MDL TREMEC GM TKX 5-Speed | 2.87 First, 0.68 OD | 2” Left Side Shift Front, Straight Up Offset

Key Features

• 600 lb-ft torque capacity with 7,500 RPM shift capability and 8,000 RPM engine speed rating
• Close-ratio gearing (2.87, 1.89, 1.28, 1.00, 0.68) balances strong launches with relaxed highway cruising
• 26-spline input shaft (1-1/8 in. diameter) and 31-spline output shaft for added strength
• Compact end-loaded aluminum case fits most GM tunnels without floor modifications
• Ribbed 3-piece housing (main case, intermediate plate, rear extension) for structural stiffness
• Multi-cone synchronizers with sintered carbon/bronze hybrid rings for smooth high-RPM shifts
• ASTM 4615 special-grade steel gears and shafts with caged needle bearings in all gear positions
• GM Muncie bellhousing bolt pattern - direct swap for 3-speed and 4-speed applications
• GM 0.590-inch pilot tip with 1.375-inch OD throwout bearing guide tube
• Built-in reverse light switch and cruise control safety switch
• Dual speedometer outputs: mechanical 7-tooth Ford gear (adaptable to GM) plus OSS two-wire analog sensor
• 99 lbs dry weight; 2.7-quart fluid capacity
• High-performance short-throw billet aluminum shifter included
• MDL side shift modification with a straight up stub - precise shifter placement without compromise
• Shifter Stub Location: 2” left of center line, 16.75” back from the bellhousing face
• MDL Exclusive - not available through TREMEC

Description

Classic GM A-body builders face a common dilemma: the factory TKX shifter location doesn't land where the original four-speed did. This MDL-modified TREMEC TKX solves that problem by permanently integrating a custom close-ratio shifter assembly directly into the transmission case, repositioning the shifter stub to the front socket location. The result is a five-speed that shifts where your hand expects it - no awkward reach, no console interference, no compromise.

This isn't a bolt-on adapter or aftermarket shifter slapped onto a stock unit. MDL's technicians carefully machine the case, update internal components, and integrate new pieces to create a transmission that functions as an engineered whole. The close-ratio gear spread (2.87 first through 0.68 overdrive) keeps the engine in its powerband through the gears, while the deep overdrive drops highway RPMs for comfortable cruising. The TKX's end-loading design and streamlined three-piece aluminum housing provide the tunnel clearance that makes installation possible in tight GM A-bodies without cutting your floor.

Inside, hybrid carbon/bronze triple-cone synchronizers with non-leading tooth profiles deliver smooth, precise shifts at engine speeds up to 7,500 RPM. The internal 3-rail shift system with steel shift forks handles aggressive driving session after session. Tapered roller bearings on the input, output, and countershafts minimize noise while caged needle bearings support the mainshaft for long-term durability. All gears and shafts are manufactured from ASTM 4615 special-grade steel for maximum torque-carrying capacity.

Built for BOP (Buick-Olds-Pontiac) applications using the GM Muncie 3/4-speed bellhousing bolt pattern, this transmission includes a built-in reverse light switch on the left side and a cruise control safety switch location on the right. OSS two-wire analog speedometer sensor is built in, plus a Ford-style 7-tooth mechanical speedometer drive that can be adapted to GM. Fluid capacity is 2.7 quarts - use Dexron III ATF, TREMEC HP-MTF, GM Synchromesh, or Mobil 1 Synthetic ATF. Every modified TKX is hand-prepared at MDL's facility and verified before shipping. Requires separate purchase of offset stub for final shifter positioning.

Kit Includes

• TREMEC TKX 5-speed transmission (TCET17805) with 2.87/1.89/1.28/1.00/0.68 gear ratios
• High-performance short-throw billet aluminum shifter (2” left side shift front, straight up stub)
• Gaskets for all mating surfaces
• Built-in reverse light switch (left side)
• Built-in cruise control safety switch (right side)
• Mechanical speedometer drive gear (7-tooth Ford pattern, adaptable to GM)
• OSS two-wire analog speedometer sensor
• MDL extended warranty: manufacturer warranty plus 1 additional year with 1-year grace period
• Lifetime technical support

Specifications

• Torque Rating: 600 lb-ft
• Engine Speed Capability: 8,000 RPM (shifts at 7,500 RPM)
• Input Shaft: 26-spline
• Output Shaft: 31-spline
• Gear Ratios: 2.87, 1.89, 1.28, 1.00, 0.68
• Bellhousing Pattern: GM Muncie 3/4-speed
• Pilot Tip: .590" diameter
• Throwout Bearing Guide Tube: 1.375" OD
• Shifter Position: Front socket, side shift, 16.75" from bellhousing face
• Offset Range: 1.75-2.25" (with optional offset stub)
• Fluid Capacity: 2.7 quarts / 2.6 liters
• Recommended Fluid: Dexron III ATF, TREMEC HP-MTF, GM Synchromesh, or Mobil 1 Synthetic ATF
• Dry Weight: 99 lbs
• Speedometer: Mechanical 7-tooth drive + electronic OSS sensor
• Reluctor Wheel: 17-tooth