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TREMEC

Transmission, Tremec T-56 Magnum 6-Speed 26-Spline, 2.66 1st, 0.63 6th

Part# : CH35243
Mfg#: TUET 11009
Sold As: Each
Ship Size: Oversize 3
$3,699.99
List Price: $4,070.95
You Save $370.96

Ships direct from manufacturer
Allow 2-6 weeks for item to arrive.
Fits 1958–1986 Bonneville View fitment for 59 models
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The Aftermarket's Premier Transmission Magnum 6-speed manual transmission

The kingpin of TREMEC's high performance line-up, the 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 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 muscle cars. Multiple shifter locations, giving you refinement where you want it and strength where it counts. Can be combined with any GM engine; big block, small block, or LS when using the correct bell housing.

Clutch Fork Included: No Clutch Type: Hyd Input Shaft Diameter: 1.125" Input Shaft Spline Quantity: 26 Output Shaft Spline Quantity: 31 Pivot Ball Included: No Shifter Included : Yes Torque Capacity: 700 Yoke Included: No Yoke Style: Slip On Speedo Output: Mech/Elec 1st Gear Ratio: 2.66 2nd Gear Ratio: 1.78 3rd Gear Ratio: 1.30 4th Gear Ratio: 1.00 5th Gear Ratio: 0.80 6th Gear Ratio: 0.63 Reverse Gear Ratio: 2.90

Notes

  • Some applications will require tunnel modifications, torque arm relocation, or a new driveshaft.
  • This item is not eligible for any further discounts or promotional pricing.
  • SHIP NOTE: Item exceeds standard ground freight size/weight, and is not eligible for free ground shipping.
  • SHIP NOTE: This item is SPECIAL ORDER and will drop-ship from the manufacturer. While the majority of drop ship orders experience no delays, please be advised that OPGI does not control delivery times.

Find Item In These Catalogs

  • 2025 Cadillac 1936-1993 91
  • 2025 Chevelle, El Camino 64-77 270
  • 2025 Cutlass, F-85 & 442 61-77 173
  • 2025 GM G-Body 1978-1988 119
  • 2025 GTO, LeMans & Tempest 188
  • 2025 Monte Carlo 70-77 133
  • 2025 Riviera 1963-76 70
  • 2025 Skylark, GS & GSX 61-72 151
WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Vehicle Fitment

Year Make Model Application Details
1982 Buick Grand National close ratio, 0.63 6th
1984–1987 Buick Grand National close ratio, 0.63 6th
1976–1987 Buick Regal close ratio, 0.63 6th
1978–1987: close ratio, 0.63 6th
1963–1976 Buick Riviera close ratio, 0.63 6th
1961–1972 Buick Skylark close ratio, 0.63 6th
1983–1987 Buick T-Type close ratio, 0.63 6th
1938–1993 Cadillac 60 Special close ratio, 0.63 6th
2013–2019 Cadillac ATS close ratio, 0.63 6th
1965–1976 Cadillac Calais close ratio, 0.63 6th
2003–2019 Cadillac CTS close ratio, 0.63 6th
1959–2005 Cadillac DeVille close ratio, 0.63 6th
1953–2002 Cadillac Eldorado close ratio, 0.63 6th
1999–2000 Cadillac Escalade close ratio, 0.63 6th
2002–2023 Cadillac Escalade close ratio, 0.63 6th
2002–2013 Cadillac Escalade EXT close ratio, 0.63 6th
1965–1996 Cadillac Fleetwood close ratio, 0.63 6th
1936–1951 Cadillac Series 60 close ratio, 0.63 6th
1946–1964 Cadillac Series 60 Fleetwood  
1936–1951 Cadillac Series 61 close ratio, 0.63 6th
1937–1976 Cadillac Series 62 close ratio, 0.63 6th
1936–1951 Cadillac Series 63 close ratio, 0.63 6th
1937–1938 Cadillac Series 65 close ratio, 0.63 6th
1936–1942 Cadillac Series 67 close ratio, 0.63 6th
1936–1937 Cadillac Series 70 close ratio, 0.63 6th
1940 Cadillac Series 72 close ratio, 0.63 6th
1936–1942 Cadillac Series 75 close ratio, 0.63 6th
1946–1964 Cadillac Series 75 close ratio, 0.63 6th
1946–1964 Cadillac Series 75 Fleetwood  
1976–2004 Cadillac Seville close ratio, 0.63 6th
2005–2011 Cadillac STS close ratio, 0.63 6th
2004–2009 Cadillac XLR close ratio, 0.63 6th
1947–1955 Chevrolet Advance Design  
1960–1987 Chevrolet C10 close ratio, 0.63 6th
1960–1987 Chevrolet C20 close ratio, 0.63 6th
1960–1987 Chevrolet C30 close ratio, 0.63 6th
1964–1977 Chevrolet Chevelle close ratio, 0.63 6th
1960–1969 Chevrolet Corvair close ratio, 0.63 6th
1961–1965 Chevrolet Corvair 95 FC close ratio, 0.63 6th
1959–1960 Chevrolet El Camino close ratio, 0.63 6th
1964–1987 Chevrolet El Camino close ratio, 0.63 6th
1978–1987: close ratio, 0.63 6th
1960–1987 Chevrolet K10 close ratio, 0.63 6th
1960–1987 Chevrolet K20 close ratio, 0.63 6th
1977–1987 Chevrolet K30 close ratio, 0.63 6th
1978–1983 Chevrolet Malibu close ratio, 0.63 6th
1997–2022 Chevrolet Malibu  
1970–1988 Chevrolet Monte Carlo 1970–1977: close ratio, 0.63 6th
close ratio, 0.63 6th
1978–1988: close ratio, 0.63 6th
1995–2007 Chevrolet Monte Carlo close ratio, 0.63 6th
1960–1991 Chevrolet Suburban close ratio, 0.63 6th
1955–1959 Chevrolet Task Force close ratio, 0.63 6th
1955–1959 GMC Blue Chip close ratio, 0.63 6th
1960–1987 GMC C15/C1500 close ratio, 0.63 6th
1960–1987 GMC C25/C2500 close ratio, 0.63 6th
1960–1987 GMC C35/C3500 close ratio, 0.63 6th
1970–1991 GMC Jimmy close ratio, 0.63 6th
1960–1987 GMC K15/K1500 close ratio, 0.63 6th
1960–1987 GMC K25/K2500 close ratio, 0.63 6th
1977–1987 GMC K35/K3500 close ratio, 0.63 6th
1947–1955 GMC New Design close ratio, 0.63 6th
1961–1988 Oldsmobile Cutlass 1961–1977: close ratio, 0.63 6th
close ratio, 0.63 6th
1978–1988: close ratio, 0.63 6th
1958–1986 Pontiac Bonneville close ratio, 0.63 6th
1959–1977: close ratio, 0.63 6th
1978–1986: close ratio, 0.63 6th
1959–1977 Pontiac Catalina close ratio, 0.63 6th
1962–1987 Pontiac Grand Prix 1962–1977: close ratio, 0.63 6th
close ratio, 0.63 6th
1978–1987: close ratio, 0.63 6th
1964–1973 Pontiac GTO close ratio, 0.63 6th
1961–1981 Pontiac LeMans 1961–1973: close ratio, 0.63 6th
close ratio, 0.63 6th
1961–1970 Pontiac Tempest close ratio, 0.63 6th
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Transmission, Tremec T-56 Magnum 6-Speed 26-Spline, 2.66 1st, 0.63 6th
TREMEC Transmission, Tremec T-56 Magnum 6-Speed 26-Spline, 2.66 1st, 0.63 6th