most stability you can get.

Bill: Excellent. Jack, we appreciate you coming out today. Thank you for telling us about your products. If you're looking for a high-performance suspension for your late-model Mustang, make sure you check out our selection of products from Maximum Motorsports.

Vehicle Fitment

This product will fit the following Mustang years:

Only registered users can ask/answer questions. Please sign in or create an account.
Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account