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The Driveshaft Shop Half-Shaft Axle Upgrade; Left Side; 800 HP Rated (15-20 All)

Item 384852
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      Review & Installation Video

      What's up, guys? Stephanie with, here with these upgraded Halfshaft Axle Assemblies from The Driveshaft Shop for 2015 and up Mustangs. The upgraded halfshafts are going to be a good option for any S550 owner that's worried about running into trouble with the factory halfshafts. Have you been hitting the drag strip at all? Or even if you've just been keeping an eye on what's been going on, then you're probably aware that the S550 stock halfshafts are a weak point, and they need to be upgraded, even if you currently have minimal mods. All it really takes is some time with a drag radial, and you're out of the lanes or off the streets until you're fixed up. DSS gives you two options for the 8.8 IRS Rear, depending on what you need in a halfshaft. The first upgrade over a stock is actually going to be these halfshafts here that are rated up to 800 horsepower, so you have a lot of room to grow into these if you plan on some more mods down the road. And let's face it, more mods is usually always an option. The other option from DSS are halfshafts that are rated up to 1400 horsepower if 800 isn't enough for you, and you're building something serious. There are some pretty cool things going on with both of these options, though, since DSS pretty much upgraded every component of the halfshaft. And I'm going to try not to geek out too much here, but I'll start with the material that's used for the center bars. This is a 300M alloy steel, which is a modified steel that has a high hardenability, strength, and toughness. Another cool thing here is that the center bars are done with a C&C spline rolling process. DSS did this because rolling the spline instead of using material cutaway is a way of compressing and forging the spline making it stronger. Next is the whole CV area, from the billet CV mounts to the joints themselves, to the billet chromoly cages and raises, and even an upgraded grease and boot, high durometer neoprene boot to be exact. Now all of this is a lot of technical talk, but basically, these are some seriously beefy halfshafts that are made to handle abuse, and this isn't coming from just me. There are some record holding cars out there that are testing these products. These are a couple pounds heavier than the factory halfshafts, so they do cause a small weight gain, but I think that the benefits outweigh the weight gain here. Something like this is needed in order to be reliable on the street, or at the dragstrip, or if there's a lot of hard driving going on. So looking at price, the 800 horsepower rated halfshafts are going to cost just under $600, and if you want to go a step up from that and hit up the 1400 horsepower option, you're looking at about $200 more. Ford racing is the only other company out there right now that is competing with the DSS halfshafts, and they do have a couple of different features, so feel free to check those out too, but they are more expensive. The install can be considered difficult with this one, and I'm going to call it a three out of three wrenches on the scale. I would take this to a shop for the install if you don't have any prior experience in this area since it does involve a lot of work. But if you do decide to tackle this yourself, a lift and a second set of hands can go a long way in helping you with this. You will need a handful of different sockets, wrenches, and miscellaneous tools, as well as a torque wrench, and you can plan on about an hour or two per side, depending on if you have some help, and are working off of a lift or not. Wrapping things up, the DSS Halfshaft Axles for the S550 Mustang are a beefy upgrade over the factory halfshafts when we look at both materials and construction. They're one of the only upgrades that are currently available, and they're rated at either 800 or 1400 horsepower. I'd suggest checking these out more online and seeing what you think for yourself. I'm Stephanie, and for all things Mustang, keep it right here at

      Product Information

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


      • Upgrade Halfshaft Assembly
      • Rated Up to 800 Rear Wheel Horsepower
      • 108mm CV Joint with Full 300m Billet Chromoly Cage
      • Ovaco 300M Alloy Steel Center Bars
      • Cold Rolled Splines - Stronger Than Standard Cut Splines
      • Left Hand - Driver Side
      • Sold Individually
      • Fits All 2015-2020 Mustangs with 8.8" IRS Rears


      Performance Upgrade. If your S550 Mustang is heavily modified, your factory half shafts might be too weak to take the additional punishment. But after installing Axle Half Shafts from The Driveshaft Shop you will be sure to get all your Pony's power and torque firmly planted to the pavement - where it belongs. The Driveshaft Shop half shafts are designed to handle up to 800 horsepower at the rear wheels.

      Superior Quality. Using their time-tested dependable 108mm CV joints that has a full 300m Billet Chromoly cage, The Driveshaft Shops Axle Half Shafts center bar is constructed from Ovaco 300M alloy steel for superior strength and features cold-formed rolled splines which are much stronger than standard cut splines. All this along with Neo HPCC1 grease and higher durometer Neoprene boots means these axles can handle just about anything you can throw at them.

      Application. This Driver Side Axle Half Shaft from The Driveshaft Shop is specifically designed for use on the 2015-2020 S550 Mustangs that are equipped with the factory 8.8" Independent Rear Suspension (IRS), including V6, EcoBoost and GT models. Sold individually.

      Please Note. The Driveshaft Shop Half-Shafts are built to order for our customers and because of this, there can be a 3 to 4 week lead time on orders.

      Fitment: 2015 2016 2017 2018 2019 2020 Details

      MPN# RA8505X4

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (41)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 41 customers

      Installation Time: Afternoon

      Installation Cost: $250-$500

      • February 02, 2020

        5 2016 GT - TownsendS Installation Time: Shop Install

        Heavy duty is always better.

        I have broken 3 axles. 2 driver 1 passenger. 1 at the track 2 on the street. My car is FBO, but with CJ intake I am shifting at 7745 rpm. they all broke going to 2nd gear. These axles feel a lot better. Feels stronger somehow. I skipped the GT350 axles and went for these.

