600 lb-ft torque capacity for high-performance street and strip builds, Compact, end-loaded design fits most tunnels without modification, Smooth, high-RPM shifting capability up to 7,500+ RPM, Multi-cone synchronizers with hybrid bronze/carbon rings for superior shift quality, High-strength 3-piece aluminum case for rigidity and durability TREMEC TCET17805 TKX 5-Speed Manual Transmission GM Mount Sku # 91029046 Mfr. Part # TCET17805 Condition New Brand TREMEC Sold Each Details
The TREMEC TCET17805 TKX 5-speed manual transmission is purpose-built for the aftermarket, delivering a compact, high-performance solution for GM-based builds, restorations, and custom applications. Designed with modern engineering and superior shift performance in mind, the TKX is an ideal upgrade for classic muscle cars, restomods, and street-driven performance vehicles.
Featuring a compact, end-loaded design, the TKX fits most transmission tunnels with little to no floor pan modification. Its advanced internal design includes multi-cone synchronizers and hybrid carbon/bronze synchro rings, providing smooth, precise shifting even at high RPMs up to 7,500+ RPM—perfect for today’s performance engines.
Built for durability, the TKX utilizes a rigid 3-piece aluminum housing, optimized gear geometry, and high-strength internal components to support up to 600 lb-ft of torque. Combined with a GM mount configuration, this transmission offers excellent drivability, flexibility, and long-term reliability for a wide range of applications.
- 600 lb-ft torque capacity for high-performance street and strip builds
- Compact, end-loaded design fits most tunnels without modification
- Smooth, high-RPM shifting capability up to 7,500+ RPM
- Multi-cone synchronizers with hybrid bronze/carbon rings for superior shift quality
- High-strength 3-piece aluminum case for rigidity and durability
- Short-throw billet shifter for crisp, precise gear engagement
- Multiple shifter position options for flexible installation
- GM mount configuration for easy compatibility
- 26-spline input shaft with 31-spline output for added strength
Gear Ratios:
2.87 | 1.89 | 1.28 | 1.00 | 0.68 (Rev 2.56)
Specs Transmission Speeds 5-Speed Torque 600 ft./lbs. Input Shaft Spline Count 26 Input Shaft Diameter 1.125" Output Shaft Spline Diameter 1.375" Output Shaft Spline Count 31 Case Material Aluminum First Gear Ratio 2.87:1 Gear Ratio (2nd) 1.89:1 Gear Ratio (3rd) 1.28:1 Gear Ratio (4th) 1.00:1 Gear Ratio (5th) 0.68:1 Gear Ratio (6th) Not Applicable Bellhousing Included No Yoke Included No GTIN Code 041969292075 Shifter Included No Gear Ratio (Low) Not Applicable MFG. Part # TCET17805 Gear Ratio (Reverse) 2.56:1 Gear Ratio (High) Not Applicable Sold in Quantity Each Tailshaft Length No Value Yoke Style Slip On Shifter Style Linkage operated Reviews Awesome transmission Rated by Dad's 50 on January 05, 2026
Summary: My gm 454 future gear box, after lots of research this was the best fit for me to throw behind mid performance 454 and very pleased with the quality of this gearbox, low profile design, has multiple ways to mount the shifter housing to fit a wide range of placement in vehicle, good instructions are included
Yes, I recommend this product.
So far, so good Rated by Arthur on September 10, 2025
Summary: Mated to a Ford flathead V8.
Yes, I recommend this product.
I highly recommend TKX 5SPD transmission Rated by intimidator on June 24, 2025
Summary: I replaced my muncie 4spd. with the TKX 5spd in my 69 camaro. Easy installation with no modification to floor. Will make those rod runs and long trips more enjoyable. With overdrive its much easier on motor when running interstate speeds a even a little better fuel economy.
I've bought 2 for my cars . Rated by Hot Rod Dougie. on March 06, 2025
Summary: One of the best things you can do for your car and your wallet at the gas pump. All party 1-4 and quiet low RPM cruising in 5th. 2300 RPM in 5th at 80 MPH and you can hear the radio or actually have a conversation in your car. I'm running a non-quiet exhaust system.
Yes, I recommend this product.
Even better than the old tko 600¹ Rated by Jack on February 02, 2025
Summary: Nice compact and lightweight transmission even more so than the tko 600 this thing replaced.
Yes, I recommend this product.
Related Items / Suggested Parts Tremec TKX Manual 5-Speed Transmission for Chevy 350/305 SoloSwap® Tremec TKX 5-Speed Swap Mockup Transmission Tech Support We're here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
