Porsche 911 915 Carrera Transmission (7:31 LSD)

This Porsche 915 manual transmission is a highly desirable unit originally associated with the Porsche 911 Carrera (classic). Purchased new in 1979, it has reportedly covered only ~300 km since a professional rebuild, making it a standout option for collectors and performance-focused builds.

Equipped with a 7:31 ring and pinion and a limited slip differential (LSD), this gearbox delivers strong acceleration characteristics and improved traction, especially in spirited driving conditions.

Key Features

• Model: Porsche 915 transmission
• Application: Porsche 911 Carrera (classic)
• Ring & Pinion: 7:31 (short gearing for acceleration)
• Differential: Limited Slip Differential (LSD)
• Spline Type: Coarse spline configuration
• Gear Ratios: Standard Carrera ratios
• Mileage: ~300 km since rebuild

Why It’s Special

• 7:31 gearing is highly sought-after for its quick acceleration and responsiveness
• LSD improves traction, corner exit stability, and overall performance
• Low mileage since rebuild adds reliability and value
• Classic 915 transmissions are essential for period-correct Porsche restorations

Performance Benefits

• Faster acceleration due to shorter final drive
• Enhanced grip from LSD during aggressive driving
• Strong, mechanical driving feel typical of classic 911s
• Ideal balance between street usability and track performance

 What’s Included

• 1 × Porsche 915 transmission assembly
• Integrated limited slip differential
• Internal gearset (standard ratios)

 Why Choose a 915 with 7:31 LSD?

• One of the most desirable configurations of the 915 gearbox
• Combines classic Porsche driving feel with enhanced performance
• Strong collector demand
• Perfect for authentic, high-performance 911 builds