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Ford Performance Lowering B-Springs (79-04 All, Excluding 99-04 Cobra)

Item 50151
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      Review & Installation Video

      Hey, guys. Adam here with Today, I'm bringing you a detailed overview and installation of the Ford Performance Lowering B-Springs, which are available for all '79 to '04 GT, V6, and Mach 1s, as well as the '93 to '98 Cobras of both the coupe and convertible. In this video, I'll be going over what you can expect, as far as the drop in ride height from the lowering spring from Ford Racing, as well as its performance and benefits to your suspension and handling. I'll top it off with the installation, which I'll let you know up front here, gets a two out of three wrenches on our difficulty meter. Not the hardest job in the world, but it does require a little know-how, a little patience, and maybe a helping hand if you have one on deck.The Ford Performance Lowering B-Springs, which I have here today, will be for any '79 to '04 Mustang owner, who's looking to lower the center of gravity on their pony in order to get a more aggressive ride stance. While also improving greatly their suspension and handling performance with a progressive spring rate, like these. Obviously, when adding a set of lowering springs to your Mustang, you're lowering the center of gravity which, of course, will then, in turn, improve your suspension and handling performance, while also giving you an aggressive stance, depending on how low you go with the drop.So the first thing I wanna talk about right off the bat is, of course, how low are you gonna go when adding the B-springs from Ford Performance to your Mustang. Now, with the Fox Body '79 to '93 Mustangs, you can expect a 7/8 of an inch drop in the front and a 0.5-inch drop in the rear. Hearing those numbers, not too big of a drop overall. But lowering that center of gravity, even the slightest, will improve the handling performance of your Mustang.Now, as far as the SN95 and New Edge is concerned, all '94 to '04 Mustangs will drop 1-1/8-inch in the front, and of course, 3/4 of an inch in the rear. Again, not the biggest drops in the world, but a little bit bigger than the Fox Bodies. Either way, I want you to rest easy knowing that all of these drops for your Fox Body, SN95, or New Edge will clear, in fact, the stock wheels, as well as aftermarket wheel and tire kits you might have gotten from, in addition to the drop in right height, I wanna talk about the performance benefits you can expect. But I also wanna point out, Ford Performance offers a couple of different letter springs out there on the market, such as the B-springs we have here, but also C-springs and G-springs. Now, the differences in these springs might not be so obvious when you're checking it out yourself. So of course, I wanna point that out for you and explain the difference between the three, so we can help you make your decision a little easier.Now, the easiest one to point out is going to be the G-spring from Ford Performance, because it has a different ride height than the C and B-springs, which will be the exact same. The G-springs will drop your car a 0.5-inch in all 4 corners, whereas the C-springs and the B-springs we have here will drop it exactly what I said just a little bit ago in this video. Now, of course, the only difference between the C-springs and the B-springs is going to be the spring rate.If you're looking at these B-springs, you can expect a progressive spring rate. Now, progressive just basically refers to a normal spring rate, normal driving conditions, a pretty normal feel when you're driving it on the road, maybe a daily driver or commuting to work. And of course, it will get a little bit stiffer when taking those hard turns. It kind of adapts to those harder driving situations. That basically allows the spring to get a little bit more comfortable around those turns and adapt to that hard driving or cornering situation.Now, on the other hand, there is the C-spring that Ford Performance offers, which is going to have a standard spring rate. Standard just means it's basically linear and doesn't adapt to any different driving situation. So it allows the driver to more accurately predict how the springs will react in each certain situation. After all, it just comes down to what exactly you're using your Mustang for. Both of these springs are good for street driving and track driving, just one a little better than the other. Again, it comes down to your personal preference. The ride height will be the exact same between the two, but the spring rate is going to be very, very different.Now that we got that out of the way, I wanna talk about the pricing because it will differ, as well. Now, the B-springs we have here, with the progressive spring rate will come around the $200 mark. Now, if you're interested in a more linear standard spring rate, like the C-springs, that'll come in a little bit less at the $150 mark. If you'd like the G-springs to drop a 0.5-inch in all 4 corners, you're looking at about $220. Overall, just down to your personal preference, how much you wanna spend, what kind of spring rate you're looking for, and how low you want your Mustang to go.Now, the good thing about almost every single spring, from the Fox Body all the way up to the New Edge and '79 to '04 Mustangs, the installation for almost any spring in any brand is almost always gonna be the exact same. You're gonna wanna have a little bit of know-how on deck, or a helping hand if you're not too sure of the process. As far as the process goes, it's not the hardest job in the world. But it does require a little bit of patience and a little bit of caution.Now, as far as tools are concerned, if you are tackling it yourself, a ratchet and a simple socket set on deck, a jack and jack stands, or a lift if you have one, and a pry bar to help get those dusty springs off. If they're the factory options, they've been there a pretty long time, I'd imagine. Now, as far as timing goes, expect to have it done in about two hours, and it'll get a two out of three wrenches on our difficulty meter.To kick things off, we'll start at the rear of the Mustang, of course. You wanna jack it up by the rear end, remove one of the wheels, and then I'm gonna say you're gonna have to jack up the pumpkin or the differential housing right in the middle to relieve the tension on the shock bolts. From there, with the pumpkin up in the air, you wanna remove the bottom shock bolts from that shock tower, and of course, just lower that pumpkin down ever so slightly, or lower the differential housing until the spring tension is relieved.At that point, you can take the spring out using that pry bar, or just bring it out by hand if it's coming out pretty easily. At that point, swap it out with the B-springs, put everything back together in the reverse order, and you're good to go. Switching over to the front of the vehicle, you'll jack up the front end, of course, remove one of the wheels, support the vehicle under the lower control arm. You wanna jack that up to remove the tension, just like we did on the differential pumpkin on the back.Once that's jacked up, remove the sway bar end link, the bottom strut tower bolts, and then, of course, just lower that control arm down until the spring is removed. Once the spring is removed, pop in the B-springs, repeat the process in the reverse order, and you're good to go. Overall, about two hours' worth of time in the driveway at home, and a two out of three wrenches on our difficulty meter.Just to wrap things up, guys, if you're the owner of a 1979 all the way up to '04 Mustang, whether it's a coupe or convertible, you might be looking to lower the center of gravity on your Mustang to get a more aggressive stance and improve the handling performance. If you're looking for a progressive spring rate, you might wanna check out the Ford Performance B-Springs we have here, which are available at

