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Tremec 6-Speed Magnum T56 Close Ratio GM Transmission (Trans Only) BPI-TRANS-TUET-11009

Tremec 6-Speed Magnum T56 GM Transmission (Trans Only), Manual, 26-spline input shaft, 4616 chromoly gears and shafts, one-piece counter shaft, triple cone synchros, new in box, full factory warranty, ratios: 2.66, 1.78, 1.30, 1:1, .80, .63. These will not Work on a 1998-2002 F-Body's or 2004-2006 GTO's
Availability: Now ships in 2-3 business days
Pricing: $3,745.00
5 5 1



The kingpin of TREMEC's high performance line-up, the T-56 Magnum double-overdrive 6-speed transmission takes the very best from TREMEC's current OEM technologies and pairs it with the most popular features of the TKO 5-speed.

Able to withstand a massive 700 lb-ft. of torque while providing unbelievably crisp shifts, no other manual transmission on the planet offers as much combined strength, versatility, and general ease-of-use as the T-56 Magnum.

Known in its original equipment form as the 'TR-6060', the Magnum is an aftermarket version of the same transmission found in many of today's most celebrated factory super cars – including the ZR1 Corvette and ACR Viper – giving you refinement where you want it and strength where it counts.

  • The aftermarket's premier 6-speed performance manual transmission
  • 700 lb-ft. of torque capacity
  • Reasonably light at 135 lbs. dry
  • Multiple shifter locations & dual speedo pickups for unmatched versatility
  • Choice of two different gear ratio sets (2.66 or 2.97), with unique double overdrive ratios
  • Incredibly short, extremely low-effort shift throws, with crisp, precise engagement
  • Modern OE supercar technology for the ultimate pro-tourers, road-racers, and more.
Application Part # Engine Torque Capacity
Clutch Type Speedo Type Spline Count
Input / Output
Gear Ratios
2nd 3rd 4th 5th 6th Rev
GM TUET11012 LS 700 No Hyd Mech/Elec 26 / 31 2.66 1.78 1.30 1.00 .80 .63 2.90



  • BPI-TRANS-TUET-11009
  • BPI-TRANS-TUET-11009
  • Butler Performance
  • Now ships in 2-3 business days
  • New


Customer Reviews

Comment Total Reviews (1)

72 Firebird upgrade to Tremec 6 speed
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 1 year

Purchased from: Butler Performance Inc.

Upgraded my 72 Firebird Muncie 4 speed to the T-56 6 speed Tremec. Called the Butler team and they sent me a complete install kit with the Tremec transmission. The swap went extremely well with all there parts. Kit included everything like the bell housing, hydraulic clutch, crossmember, speedo cable, ect...,. I was concerned that the Tremec 6 speed was too big for the trans tunnel but not so ! I did have to trim for the shifter hole a small amount and have my drive shaft shortened. After a little help from the guys I found out that the Tremec " close " ratio is a match to the Muncie " wide " ratio. I'm running a 3:90 rear gear and the new overdrives are like having air conditioning for the first time ! Caint believe I waited so long !

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