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Tech Alley               "Where you find all the answers."

The solution to 2005-up Ford Mustang S197 Shift problems

Are you plagued with shifting issues in your 2005-up Mustang, including the 2011 and 2012 Mustang’s? Have you beefed up the motor with power adders, pushing beyond the limits of the TR3650 (2005-2010) or Getrag MT-82 (2011-2012)? Is the 2-piece driveshaft causing vibration issues at high speeds?


TREMEC S197 T-56 Magnum XL

The TREMEC® T56 Magnum XL 6-speed transmission is aimed specifically at S197 Mustang enthusiasts! The new ‘direct-shift” T56 Magnum™ XL for 2005-up Ford Mustangs represents a long awaited solution to the semi-remote shifter woes experienced by many 2005-up Mustang owners, as well as, TREMEC’s most significant foray into the Mustang aftermarket since the days of emerging 5.0 Fox-body performance!

Shift issues solved

Designed almost exclusively with S197 Mustangs in mind, this new model draws from a combination of proven OE (Shelby GT500) and racing (Grand Am Cup) technologies. Featuring an application specific ‘direct-shift’ extension housing, the Magnum solves the issue of numb, inaccurate shifts offered by the factory semi-remote shifter; replacing them instead with crisp, clean, confidence-inspiring throws. The S197’s exceptional driver ergonomics are maintained; along with the added ability to custom tailor shift action thanks to TREMEC’s innovative “adjustable-bias” short throw shifter, standard on every new assembly!

T-56 Magnum XL

TREMEC S197 T-56 Magnum XL

High Performance kit

Other significant features include a slip yoke rear interface, eliminating the need for complex 2-piece driveshafts, and an SFI-approved steel bellhousing for added safety in high-horsepower applications!  Installation is simple thanks to thoughtful design by TREMEC engineers and a TREMEC supplied swap-specific crossmember. In most cases users can even retain their factory clutch release system. Like all Magnum series transmissions, the new model carries with it a generous 700 lb-ft torque capacity rating, and the choice of two exclusive gear ratio combinations.

Wide ratio & short ratio gear choices

Part Number
Kit / Trans
Application Torque Cap.
Gear Ratio Chart
1st 2nd 3rd 4th 5th 6th Rev
TUKT12019 /
S197 700 2.66 1.78 1.30 1.00 0.74 0.50 2.90
TUKT12021 /
S197 700 2.97 2.10 1.46 1.00 0.80 0.63 2.90

For comparison purposes, the following chart shows the 2005-2010 TR3650 ratios and the 2011-2012 Getrag transmission ratios.

Trans Application Torque Cap.
Gear Ratio Chart
1st 2nd 3rd 4th 5th 6th Rev
TR3650 S197 450 3.38 2.00 1.32 1.00 0.68   3.38
Getrag MT-82 S197-V8 383 3.66 2.43 1.69 1.32 1.00 0.65 ?
Getrag MT-82 S197-V6 370 4.24 2.54 1.66 1.24 1.00 0.70 ?

Remember, when changing from one transmission to the other that the rear-end ratio is going to make a difference. Stock ratio's range from 2.73, 3.31, 3.55, 3.73 depending on V6 or V8 and stock vs performance package etc.

How does the T56 Magnum compare to previous T-56's?

The kingpin of TREMEC’s high performance line-up, the all-new T-56 Magnum takes the very best from current OEM technologies and pairs it with the most popular features of the all-business TKO 5-speed.  Just what is it that makes the TREMEC T-56 Magnum better than its predecessors? 

Convinced that you need one?

Give us a call today.  Our kit will include all that you need for a successful conversion to the S197 Magnum XL 6-speed.

  • S197 Magnum XL Transmission
  • Quicktime SFI bellhousing
  • Crossmember
  • 1-piece Driveshaft
  • Shift lever and ball
  • Electrical Harness
  • Speedometer calibration box (2011+)

Also available are upgraded clutch choices and upgraded hydraulic throwout bearing.

You can also send us your details and we'll get back to you with a quote.