TREMEC TR-4050 5-Speed Conversion Kit for 1967–1972 Chevy & GMC K-Series 4x4

Bring modern performance to your classic truck with the TREMEC TR-4050 5-speed conversion kit for 1967–1972 K-Series. Designed for Chevy and GMC 4x4 trucks, this K10/K20 transmission swap delivers exceptional off-road capability, improved highway drivability, and the strength needed for demanding builds.

With a 6.16:1 ultra-low first gear for rock crawling and a .76 overdrive for reduced RPM on the highway, the TR-4050 5-speed for classic Chevy trucks provides unmatched versatility. Built to handle up to 600 lb-ft of torque, this Chevy K-Series transmission upgrade is ideal for stock restorations, LS swaps, and high-performance applications.

Benefits of the TR-4050 5-Speed for K-Series Trucks

• 6.16:1 low first gear for rock crawling and off-road control
• 6.03 reverse gear for maneuvering in tight terrain
• .76 overdrive 5th gear for highway cruising and fuel savings
• Smooth, precise shifting with excellent performance feel
• Reduced NVH for improved comfort at speed
• Ideal 5-speed swap for K10 and K20 trucks

TREMEC TR-4050 Gear Ratios

6.16, 3.11, 1.71, 1.00, 0.76, and 6.03 Reverse

TR-4050 Conversion Kit Components for K-Series 4x4

• TREMEC TR-4050 5-Speed Transmission
  • 600 lb-ft torque capacity for high-performance builds
  • Brand new transmission – no rebuilt or remanufactured parts
  • Helical-cut gears for strength and quiet operation
  • Die-cast aluminum housing for durability and weight savings
  • 6-bolt PTO provision for accessories
  • Internal rail shifter system for precise shifting
  • Tapered bearings for improved longevity
  • Needle bearings reduce friction and wear
  • Fully synchronized gears for smooth operation
  • Advanced synchronizers for easier shifting
  • Optimized overdrive design reduces noise and vibration
  • 3.67 qt fluid capacity
• Pilot bearing
• Complete installation hardware
• Reverse light wiring pigtail
• Crossmember mount template
• Step-by-step instructions
• Factory warranty

Optional Parts for Manual Conversion & Upgrades

• McLeod billet flywheel for durability and safety
• McLeod performance clutch kit for smooth engagement
• Bellhousing kit for proper fitment
• Hydraulic clutch conversion kit
  • Master cylinder
  • Heavy-duty slave cylinder (1,000,000 cycle life)
  • Pre-engineered firewall mount
  • Remote reservoir
  • Braided steel line
  • Pedal linkage and hardware
• Shifter boot and trim ring
• Shifter handle options
• 5-speed shift knob
• STX Shifter® short-throw shifter
• Transfer case adapter and linkage kit
• Mechanical linkage bracket
• Transmission and clutch fluids

*Required for automatic-to-manual conversions