TREMEC TDET18574 TR-4050 5-Speed Transmission GM 2WD

The TREMEC TDET18574 TR-4050 5-Speed Transmission GM 2WD is a heavy-duty manual transmission engineered specifically for GM rear-wheel-drive trucks, SUVs, restomods, and custom performance builds. Designed as a modern replacement for older truck transmissions, the TR-4050 combines exceptional strength, smooth synchronized shifting, and a deep low first gear that delivers outstanding pulling power for towing, off-road-inspired builds, and high-torque street applications.

Built to handle 600 lb-ft of torque, the TR-4050 features a 6.16:1 granny low first gear, 0.76 overdrive, and fully synchronized forward gears, eliminating the need for double-clutching. A lightweight die-cast aluminum case, carbon-lined synchronizers, tapered roller bearings, and high-strength helical gears provide exceptional durability while maintaining smooth, quiet operation. The transmission also includes a GM input shaft, 26-spline input, 31-spline output, integrated shifter, and a 6-bolt PTO provision for hydraulic pumps or auxiliary accessories.

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Features

• Genuine TREMEC TDET18574 TR-4050 5-Speed Manual Transmission
• Designed for GM 2WD truck applications
• Heavy-duty 600 lb-ft torque capacity
• Deep 6.16:1 granny low first gear
• Fully synchronized forward gears
• Smooth carbon-lined single and double-cone synchronizers
• Lightweight die-cast aluminum housing
• High-strength constant-mesh helical gears
• Heavy-duty tapered roller bearings on all shafts
• Multiple-rail shifter for precise gear engagement
• Integrated shifter assembly included
• Single overdrive for reduced highway engine RPM
• Right-side 6-bolt PTO mounting provision
• Excellent for towing, hauling, work trucks, and restomod builds

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Gear Ratios

• 1st Gear: 6.16:1
• 2nd Gear: 3.11:1
• 3rd Gear: 1.71:1
• 4th Gear: 1.00:1
• 5th Gear: 0.76:1
• Reverse: 6.03:1

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Specifications

• Brand: TREMEC
• Manufacturer Part Number: TDET18574
• Model: TR-4050
• Transmission Type: 5-Speed Manual
• Application: GM 2WD
• Drive Type: Rear-Wheel Drive
• Torque Capacity: 600 lb-ft
• Case Material: Die-Cast Aluminum
• Input Shaft Diameter: 1.125 Inches
• Input Shaft Spline Count: 26
• Output Shaft Diameter: 1.375 Inches
• Output Shaft Spline Count: 31
• Gear Design: Constant Mesh Helical
• Synchronizers: Carbon Friction Single & Double Cone
• Speedometer Output: Electronic
• PTO Provision: 6-Bolt Right Side
• Shifter Included: Yes
• Yoke Included: No
• Bellhousing Included: No
• Recommended Fluid: TREMEC HP-MTF or manufacturer-approved manual transmission fluid
• Dry Weight: Approximately 135 lbs

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Package Includes

• TREMEC TDET18574 TR-4050 5-Speed Manual Transmission
• Integrated Shifter Assembly
• Front Bearing Retainer
• Internal Shift Components
• Installation Documentation

Bellhousing, clutch kit, flywheel, hydraulic release bearing, transmission mount, crossmember, slip yoke, driveshaft, and transmission fluid are sold separately unless otherwise specified.

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Recommended Applications

Ideal for:

• Chevrolet C10
• Chevrolet C20
• Chevrolet C30
• Chevrolet Silverado 2WD
• Chevrolet Custom Truck Builds
• GMC C1500
• GMC C2500
• GMC C3500
• Street Trucks
• Restomod Trucks
• High-Torque LS Truck Swaps
• Work Trucks
• Towing Applications
• Custom Hot Rod Trucks

Compatible with GM rear-wheel-drive applications using the appropriate GM bellhousing, clutch system, and driveline components.

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Installation Requirements

Installation may require:

• GM-compatible bellhousing
• 26-spline clutch disc
• Hydraulic clutch master cylinder
• 31-spline slip yoke
• Transmission crossmember
• Transmission mount
• Driveshaft modification depending on vehicle
• TREMEC HP-MTF or approved manual transmission fluid

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

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Warranty

The TREMEC TDET18574 TR-4050 5-Speed Transmission GM 2WD is backed by a 1-Year Limited Warranty, covering defects in materials and workmanship under normal use and proper installation. Warranty support is provided directly through TREMEC.

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Why Choose the TREMEC TDET18574 TR-4050?

The TREMEC TDET18574 TR-4050 is the ideal heavy-duty manual transmission for GM truck enthusiasts who demand strength, reliability, and modern drivability. Featuring a 600 lb-ft torque rating, 6.16:1 granny low first gear, 0.76 overdrive, carbon-lined synchronizers, tapered roller bearings, and a lightweight aluminum housing, it delivers exceptional pulling power, smooth shifting, and dependable performance for towing, hauling, off-road-inspired builds, and custom GM truck restorations.