        Helpful (0)
      • December 10, 2019

        5 2020 GT - MJR111 Installation Time: Shop Install Installation Cost: $100-$250

        Half Shafts

        Only installed yesterday. No problems. Go value for the price. My only concern is if I should have paid for the upgraded axels that are higher horsepower rated. Time will tell.

        Helpful (0)
      • October 09, 2019

        Review shared from The Driveshaft Shop Half-Shaft Axle Upgrade; Right Side; 800 HP Rated (15-20 All)

        5 2009 GT500 - VALLE Installation Time: Full Day


        de drive is amzing, 1 day your install, 800 whp its reall

        Helpful (0)
      • May 26, 2019

        4 2015 GT - Ankak1106 Installation Time: Shop Install Installation Cost: $250-$500

        This is worth the money!

        So I have the phase 2 roush 727 supercharger and was recommended to upgrade my half-shafts for power gains. I ordered through my local ford dealer and had them do the install. Well worth the money. I have talked to several people that have upgraded because they snapped their axle from the power gains. I can't speak for the 800hp rating that The Driveshaft Shop has given, but I'm very confident in this products ability to handle what I have done. I am looking forward to a bit more power in the future and we will see how well they hold up.

        Helpful (0)
      • April 10, 2019

        5 2018 GT - Jdwilliams240 Installation Time: Less than 1 Hour

        Axles are awesome

        Axles are built well. Not to hard to install if you have a lift and the right tools. Extra hands will be very helpful.

        Helpful (0)
      • April 03, 2019

        5 2016 GT - Jason Installation Time: Afternoon

        Holding 720hp just fine!

        They went in without a hitch. They Perform excellent. The only problem is I'm creeping up to that 800hp mark. Let's see how much they will really hold. These went on a 2016 Mustang GT Premium w/ The performance package. P1X Procharger w/ a 3.4 pulley. 14lbs of boost 720hp 552tq @ 5500altitude on 91 pump gas.

        Helpful (2)
      • April 03, 2019

        Review shared from The Driveshaft Shop Half-Shaft Axle Upgrade; Right Side; 800 HP Rated (15-20 All)

        5 2016 GT - Jason Installation Time: Afternoon

        Holding 720hp just fine!

        Went in without a hitch. They Perform excellent. The only problem is I'm creeping up to that 800hp mark. Let's see how much they will really hold.

        Helpful (0)
      • March 22, 2019

        Review shared from The Driveshaft Shop Half-Shaft Axle Upgrade; Right Side; 800 HP Rated (15-20 All)

        5 2017 GT - NathanielJ Installation Time: Afternoon

        Full send

        Definitely felt more heavy duty than the stocks. Also after a few play around launches, could be in my head but I felt like my car handled the torque a lot better and more sturdy. Not hard to install. Just an NA engine for now. Handles just fine.

        Helpful (0)
      • March 20, 2019

        5 2015 GT - RichardJ Installation Time: Afternoon

        Beefy and Great Fit

        Great Product... Easy to install... having a second hand to help you is great... My car rides smoother after replacing the factory axles.

        Helpful (0)
      • February 05, 2019

        Review shared from The Driveshaft Shop Half-Shaft Axle Upgrade; Right Side; 800 HP Rated (15-20 All)

        4 2015 GT - Charles27 Installation Time: Afternoon

        DDS Axles

        One of the best purchases I could have made for my car. They are really built heavy duty axles and gives a smooth ride for daily driving applications.

        Helpful (1)

      Questions & Answers (9 answers)

      5 Top Rated Questions

      So I have a whipple stage 2 sc. It aww ill make 730rwhp roughly when tuned properly,, will these be ok, or should I go with the next upgtaded shafts??? Please advise. Scott z

      • As long as you plan on keeping your car around that amount of power these shafts would be fine. However, if you plan to keep going we would recommend getting the next step up.

      Helpful (1)

      are these 34 spline go with new cast iron differental with lsd

      • The The Driveshaft Shop Half-Shaft Axle Upgrade will have 34 spline for the inner splines to match up to 34 spline differentials.

      Helpful (1)

      Anything else I need for the install? Or is it a direct replacement. Thank you

      • The The Driveshaft Shop Half-Shaft Axle Upgrade is a direct replacement for the factory half shafts and do not require anything additional for installation. Each Half-Shaft is sold separately and would need to purchase the right side as well. Down below I will include a link to an installation guide for the ford performance half-shafts:

      Helpful (1)

      I understand I need this if I'm using a PD supercharger, but if I'm running only 285 Nitto G2 tires in the rear, could I just get away without buying these and keeping traction control on for safety?

      Will these fit the 3.15 Auto differential gear housing?

      • Yes they will fit that 3.15 auto differential gear housing.

      Helpful (0)
      Post Your Question
      4 More Questions
      Will these fit the 3.15 Auto differential gear housing? 1 answer
      Is it considered ok to just replace the driver side LH , instead of replacing both ? since the driver side is the side that's always failing. 1 answer
      Can the axles length be custom made for our application. 1 answer
      hey. do i need to buy two, for the left and right side? or how do they work. thaks. 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Left Hand - Driver Side Half Shaft Axle Assembly

      Tech Specs

      Will It Fit My Mustang

      • Bullitt - 19, 20
      • EcoBoost - 15, 16, 17, 18, 19, 20
      • GT - 15, 16, 17, 18, 19, 20
      • GT350 - 15, 16, 17, 18, 19, 20
      • GT350R - 15, 16, 17, 18, 19, 20
      • GT500 - 20
      • V6 - 15, 16, 17

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