6-Speed M/T | Super Magnum T56 | 2.66:1 Kit

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  • 6-Speed M/T | Super Magnum T56 | 2.66:1 Kit
  • 6-Speed M/T | Super Magnum T56 | 2.66:1 Kit
MSRP: $5,999.99
— You save $1,000.00


American Powertrain Tremec T-56 Magnum manual transmissions and installation kits are designed to withstand up to 700 ft.-lbs. of torque. Their gears feature substantially increased face widths and 2-piece laser-beam welded construction, allowing for greater control of the tooth angles, pitch, and alignment. The transmissions also feature a bolstered one-piece countershaft to resist distortion, and a stronger input shaft. Their new synchronizers feature fine tooth angles, redesigned shift forks, and an extensively modified transmission case to prevent leaks under high-stress conditions and increase overall power-handling capabilities.

Kits include:

* Cryo-hardened steel driveshaft slip yoke with 1330 style U-joint
* Mechanical speedometer conversion
* VSS wiring harness for electronic speedometer of EFI ECU
* Rolled tapered steel transmission tunnel patch
* Reverse light wiring, weather seal harness, non-polar
* Reverse lockout wiring harness
* ISO-X ballistic, low-profile transmission mount
* Steel roller pilot bearing
* White shift knob with black 6-speed shift pattern

  • Number of Gears:Six
  • Input Shaft Diameter:1.125 in.
  • Input Spline Quantity:26
  • Output Shaft Spline Quantity:31
  • Bellhousing Included:No
  • Yoke Included:Yes
  • Shifter Included:Yes
  • First Gear Ratio:2.66:1
  • Second Gear Ratio:1.78:1
  • Third Gear Ratio:1.30:1
  • Fourth Gear Ratio:1.00:1
  • Fifth Gear Ratio:0.80:1
  • Sixth Gear Ratio:0.63:1
  • Case Material:Aluminum
  • Crossmember Included:Yes
  • Crossmember Material:Aluminum
  • Crossmember Finish:Natural
  • Transmission Mount Included:Yes
  • Transmission Mount Type:Polymer
  • Transmission Tunnel Patch Included:No
  • Pilot Bushing Included:Yes
  • Pilot Bushing Material:Steel
  • Pilot Bushing Type:Roller
  • Speedometer Cable and Gear Included:No
  • Backup Light Connector Harness Included:Yes
  • Mounting Hardware Included:Yes
  • Fabrication Required:No
  • Quantity:Sold as a kit.
  • Notes:X-Factor aluminum modular crossmember, 1000 HP certified, offers clearance for 3.5 in. diameter exhaust systems. Designed for electronic or mechanical speedometers (7-tooth). 700 ft.-lbs. torque capacity. Requires bellhousing adapter or engine specific bellhousing. Shifter stick not included.
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