FAQs & Tech Tips

MM News

NASA Racers! MM will support NASA road racers with $1,000 contingency prizes for the American Iron, American Iron Extreme, and Spec Iron at the 2019 National Champions. You must register to be eligible.

New! Read the article Maximum Motorsports Tames Fox & SN95 Mustang Rear Suspensions on FordMuscle.com.

MRT Exhaust! MM now offers premium MRT cat-back exhaust systems for 1996-2004 Mustangs.

New! for Street & Strip Mustangs! Big-bore rear wheel cylinders for 1979-1993 Mustang with 9" drum brakes. Improves braking when running big rear tires and front skinnies, and/or different OEM front brakes.

New! Swapping a Coyote into a Fox Mustang? MM's Hydroboost Conversion Kits allow easy installation of a 1996-2004 Mustang Hydroboost power brake assist unit into a 1979-1993 Mustang.

New! Swapping an IRS into your Fox Mustang? MM makes it easier with a brake line kit made just for this conversion. Bolts-in, with no cutting or flaring of brake lines. Designed to fit standard IRS brake hoses.

New! MM's billet aluminum Pedal Box Spacer for Fox Mustangs. Replace the breakage-prone OEM plastic spacer when converting to manual brakes or Hydroboost.

Canadians! Please read the latest about ordering from Canada/shipping to Canada.

We've posted the parts list and link to the video of MM's Mustang in /DRIVE Tuner car Shootout

Spring Rate Recommendation Request

  • As a service to our customers purchasing coil-over kits directly from Maximum Motorsports, we'll make a recommendation specific to your particular Mustang and its usage. Just answer the questions below.
  • Required: You must purchase MM Tech Services before submitting this form.
  • If you don't buy direct from MM, ask for tech support from wherever you buy your MM Coil-over Kit.
  • Please answer all questions. The more accurate and complete your answers, the faster we can give you a response. We also need to know if you plan to make any changes in the near future, such as adding a torque-arm, changing tire sizes, etc.
  • Failure to answer all of the questions will prevent us from being able to recommend the optimum springs for your Mustang and your driving situation.
  • A response may take up to 5 days; the MM Engineering Team works during regular business hours, M-F.

Follow these instructions:

  1. Please copy and paste everything below into the email "Message" field on the Contact Us page.
  2. Type your answers on the same line as each question being answered.
  3. For those questions regarding items you would like us to make a recommendation for, answer with "Please recommend."
  4. Select "Tech Department" and then click "Send."

Got a smart phone?

  • Your phone may not let you complete this simple task.
  • You may need to copy and paste into a document first.
  • You may need to use a desktop computer.

Copy and paste everything below the line.

You must purchase MM Tech Services to get the required MM Web Order Number (MM website purchase) or MM Invoice Number (purchase by phone) before submitting this SRRR form. Forms submitted without an order number or invoice number will be ignored.

Questions about solid-axle equipped 1979-2004 Mustangs:

0)What is your Web Order Number or Invoice Number?
1) What year is your car?
2) What model is your car? (Mustang, T-Bird, etc.).
3) What submodel is your car? (GT, GTS, LX, Cobra, etc.).
4) Is it convertible or hardtop?
5) What is the brand and model of the front tires?
6) What is the front tire width?
7) What is the front wheel width?
8) What is the brand and model of the rear tires?
9) What is the rear tire width?
10) What is the rear wheel width?
11) What is the brand and model of the front struts?
12) What is the brand and model of the rear shocks?
13) Are the front springs in the stock location, or coil-overs?
14) What are the front springs? (ex: H&R 51650.88, 325x10" coil-over).
15) Are the rear springs in the stock location, or coil-overs?
16) What are the rear springs? (ex: H&R 51650.77, 225x9" coil-over).
17) What is the front swaybar? (ex: stock, Eibach #3518.310).
18) What is the rear swaybar? (ex: stock, Eibach #3518.320).
19) What spindles are installed? Include the year if they aren't the originals. (ex: stock original, 1999 Mustang, 1987-93 V8)
20) What front control arms are installed? (ex: stock Fox, stock SN95, MM Forward-offset SN95).
21) What is the approximate maximum engine torque output?
22) What is the weight of your car? Give us the individual corner weights, if available. If no measured weight is available, list anything done that significantly affects the car's weight from stock, either adding weight or removing weight. (ex: carbon fiber hood, huge stereo in the trunk, etc.).
23) Does your car have a lateral location device? (Panhard bar or Watts Link).
24) If yes, which one, and who manufactured it?
25) What rear lower control arms are installed? If aftermarket, list brand and model.
26) What type of bushings or bearings are at each end of the lower control arms?
27) What rear upper control arms are used, if any? If aftermarket, list brand and model.
28) What type of bushings or bearings are at each end of the upper control arms?
29) Does your car have a torque-arm?
30) If so, what brand and model?
31) If not, do you plan on installing one soon?

Tell us about how you drive your car.
It's very important that we understand how you use your car and what type of performance you want from it.

a) Is it only street driven?
b) Drag strip use only? (trailered to the strip).
c) Road course use only? (trailered to the track).
d) Street/strip? (Street-driven and also on the strip).
e) Street and autocross/road course?
f) Would you like us to recommend spring rates for a specific purpose? (ex: drag racing, autocross, open-tracking, road racing).
g) If your car is primarily street driven, how important to you is ride quality?
h) Is there anything else you think we should know?
i) What is your name?
j) What is your email address?