      Product Information

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


      • Aggressive Stance
      • Lowers Center of Gravity
      • Improves Handling
      • Progressive Spring Rate
      • 1979-1993 Estimated Drop: Front 7/8"; Rear 1/2"
      • 1994-2004 Estimated Drop: Front 1-1/8"; Rear 3/4"
      • Fits 1979 to 2004 Mustangs, Excludes IRS
      • Clears Stock and Aftermarket Wheels & Tires.


      Improves Handling. These Ford Racing "B" Springs will lower your Mustang approximately 1" giving it a more aggressive stance and a lower center of gravity greatly improving your pony's handling over the factory springs.

      Aggressive Stance. Adding a set of lowering springs to your Mustang can greatly improve its appearance by getting rid of that "4x4" look that it came with from the factory for a more aggressive stance.

      Clears Stock and Aftermarket Wheels & Tires. These lowering springs were engineered to be compatible with your factory size wheels and tires, as well as AmericanMuscle's pre-configured wheel and tire combo kits (specific to your generation), to assure proper clearance with no rubbing issues.

      Application. The Ford Racing B Springs fit all Mustangs from 1979 to 2004, except the 1999-2004 Cobra's with Independent Rear Suspension (IRS). Lowers 1979-1993 Mustangs approximately 7/8" front; 1/2" rear. Lowers 1994-2004 Mustangs approximately 1-1/8" front; 3/4" rear.

      Technical Note. These springs will not fit 1999 to 2004 SVT Cobra's with Independent Rear Suspension (IRS) or GT Mustangs converted to IRS.

      Spring Rates:

      • Front: 425/530 lb/in.
      • Rear: 200-300 lb/in.

      Fitment: 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 2004

      MPN# M-5300-B

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (83)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 83 customers

      Installation Time: Full Day

      Installation Cost: $100-$250

      • March 26, 2020

        5 1987 GT - Jason Installation Time: Full Day

        B Springs on 87' Convertible

        I installed B Springs on my 87' Convertible and the install isn't too bad but will definitely require a spring compressor for the front springs. The ride is much better and it looks great too.

        Helpful (0)
      • January 04, 2020

        5 1986 Other - jett2502 Installation Time: Afternoon

        nice product

        Is as advertised regarding drop in a fox body. Install was easy using the MMT-8 tool.

        Helpful (0)
      • January 02, 2020

        5 2004 GT - Alex777 Installation Time: Afternoon

        Ford Performance Springs

        Paired these with Koni shocks/struts... ride is much better than factory suspension with 70k on it. drop wasn’t too crazy but i like it, not into the SLAMMMED BOYZ look. but to each their own

        Helpful (0)
      • September 24, 2019

        5 2004 GT - nickd Installation Time: Afternoon


        Springs are great go right in and feel better than stock. Drop height just as advertised don’t really scrape. MUST BY INSULTERS DO NO REUSE THE OLD ONES!!!

        Helpful (0)
      • August 22, 2019

        5 1998 GT - TSE Installation Time: Weekend

        Excellent Upgrade from Stock

        I picked these up last minute as my stock one were rusted worse than I thought (I was upgrading nearly everything else). Between these and the other parts I replaced, my suspension is far more stable, and the stance is much nicer.

        Helpful (1)
      • June 02, 2019

        5 2004 GT - LTHL281 Installation Time: Weekend

        This is a great upgrade

        My 04 GT was my daily for 7/9 years, and had 186K on the stock springs and shocks. I paired these with the koni orange shock and strut kit. Install is pretty straight forward but the front springs can be quite difficult to get in. Have a helping hand and a few pry bars ready. The difference is amazing. Car is lowered pretty much as advertised. The car feels so much more solid in any driving situation. Very pleased and would recommend to anyone just wanting to freshen up the suspension and not wanting a drastic drop.

