Bert LMZ Aluminum Transmission

The Bert LMZ Aluminum Transmission is a lightweight, race-proven 2-speed manual transmission engineered specifically for IMCA Modified, Stock Car, and Late Model racing. Designed with an internal hydraulic clutch assembly, the LMZ significantly reduces rotating weight while providing fast, reliable shifts and exceptional durability under demanding racing conditions. Featuring dog-tooth gears for positive gear engagement and a compact aluminum case, the Bert LMZ has become one of the most trusted transmissions in circle track competition. It is IMCA-approved and is widely used by racers seeking maximum performance and reliability.

The LMZ transmission delivers two forward speeds plus reverse, with direct drive in high gear (1.00:1) for maximum power transfer. Its compact design is approximately 2-5/8 inches shorter than a Muncie transmission, allowing easier installation and improved weight distribution. The transmission accepts standard GM Muncie, Saginaw, and Powerglide slip yokes, making it compatible with many existing driveline setups.

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Features

• Genuine Bert LMZ Aluminum Racing Transmission
• Lightweight aluminum case construction
• Internal hydraulic clutch assembly
• Two forward speeds with reverse
• Direct-drive high gear (1.00:1)
• Heavy-duty dog-tooth gears for fast, positive shifts
• Reduced rotating weight for improved acceleration
• Approximately 2-5/8 inches shorter than a Muncie transmission
• Compatible with standard two-lever shifters
• Accepts GM Muncie, Saginaw, and Powerglide slip yokes
• Designed for circle track racing
• IMCA-approved for Modified, Stock Car, and Late Model classes

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Gear Ratios

• Low Gear: Racing low gear
• High Gear: 1.00:1 Direct Drive
• Reverse: Yes

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Specifications

• Brand: Bert Transmission
• Manufacturer Part Number: LMZ
• Transmission Type: 2-Speed Manual
• Application: Circle Track Racing
• Torque Capacity: 600 lb-ft
• Case Material: Aluminum
• Input Shaft Diameter: 1.0625 Inches (1-1/16″)
• Input Shaft Spline Count: 10
• Output Shaft Diameter: 1.1875 Inches (1-3/16″)
• Output Shaft Spline Count: 27
• Overall Length: Approximately 19 Inches
• Dry Weight: Approximately 48 lbs
• Clutch Type: Internal Hydraulic Clutch
• Shifter Type: Two-Lever (Not Included)
• Bellhousing Included: No
• Slip Yoke Included: No

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Package Includes

• Bert LMZ Aluminum Transmission
• Internal Hydraulic Clutch Assembly
• Front Bearing Retainer
• Internal Dog-Tooth Gear Set
• Installation Documentation

Bellhousing, shifter, transmission mount, slip yoke, driveshaft, and transmission lubricant are sold separately unless otherwise specified.

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Recommended Applications

Ideal for:

• IMCA Modified Race Cars
• IMCA Stock Cars
• IMCA Late Models
• Circle Track Racing
• Dirt Track Racing
• Asphalt Racing
• Hobby Stock Builds
• Custom Race Chassis

Compatible with racing applications using the appropriate bellhousing, driveline components, and standard GM-style slip yokes.

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Installation Requirements

Installation may require:

• Bert-compatible two-lever shifter
• Racing bellhousing
• 10-spline clutch disc
• 27-spline slip yoke
• Transmission mount
• Driveshaft modification depending on chassis
• Bert Blue Magic transmission lubricant or manufacturer-recommended racing lubricant

Professional installation is recommended to ensure proper clutch operation, driveline alignment, and maximum race performance.

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Warranty

The Bert LMZ Aluminum Transmission is backed by a 1-Year Limited Warranty, covering defects in materials and workmanship under normal racing use and proper installation.

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Why Choose the Bert LMZ Aluminum Transmission?

The Bert LMZ Aluminum Transmission is one of the most respected transmissions in circle track racing, offering a winning combination of lightweight construction, race-proven durability, and dependable performance. With its 600 lb-ft torque capacity, internal hydraulic clutch, dog-tooth gear engagement, 48-pound aluminum case, and IMCA-approved design, the LMZ provides quicker acceleration, smoother shifting, and reduced rotating mass to help maximize performance on the track. Whether you’re building a Modified, Stock Car, or Late Model race car, the Bert LMZ delivers the strength and reliability serious racers demand.