MM News

MM Coronavirus Update

We’re changing our phone hours to 9:00 AM to 3:00 PM Pacific Time (Monday-Friday, excluding holidays) so we have more time to process orders and get them out to you.

Please be aware
Our supply chain is suffering major pandemic-related disruptions. Many of our suppliers shut down for a time, and like us are operating with reduced manpower. Meanwhile, demand for MM products has skyrocketed. Thank you! We’re a small company and we regret our website isn’t fancy enough to inform you of back orders when you buy something. Please understand that we’re working as fast as we can to fill your orders.

UPS Shipping Times As of March 24, UPS no longer guarantees the shipping time for any shipment. i.e., expect shipping time to lengthen.

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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?