        Helpful (1)
      • February 18, 2019

        5 1993 LX - MarkJ

        Ford B Springs Review

        Great product. AMR has the best prices on Ford B springs around. Drops the car just enough to look lower than stock, but not too aggressive where it's bottoming out or negatively affecting the ride quality. Also, same spring rating as the stock springs.

        Helpful (2)
      • January 29, 2019

        5 2004 GT - JasonB Installation Time: Afternoon

        Rides like new

        Night and day difference from stock with 100k. Handles and rides superb. Lowers about an inch and closes gap in front wheel well. Ride is a bit firmer than stock and corners nice. Handles bumps in road really nice. Installed in driveway with a jack and two stands, rears just unbolt all 4 shocks, front unbolt away bar and shock requires pry bar to get seated. Great small investment to improve your ride dramatically.

        Helpful (2)
      • January 21, 2019

        5 2000 GT - JesusC Installation Time: Weekend

        Perfect suspension spring

        This spring is great not to low not to high ride quality is excellent when it comes to turns it is great you have total control in a higher speed a Totally different car I feel it rides smoother than the stock springs.

        Helpful (2)
      • January 16, 2019

        5 2000 V6 - JonnR Installation Time: Afternoon

        Lowering Spring Install

        Fit and finish are excellent. Pretty easy to install. Lowered the car just the right amount.

        Helpful (3)

      Questions & Answers (24 answers)

      5 Top Rated Questions

      Will i need CC Plates with these springs?

      • Caster Camber plates are not required when lowering your Mustang however it will improve the handling and drivability once installed. When lowering the car you change the geometry of the vehicle and since the car will sit lower, adjusting the angle of the wheel/tire will improve the way the vehicle will drive especially when using for performance applications.

      Helpful (4)

      Does changing the isolators effect the lowering distance

      • Adding isolators with the Ford Performance Lowering B-Springs will not affect how much the car is going to drop.

      Helpful (3)

      does the v6 engine weight compared to v8 make a difference in the distance lowered I have a 2000 v6 convertible

      • The difference in weight between the engines will not make much of a difference when it comes to the Ford Performance Lowering B-Springs. They will lower the car approximately 1-1/8" in the front and 3/4" in the rear.

      Helpful (3)

      are " factory specs" the same before lowering springs and after. My alignment guy wasn't sure if his machine would work accurately with springs lowered. It sounded like it would do an automatic calibration. Any thoughts. I am a little confused and would like to be sure.

      • We highly suggest getting an alignment done after installing the Ford Performance Lowering B-Springs. Whenever changing suspension components, the alignment can slightly change. An alignment shop will be able to get the car back to factory alignment.

      Helpful (1)

      will these springs be a good combo with the sr shocks and struts kit?

      • The Ford Performance Lowering B-Springs would work very well with the SR Shock and strut kit.

      Helpful (1)
      10 More Questions
      Will these work on a Fox convertible? 1 answer
      I spoke to a dealer about alignment after the installation. He said his 4 wheels alignment set up restores to factory specs. Would this be An acceptable alignment after installing these B springs? 1 answer
      i have a v6 convertible with 16 inch wheels, will these springs work for my car since Im planning on lowering it but still keep good ride quality. 1 answer
      Hey AM team. I am after the Ford Lowering Springs. I'm from NZ so shipping them over is heaps, but I am in US in early April so can get them sent to my sister and I bring them back but need to know the weight what all 4 will be. My bag limit is 44 pounds. cheers. 1 answer
      Will the springs we took off of 2010 Mustang fit a 1998 Mustang 1 answer
      What shocks and struts would you recommend with these springs? 1 answer
      I have an 03 v6 with 18x8 wheels off of a 2015 mustang. Would these springs work, or would I not have enough clearance? Tire width is 235/50 1 answer
      Hello I have an 04 GT convertible. Would these springs be a better choice than the G springs? I do not want to lower too much for my catted x pipe hangs a bit low. Would I need casters with these? Would it be wise to change out the quad shock and if so do you only carry the Bilstein? Would the Koni str shocks be a good choice for shocks / struts? Just trying to get a little more performance out of the car. Thank you for any help.. 1 answer
      So I'm trying to lower my 1985 v6 convertible as little as possible. would this be a good choice? 1 answer
      Fox body: What I be better off with the lowering springs manufactured by Ford Racing or Eibach Pro Sport series. I'm going to run 17" wheels with 245 tires. Price difference is not an issue, but bottoming out is as well as overall ride quality. Car has Koni adjustable Structs / shocks on it and it's mostly used for street / strip. 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (4) Lowering Springs

      Tech Specs

      Springs Specifications
      Spring Rate: Front: 425/530 lb/in.
      Rear: 200-300 lb/in.
      Usage: Street
      Year: 1979-2004 Model: All except IRS Cobra's
      Progressive or Standard: Progressive Estimated Drop: 1979-1993: 7/8"F / 1/2" R
      1994-2004: 1-1/8"F / 3/4" R

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