TREMEC T56 Magnum 6-Speed Conversion Package | 1968-1972 BOP A-Body

TREMEC T56 Magnum 6-Speed Conversion Package | 1968-1972 BOP A-Body

TREMEC T56 Magnum 6-Speed Conversion Package | 1968-1972 BOP A-Body

Description

Key Features

  • 700 lb-ft torque capacity -- handles serious big block power without compromise
  • Double overdrive gearing with 0.80 fifth and 0.63 sixth ratios -- drops highway RPM dramatically for improved fuel economy and reduced engine wear
  • 26-spline input shaft with widened gears and one-piece countershaft for extreme durability
  • Triple-cone synchronizers on gears 1-4; double-cone synchronizers on 5th, 6th, and reverse for crisp, positive shifts
  • 135 lbs dry weight -- significantly lighter than most automatics with similar torque capacity
  • Multiple gear ratio options: 2.66 close ratio or 2.97 wide ratio first gear configurations
  • Dual speedometer pickups support both mechanical and electronic speedometer connections
  • Complete guided package selection -- every component matched to your specific engine and vehicle
  • Tunnel modifications required -- sheet metal tunnel extension available for proper fitment

Description

Transform your '68-'72 Pontiac GTO, Oldsmobile 442/Cutlass, or Buick Skylark/GS from a tired four-speed or slipping automatic into a modern overdrive powerhouse. This custom TREMEC T56 Magnum conversion package delivers the ultimate combination of strength and refinement -- capable of withstanding 700 lb-ft of torque while providing unbelievably crisp shifts that modern factory muscle cars are known for. The Magnum represents the pinnacle of manual transmission technology, incorporating the same durable componentry found in today's hardest-hitting OEM performance vehicles.

The engineering behind the Magnum solves the fundamental weaknesses that plagued earlier transmissions. Forged gears with laser-beam welded engagement teeth enable precise tooth shaping with better pitch and angle control, plus positive stops to prevent over-travel on hard shifts. Spring-loaded ball-type shift detent inserts replace the failure-prone stamped keys of earlier designs, reducing friction and eliminating notchy shifting for remarkably short, smooth gear changes. The one-piece countershaft with thicker journals and widened gear faces eliminates the torque limitations of earlier two-piece designs, while larger bearings in all critical support areas provide extraordinary stability under extreme loads.

BOP A-body applications require tunnel modification to maintain correct driveline angles with the T56 Magnum's case dimensions. MDL provides a sheet metal tunnel extension that attaches to your OEM floor pan, allowing proper transmission placement while preserving your interior. Our guided package selection process walks you through every component choice -- from BOP-specific bellhousing and flywheel selection to clutch specifications and hydraulic release systems. Whether you're running a Pontiac 400/455, Olds 350/455, or Buick 350/455, each package is engineered specifically for your engine combination and performance goals.

All custom TREMEC Magnum packages include MDL's concierge service -- our technical team helps you select the right components for your project and budget. With dual speedometer pickups supporting both mechanical and electronic speedometers and approximately 3.66-quart fluid capacity using Dexron III ATF or GM Synchromesh, the Magnum integrates seamlessly into classic applications while delivering modern performance and reliability. Contact MDL to build your complete conversion package.

What's Included

  • TREMEC T56 Magnum 6-speed transmission (2.66 close ratio or 2.97 wide ratio options available)
  • BOP-pattern bellhousing for Pontiac, Oldsmobile, or Buick engines
  • Transmission-to-bellhousing hardware kit
  • Steel flywheel matched to your engine application and balance
  • Flywheel bolts (standard or ARP upgrade)
  • Performance clutch kit with pressure plate (multiple torque ratings available)
  • Pressure plate bolts (standard or ARP upgrade)
  • Hydraulic clutch pedal assembly (when selected)
  • Pedal pad kit in black or machined finish (when selected)
  • Hydraulic master cylinder kit in polished, black, or chrome finish (when selected)
  • Hydraulic release bearing assembly (when selected)
  • Braided stainless hydraulic line and fittings (when selected)
  • Shift knob in multiple styles and colors (when selected)
  • Shift lever assembly (when selected)
  • Shift boot (when selected)
  • Speedometer cable adapter or electronic sensor (when selected)
  • Speedometer gear and retaining clip (when selected)
  • Reverse light wiring harness (when selected)
  • Reverse lockout controller and harness (when selected)
  • Transmission mount (when selected)
  • TREMEC-approved transmission fluid -- 4 quarts (when selected)
  • Sheet metal tunnel extension (when selected)
  • Complete installation instructions
  • MDL lifetime technical support
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