Brinn Transmission Kit for 1 Piece Rear Main Seal

The Brinn Transmission Kit for 1-Piece Rear Main Seal is a complete lightweight racing transmission package designed specifically for 1986-up Small Block Chevrolet (1-piece rear main seal) engines. Engineered for competitive oval track and dirt track racing, this kit combines Brinn’s proven 2-speed racing transmission with the essential installation components required for a professional drivetrain setup.

Designed to reduce rotating mass while maximizing durability, the Brinn transmission features a lightweight aluminum case, cryogenically treated gears and shafts, and an advanced internal dog-clutch design that delivers quick, precise shifts under demanding racing conditions. By eliminating the need for a conventional clutch assembly and throwout bearing, the transmission improves throttle response, reduces drivetrain weight, and minimizes maintenance.

The included heavy-duty steel bellhousing is compatible with both Small Block Chevrolet (SBC) and Small Block Ford (SBF) engine bolt patterns. Precision laser-cut and CNC-machined construction ensures excellent alignment and durability while adapting engines to Muncie and Saginaw transmission bolt patterns, including Brinn, Bert, Falcon, and similar racing transmissions.

Whether you’re building a Wissota Modified, IMCA Modified, Sport Mod, Hobby Stock, or other circle track race car, this complete transmission kit provides reliable performance, easy installation, and race-proven durability.

Features

• Complete Brinn Racing Transmission Installation Kit
• Fits 1986-up Small Block Chevrolet engines with 1-piece rear main seal
• Lightweight aluminum 2-speed racing transmission
• Rated for up to 600 lb-ft of torque
• Internal dog-clutch design for fast, positive shifts
• Cryogenically treated gears and shafts for maximum durability
• Eliminates conventional clutch and throwout bearing assembly
• Heavy-duty steel bellhousing included
• Fits both SBC and SBF engine bolt patterns
• Compatible with Muncie and Saginaw transmission patterns
• Laser-cut CNC-machined bellhousing
• Bottom inspection opening for easy maintenance
• Designed exclusively for competition use

Specifications

• Brand: Brinn
• Manufacturer Part Number: 91606161
• Transmission Type: Racing Manual
• Number of Speeds: 2
• Torque Capacity: 600 lb-ft
• Case Material: Aluminum
• Input Shaft: 10-Spline
• Input Shaft Diameter: 1.0625″
• Output Shaft: 27-Spline
• Output Shaft Diameter: 1.375″
• Low Gear Ratio: 1.88:1
• High Gear Ratio: 1.00:1
• Reverse Gear Ratio: 2.29:1
• Shifter Style: Linkage Operated
• Yoke Style: Slip-On
• Bellhousing Included: Yes
• Shifter Included: No
• Yoke Included: No

Kit Includes

• Brinn 2-Speed Racing Transmission
• Steel Bellhousing
• Bellhousing Bolt Kit
• Steel Drive Flange for 1-Piece Rear Main Seal
• ARP Crankshaft Bolts
• 60-Inch Brake Line
• Straight AN Adapter Fitting
• Performance Transmission Fluid
• Transmission Storage Stand
• Installation Hardware

Recommended Applications

Designed for race vehicles equipped with 1986-up Small Block Chevrolet engines featuring a 1-piece rear main seal, including:

• IMCA Modified
• Wissota Modified
• Midwest Modified
• Sport Mod
• Hobby Stock
• Dirt Modified
• Stock Car
• Circle Track Race Cars
• Oval Track Competition Vehicles

This transmission is intended for competition use only and is not designed for street-driven vehicles.

Installation Requirements

Depending on your race car setup, installation may require:

• Compatible racing driveshaft
• Slip yoke
• Racing shifter linkage
• Transmission mount
• Approved transmission fluid
• Proper engine and driveline alignment

Professional installation is recommended to ensure maximum performance and reliability.

Warranty

The Brinn Transmission Kit for 1-Piece Rear Main Seal is backed by a 3-Year Limited Warranty, covering defects in materials and workmanship under normal competition use when properly installed and maintained.