Bert LMZ Transmission Kit for 2 Piece Rear Main Seal

The Bert LMZ Transmission Kit for 2-Piece Rear Main Seal is a complete 2-speed racing transmission package engineered for 1955–1985 Chevrolet Small Block V8 engines with a 2-piece rear main seal. Built for IMCA Stock Cars, Modifieds, Dirt Late Models, Hobby Stocks, and other circle track racing classes, this lightweight transmission kit is designed to maximize horsepower transfer, improve throttle response, and deliver dependable race-winning performance.

The Bert LMZ features an internal clutch assembly that significantly reduces rotating weight while the upgraded dog-tooth gears provide faster, smoother shifting. Its direct-drive high gear, 600 lb-ft torque capacity, and compact design—approximately 2-5/8 inches shorter than a Muncie transmission—make it an excellent choice for high-performance racing applications.

Features

• Genuine Bert LMZ 2-Speed Racing Transmission Kit
• Designed for 1955–1985 Chevy Small Block V8 (2-Piece Rear Main Seal)
• Internal clutch assembly reduces rotating weight
• New dog-tooth gears for faster, easier shifting
• Two-speed transmission with reverse
• Direct-drive high gear
• IMCA Approved for Stock Car, Modified, and Late Model classes
• Lightweight aluminum transmission case
• Approximately 2-5/8 inches shorter than a Muncie transmission
• Works with standard two-lever shifters
• Laser-cut CNC-machined steel bellhousing for precise fit
• Heavy-duty racing components throughout

Gear Ratios

• Low Gear: 2.40:1
• High Gear: 1.00:1 (Direct Drive)
• Reverse: Included
• Neutral: Yes

Specifications

• Brand: Bert Transmission
• Model: LMZ
• Transmission Type: 2-Speed Racing Transmission
• Application: Chevy Small Block 2-Piece Rear Main Seal
• Torque Capacity: 600 lb-ft
• Case Material: Aluminum
• Input Shaft Diameter: 1.0625 inches
• Input Shaft Spline Count: 10
• Output Shaft Diameter: 1.375 inches
• Output Shaft Spline Count: 27
• Output Style: Slip Yoke
• Shifter Style: Linkage Operated
• Bellhousing Included: Yes
• Shifter Included: No
• Yoke Included: No
• Overall Design: Approximately 2-5/8 inches shorter than Muncie-style transmissions

Kit Includes

• Bert LMZ Aluminum 2-Speed Racing Transmission
• Steel Bellhousing for 2-Piece Rear Main Applications
• Steel Drive Flange for 2-Piece Rear Main Chevy Engines
• Bellhousing Bolt Kit
• Braided Stainless AN-4 Clutch Line
• Racing Transmission Fluid
• Installation Hardware
• Manufacturer Documentation

Recommended Applications

Ideal for:

• IMCA Modified
• IMCA Stock Car
• Dirt Late Model
• Hobby Stock
• Street Stock
• Circle Track Racing
• Crate Engine Racing
• Asphalt Modified
• Custom Race Cars

Compatible with 1955–1985 Chevrolet Small Block V8 engines equipped with a 2-piece rear main seal.

Installation Requirements

Installation may require:

• Standard two-lever racing shifter
• Slip-yoke driveshaft
• Transmission mount
• Racing crossmember
• Racing clutch linkage
• Proper transmission fluid
• Professional drivetrain alignment

Professional installation is recommended for optimum performance and reliability.

Warranty

The Bert LMZ Transmission Kit for 2-Piece Rear Main Seal is backed by a 1-Year Limited Warranty, covering defects in materials and workmanship under normal racing use and proper installation.

Why Choose the Bert LMZ Transmission Kit?

The Bert LMZ Transmission Kit is a proven choice for serious circle track racers seeking maximum power transfer and reliable performance. Its internal clutch assembly, lightweight aluminum construction, dog-tooth gear design, 600 lb-ft torque capacity, and direct-drive high gear provide faster acceleration, smoother shifting, and outstanding durability. Complete with a precision-fit bellhousing and installation components, this kit is ready to help your race car perform at its best.