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Upgrade Your GM Build to a TREMEC TKX 5-Speed – 600 lb-ft Torque, Deep .68 Overdrive & 7,500 RPM Shifts!

If you are ready to transform the driving dynamics of your GM-powered classic, muscle car, or custom restomod, the TREMEC TKX 5-Speed Manual Transmission (TCET17805) is the ultimate drivetrain solution. Engineered specifically for the high-performance aftermarket, this robust GM-specific TKX 5-speed combines an upgraded 26-spline input shaft with a deep, fuel-saving .68 overdrive gear. It is built from the ground up to reliably handle 600 lb-ft of torque and execute crisp, flawless shifts at a screaming 7,500 RPM. Whether you are replacing a legacy Muncie 4-speed, upgrading an overworked factory T5, or dropping a high-horsepower crate engine into a classic chassis, this wide-ratio manual transmission delivers modern strength where it matters most.

What are the Specifications of the TREMEC TKX TCET17805?

• Part Number: TCET17805
• GM-Specific Input Shaft: 26-Spline (Upgraded from legacy 10-spline configurations; requires a matching 26-spline clutch disc)
• Output Shaft: 31-Spline
• Torque Capacity: Rated for up to 600 lb-ft of torque
• RPM Capability: Certified for clean, high-RPM shift points up to 7,500 RPM
• Shifter Versatility: Three mounting locations built into the case for flexible console layout alignment (custom front shift kits available from SST!)
• Warranty Protection: 12-Month Factory Warranty backed directly by TREMEC

GM Wide-Ratio Gear Ratios:

• 1st: 2.87
• 2nd: 1.98
• 3rd: 1.28
• 4th: 1.00 (Direct drive)
• 5th: 0.68 (Deep, fuel-saving highway overdrive that drastically reduces cruising RPM)

How Does the TREMEC TKX Improve Shift Quality and Fitment in GM Applications?

The TREMEC TKX solves the historic packaging and high-RPM shifting limitations of vintage gearboxes. By blending bulletproof internal strength with modern, smooth-shifting synchronizer technology, it delivers a driving experience that elevates any pro-touring or classic street machine.

• Streamlined Fitment: The compact, end-loaded aluminum design easily fits inside tight vintage GM transmission tunnels (Chevelle, Camaro, Nova, Corvette) without requiring extensive, invasive floor pan modifications.
• Maximum Case Rigidity: A heavy-duty, 3-piece aluminum housing minimizes internal flex to keep your gear engagement perfectly aligned under high-torque acceleration.
• Crisp, Precise Shifts: Features an integrated, billet aluminum short-throw shifter that delivers tight, mechanical gear changes while isolating cabin road noise and vibration.
• Advanced Synchronizers: Hybrid multi-cone synchronizers featuring sintered bronze and carbon rings allow you to effortlessly grab the next gear at high revs without grinding.
• Quiet, Refined Cruising: An NVH-optimized (Noise, Vibration, and Harshness) helical gear layout ensures a incredibly quiet ride on long-distance highway hauls.
• Leak-Free Integrity: Premium gaskets at all major housing faces guarantee a clean, oil-tight installation in your home garage or professional shop.
• Restomod-Ready Electronics: Includes integrated connections for a reverse light switch and a cruise control safety switch to easily interface with modern wiring harnesses.

Why Choose the TKX TCET17805 Over a Vintage Muncie, Saganaw, or Factory T5?

The TREMEC TKX isn't just an incremental replacement—it is a complete mechanical revolution for your GM project. Vintage 3-speed and 4-speed manual transmissions force your engine to scream at unsustainably high RPMs at modern highway speeds, causing premature engine wear and driver fatigue. On the other hand, stock factory T5 transmissions will quickly shatter when exposed to the high torque loads of modern small-block, big-block, or LS/LT V8 crate engines.

Choosing the heavy-duty 26-spline input shaft of the TCET17805 provides significantly more shear strength at the clutch disc interface compared to traditional vintage GM 10-spline 4-speed configurations, offering ultimate reliability during hard launches. With modern internal geometry, OEM-level durability standards, and track-tested precision, the TKX is the absolute gold standard for GM restomods. It is the perfect gearbox upgrade for iconic platforms like the Chevrolet Camaro, Chevelle, Nova, Corvette, Pontiac Firebird, GTO, and custom C10 trucks.

Why should you purchase your TREMEC TKX from Silver Sport Transmissions?

Customer service comes first at Silver Sport Transmissions, with a live person answering the phone, knowledgeable sales and technical support technicians ready to answer your questions, and a top-notch production team making sure your order is accurate and safely packaged.

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