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Roush Heavy Duty Belt Tensioner (05-10 GT)

Item 400281
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      Product Information

      Features, Description, Reviews, Specs & Installation


      • Roush Performance Heavy Duty Belt Tensioner
      • ROUSH Embossed Logo
      • As Used In The 2010 ROUSHcharger Kits
      • Heavy Duty Construction
      • Permanently Sealed Bearings
      • Built for High-Performance Applications
      • Placement: Front
      • Direct Installation
      • Roush Limited Warranty
      • Fits All 2005-2010 Ford Mustang GT Models


      Proper Belt Tension. Is your 2005-2010 Mustang GT’s OEM or replacement serpentine belt slipping out of place or squealing? You need a Heavy Duty Belt Tensioner from Roush Performance. This Tensioner is designed to provide a suitable belt tension and will make your ride noiseless and more comfortable on the road.

      Heavy Duty Construction. Installing a Roush Heavy Duty Belt Tensioner is a recommended upgrade, especially if you have recently installed a Roush supercharger on your GT. It has a heavy duty construction that enables it to handle extreme rotational forces from the supercharger, making it ideal for applications such as racing. There’s more; Roush Performance builds its tensioners from industrial grade cast aluminum spring case for ultimate strength and durability.

      Genuine Ford Part. The Roush Heavy Duty Belt Tensioner is crafted to match your GT’s factory specifications. Also, it is made from OEM-grade materials thus giving it the ability to withstand aggressive driving styles without cracking or underperforming. Its permanently sealed bearings, similarly, guarantee long-term and dependable maintenance-free operation.

      Direct Installation. Since Roush Heavy Duty Belt Tensioner fits your Mustang’s factory specifications, installing it is relatively easy. You do not need to undertake any modifications to your GT. Basic tools are required to complete installation, and the process lasts approximately one hour.

      Warranty. Roush Performance backs its belt tensioners with a unique Roush Limited Warranty that covers manufacturer’s defects unless stated otherwise.

      Application. Roush Heavy Duty Belt Tensioner is designed to fit all 2005 to 2010 Ford Mustang GT models.

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      Roush 404225

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (19)

      Write a Review

      Ratings Summary

      4.5 out of 5 overall rating from 19 customers

      Installation Time: Less than 1 Hour

      • April 16, 2020

        3 2006 GT - 427r Installation Time: Less than 1 Hour


        Anything roush must have looks forward for the install change belt while your getting your belt off kill 2 stones with 1 bird lol

        Helpful (3)
      • March 18, 2020

        5 2003 Cobra - Trmn8r03 Installation Time: Afternoon

        2003 Cobra

        near direct fit and twice as thick as the factory cobra tensioner. Requires approximately 3-3.5mm shimming to line pulley up with belt otherwise a direct fit. Factory tension 25-30lbs. Roush tension 55-60lbs. This also works with metco 76mm dual bearing idler and with proper spacers it can be fitted with metco tensioner brace as well though would be overkill since this is twice as thick already.

        Helpful (3)
      • February 09, 2020

        5 2006 GT - TimothyB Installation Time: Less than 1 Hour


        Easy to install and way stronger than stock well worth the price. If you got it

        Helpful (3)
      • November 08, 2019

        5 2008 GT - Dpete710 Installation Time: Less than 1 Hour


        Easy install. Gets rid of the 'whining' noise after the bearings get worn out!

        Helpful (3)
      • October 25, 2019

        5 2007 GT - MARCS88 Installation Time: Less than 1 Hour

        Roush Belt Tensioner

        Heavy duty, great quality, the best replacement, easy install. Fast shipping.

        Helpful (3)
      • August 22, 2019

        1 2007 GT - Freddygt Installation Time: Less than 1 Hour


        Installed this on my whipple 07 mustang gt to help me from breaking belts...... well instead of breaking belts this snapped right in two leaving me stuck on the side of the road! I just bought this belt tensioner about two weeks ago!! Extremely unhappy with this product and even more disappointed in Roush for making something like this.

        Helpful (6)
      • August 06, 2019

        5 2003 Cobra - wild90 Installation Time: Less than 1 Hour

        Roush tensioner

        The Roush tensioner is a great upgrade to the factory tensioner. The Roush unit has a thicker arm and won't flex like the factory tensioner does when running higher boost levels. The Roush unit also has a stiffer spring, which helps eliminate belt slip.

        Helpful (3)
      • June 02, 2019

        5 2007 GT - ArtT Installation Time: Less than 1 Hour

        Good product

        Recieved on time, easy to install and good quality part.

        Helpful (3)
      • May 02, 2019

        5 2006 GT - John1 Installation Time: Less than 1 Hour

        heavy duty app.

        I had just put a new S.C. belt on and it added a lot. So I still was not getting enough boost till, I put the heavy duty belt tensioner on and now its running great with no slip.

        Helpful (3)
      • April 04, 2019

        3 2005 GT - Clearfieldbob

        Just recieved it.

        Just received the tensioner today and didn't install yet. It's beefier than the stock tensioner but I did notice it has a bearing made in China on the pulley? Thought Roush was all American? The reason I went with Roush was to get away from the stock tensioner with bad bearings. I'am going to install anyway. Hope it holds up to my Kenne Bell supercharger. What is Warranty on this tensioner. Sorry to be negative. Expected more for the money and name. Will do another review after the install.

        Helpful (4)

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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Heavy Duty Belt Tensioner
      • Installation Hardware

      Tech Specs

      Will It Fit My Mustang

      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09, 10

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