TREMEC T56 Magnum 6-Speed Conversion Package | Buick, Oldsmobile, Pontiac

TREMEC T56 Magnum 6-Speed Conversion Package | Buick, Oldsmobile, Pontiac

TREMEC T56 Magnum 6-Speed Conversion Package | Buick, Oldsmobile, Pontiac

Description

Key Features

  • 700 lb-ft torque capacity handles serious power from built BOP V8s
  • Double overdrive ratios (0.74/0.50) drop highway RPMs for improved fuel economy and reduced engine stress
  • 26-spline input shaft, 31-spline output shaft
  • Triple-cone synchronizers on 1st-4th gears, double-cone on 5th, 6th, and reverse for smooth, low-effort shifts
  • 140 lbs dry weight with 3.66-quart fluid capacity using Dexron III ATF
  • Dual speedometer pickups support both mechanical and electronic gauges
  • BOP-specific bellhousing with distinctive twin-peak bolt pattern for Buick, Oldsmobile, and Pontiac V8s
  • Multiple gear ratio options available to match your driving style and rear gear combination

Description

Classic Buick, Oldsmobile, and Pontiac muscle deserves a modern drivetrain. This complete TREMEC T56 Magnum 6-speed conversion package delivers everything needed to swap out your tired automatic or worn 4-speed for a transmission that handles over 700 lb-ft of torque while providing double overdrive capability. Whether you're running a built 455, a stroker 400, or a freshened numbers-matching mill, the Magnum brings your BOP-powered machine into the modern era with improved highway cruising, better fuel mileage, and the engagement only a manual gearbox delivers.

The T56 Magnum is built on TREMEC's proven TR-6060 architecture with significantly widened gear face widths and laser-beam welded engagement teeth for precise pitch and angle control. The one-piece countershaft eliminates the torque limitations of earlier two-piece designs, while spring-loaded ball-type shift detents replace stamped keys to deliver incredibly short, smooth shifts even under hard acceleration. Triple-cone synchronizers on gears 1-4 and double-cone synchros on 5th, 6th, and reverse ensure effortless gear changes at any RPM.

The BOP bellhousing bolt pattern was standardized across Buick, Oldsmobile, and Pontiac divisions in 1964, featuring a distinctive twin-peak design that differs from Chevrolet's single-peak pattern. This package includes a BOP-specific bellhousing designed to mate your engine to the Magnum, along with your choice of flywheels configured for various BOP engine displacements and balance requirements. Hydraulic clutch actuation with an internal release bearing provides modern pedal feel and eliminates mechanical linkage maintenance.

MDL's guided package selection walks you through every component choice-transmission ratio, clutch setup, hydraulic system, shifter style, speedometer solution, and driveline hardware. Some tunnel modifications may be required depending on your specific vehicle, but shifter position is retained for a stock look and feel. If you have questions at any point, MDL offers concierge service to help you select the right parts for your project and budget.

What's Included

  • TREMEC T56 Magnum 6-speed transmission (multiple gear ratio options available)
  • BOP-pattern bellhousing for Buick, Oldsmobile, and Pontiac V8 engines
  • Transmission-to-bellhousing hardware kit
  • Clutch assembly selection (pressure plate, disc, and release bearing options)
  • BOP-specific flywheel options for various engine displacements and balance configurations
  • Pressure plate bolt set (standard or ARP options)
  • Hydraulic master cylinder kit with bore size options
  • Internal hydraulic release bearing
  • Hydraulic line
  • Transmission mount
  • Shift lever selection (MDL custom or Hurst options)
  • Speedometer cable adapter or electronic sensor
  • Speedometer driven gear and clip
  • Four quarts Dexron III ATF transmission fluid
  • Speedometer wiring harness
  • Reverse light wiring harness
  • Drive shaft yoke (multiple U-joint series options)
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