• Where can I purchase a Torsen differential?

    Most aftermarket models are available right here through our webstore. Additionally, some are also retailed by outside distributors, including Ford Racing, Maximum Motorsports, Griggs Racing, & Frankland Racing Supply.

  • Can I visit the JTEKT Torsen® facility in Rochester?

    Unfortunately, no. We are not open to the public and do not offer tours of our facilities.

  • Do you sell replacement parts for Torsen differentials?

    No. Most Torsen® models are considered non-serviceable and no parts are offered.

  • Do you make a Torsen for my application?

    Torsen® differentials are manufactured for both OEM and aftermarket models. See our OEM application chart for vehicles that come with Torsen® from the factory. Otherwise, please visit our e-commerce store for current aftermarket offerings.

  • Will you produce a differential for my application?

    We are always keeping an eye open for new potential aftermarket applications. However, we must have a sound business case before investing resources into designing and tooling a new model. If you have a suggestion for an application, contact us and we will investigate it.

  • Are Torsen® differentials for the Ford 8.8” axle compatible with independent rear suspension (IRS) applications?

    Yes, all aftermarket models for the 8.8 have the necessary grooves used by the snap-rings which retain the axle shafts in independent suspension systems. However, the OEM application Torsen® models used by Ford for the Ranger FX4 Level II, and then later the Mustang Boss 302 & Shelby GT500, do NOT have

  • Which style Torsen® is recommended for my application?

    Generally, this isn’t a choice that you have to worry about, as we only produce one per application. However, for some high performance applications, we offer the more aggressive T-2R model in addition to a standard Type-2. T-2R models have higher locking effect, with TBR in the range of 3:1 – 4:1, whereas the Type-2 models are typically in the 2:1 – 2.5:1 range. Which is better suited depends on how the vehicle will be used; autocrossers will normally prefer the T-2R, and daily drivers the Type-2, especially for winter use. People that are road racing or participating in open track events will have to decide based on the track they normally run at; larger tracks (open, fast and flowing) will probably favor the Type-2. Conversely, tracks that are short, tight and technical will probably require the T-2R.

  • Is it true that you sell a differential for the front axle of the late Ford Ranger?

    Yes! Our model 975420-0207B is specifically designed for the modified Dana 35 axle that Ford used in the US-market Ranger (1998-2011), Mazda B-series (1998-2007), as well as Explorer/Mountaineer models from 1995 through 2001 (through 2003 for Explorer Sport & Sport Trac). This model is a direct replacement for the OEM open differential.

  • What is TBR?

    Torque Bias Ratio (TBR) is the term used to quantify the performance (or spin resistance) of a differential. It represents the maximum amount of torque split between the two differential outputs. If TBR is 2:1, the differential will allow up to two times as much torque to be sent to the wheel with better traction than to the other wheel. Also, it will resist one-wheel spin until one tire has more than two times the traction compared to the other one. At that point, the differential will allow spin, but will continue to send more torque to the side with better traction.

  • Can I adjust the TBR of my Torsen?

    No, TBR is determined by the design and geometry of the gearing. Once it is established for a given application, it is fixed for that model. It may be possible to affect very minor changes with different lubricants (+/- 0.1:1), which is not likely enough to be able to feel while driving. Deviating from the oil recommended by the ring & pinion manufacturer also increases the risk of damaging said gears (see What Oil Should I Use?).

  • So, you would only recommend OEM fluid – not Royal Purple, Amsoil, or Mobil1?

    The OEM oil is what the axle system was tested – and proven - in by the manufacturer. Many other brands are well-regarded, with reputable products, but we have zero data as to what impact they'll have on performance or durability of the axle as a system. We would still recommend that you refer to you owner’s manual or the manufacturer of the ring & pinion gearing.

  • What is the warranty on a Torsen differential?

    OEM produced and installed differentials are covered by the vehicle manufacturer’s original warranty. Consult your owner’s manual or dealer for details. Aftermarket Torsen® differentials are warrantied against defects in material and workmanship for 1 year from the date of original purchase. Please have receipt or purchase documentation available if contacting us for a warranty claim.

  • Are Torsen differentials rebuildable?

    Generally speaking, no. The exception is for the Type-1 differential sold for Frankland Racing Supply quick-change axles. These can be returned for inspection, repair or rebuilding as required. Please contact Frankland (888-8-REAR-END) for more information or to arrange service work.

  • I have a problem with the OEM Torsen in my vehicle.

    Your factory-installed Torsen® differential is covered under your car’s original warranty. Please see you your dealer for service.

  • Can I buy the factory, OEM Torsen for my vehicle?

    Due to contractual agreements with our OEM customers, we cannot sell those products to anyone but the vehicle manufacturer. Please visit your dealer for more information, as it would have to acquired as a service part.

  • Will you custom modify or produce a one-off differential for me?

    Unfortunately, no, we cannot accommodate custom requests.

  • Do you still sell or have parts for the Torsen differential for the Mazda Miata?

    Unfortunately, no, we do not. Torsen® differentials for NA & NB Miata applications were last produced circa 2002, and any complete differentials, components or the tools to produce them are long gone.

  • Are 4.10:1 or higher gears compatible with Torsen?

    Several aftermarket models have a removable center block to allow installation of C-clip axle retainers. Removal of this block may be hindered by high-numeric ratio ring gears, if the new ring gear is thicker than the OEM gear. Do NOT grind or remove material from the center block – doing so will upset the internal clearances of the Torsen®. In some cases, the block can be accommodated by removing a small amount of material from the tips of the gear teeth that interfere with block removal. For certain applications, we offer a 2-piece center block to facilitate gear swaps.

  • How do Torsen® differentials work?

    It’s actually quite simple – by creating friction. Friction within the gearing is what resists wheel slip. When torque is applied to the differential, it generates thrust forces on the gears. The gears, in turn, push against the inside walls of the differential case, and that produces friction. In short, the more torque is applied, the more friction is generated, and the more resistance to wheel spin there is. See How it Works on this website.

  • What is the TBR for my application?

    In general, the TBR level of Type-2 products is between 2:1 and 2.5:1, whereas T-2R models are in the 3:1 to 4:1 range. This varies depending on the specific model. The TBR level of Type-1 differentials can be anywhere from 2.8:1 to 4:1, depending on the design requirements.

  • Do I need to use friction modifier with Torsen?

    Yes and no. Although the differential does not use a clutch pack design, modifier additive is still sometimes used in OEM applications. In such cases, we suggest referring to the OEM recommendation.

  • What oil should I use with Torsen?

    Torsen® Type-1 differentials require lubricant with a GL-5 rating. Type-2 and T-2R models can operate in a wide range of fluids but share lube with other components that may have specific needs. Consult your vehicle’s owner’s manual or with the manufacturer of the ring & pinion set (if not OEM) for their recommendation.

Additional Questions

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