Hanlon Motorsports Tremec TKX Transmission Package – 79-81 Ford Mustang 5.0L SBF, Manual Transmission (650HP or Less)


  • Complete TKX 5 speed transmission kit for 79-81 Ford Foxbody’s with 650HP or Less
  • Fits 79-81 Ford Mustang equipped with a 5.0L SBF Engine
  • Simplify the buying process with this complete bolt on kit

Why the Tremec TKX 5-Speed? Follow along here with NeoMustangs while he test it’s limits!



This TREMEC TKX transmission package is designed for the 79-81 Ford Mustang Foxbody’s equipped with a SBF engine and manual transmission combination making 650hp or less. Included in this kit is everything to correctly swap out your Borg Warner / Tremec T5 manual transmission to a new Tremec TKX 5-Speed transmission.

  • NOTE: Factory automatic 79-93 Mustang’s, an underdash MalWood hydraulic clutch pedal assembly kit – HMS-MUS-79-93-AUTO is available to make this package 100% compatible.

This complete manual transmission package features the proven Tremec TKX 5-speed transmission, which can-  handle up to 600 lb-ft. of torque. Widely known as the most popular and versatile 5-speed transmission in the industry, the TKX features multiple shifter locations and both manual and electronic speedometer pick ups. The 3-rail internal shift mechanism provides a solid, stout shift every time.

Package Includes:

  • (1) TREMEC TKX 5-Speed Manual Transmission
  • (1) Tremec TKO/TKO Aluminum Bellhousing – TCEP8639
  • (1) RAM Clutches PowerGrip HD Clutch Kit – 98794HDT
  • (1) RAM Clutch Pilot Bearing
  • (1) Ford Performance Pressure Plate Bolt & Dowell Kit 10.5″
  • (1) Stifflers Crossmember Kit
  • (1) Energy Suspension Polyurethane Transmission Mount
  • (1) Stifflers Crossmember Install Kit
  • (1) Inland Empire Driveline 1330-Joint 31-Spline Driveshaft Yoke
  • (1) Bell to Bellhousing Bolt Kit

TREMEC TKX 5-Speed Manual Transmission

For the development of the new transmission, TREMEC engineers took a forward-looking approach to finding the best and most efficient solution. This included universal packaging, excellent shifting performance, and extreme durability.

The end result is superior shift-ability with smooth shifts at high RPMs through the use of multi-cone synchronizers and hybrid synchronizer rings. At the same time, noise, vibration and harshness (NVH) performance is optimized with a gear layout to best control stress levels, while providing structural stiffness with a ribbed, 3-piece aluminum housing. Durability is further optimized with oversized gear widths, gaskets at all flanges and caged needle bearings in all gear positions.

Whether restoring or upgrading a classic muscle car or a 1930s-era roadster coupe, the new TREMEC TKX 5-speed RWD manual transmission delivers a top-quality drivetrain solution.

  • The TKX has 600 lb.-ft. of torque capacity and is capable of engines speeds of 8,000 RPMs with shifts at 7,500 RPMs.
  • Designed for multiple applications with three shifter locations. Compact, end-loaded design provides clearance in most transmission tunnels without floor modifications.
  • Increased case strength with three-piece aluminum housing provides outstanding structural stiffness (includes main case, intermediate plate and rear extension). Gaskets at all flanges simplifies installation and eliminates fluid leaks.
  • Superior shift-ability through use of multi-cone synchronizers and hybrid synchronizer rings made of sintered bronze and carbon
  • Noise, vibration and harshness (NVH) minimized with gear layout to best control stress levels. All gears supported by caged needle bearings to reduce end play on the gears.
  • All gears and shafts made from special grade steel (ASTM 4615) providing increased torque carrying capacity.
  • Equipped with a high-performance short-throw billet aluminum shifter that isolates road noise, while providing clean, crisp shifts.
  • Robust design with internal three-rail shift system and steel shift forks.
  • Wide gear width increases gear life and torque capacity.
  • 26-spline input shaft with a 31-spline output shaft for added strength.
  • Built-in reverse light switch and cruise control safety switch.
  • Gear Ratios

RAM Clutches PowerGrip HD Clutch Kit – 98794HDT:

  • Rated up to 650 horsepower
  • 10.5 x 1-1/16″ x 26 spline
  • Includes Pressure Plate, Clutch Disc, Release Bearing, and Alignment Tool
  • 8 Spring Helix Hub
  • 900 Series Metallic Disk
  • Ideal For Street / Strip

Tremec TKO / TKX Aluminum Bellhousing:

  • Fits 1979-1993 5.0L or 5.8L with 3550, TKO 500/600, TKX Transmissions
  • Cast Aluminum Construction
  • Fits 157T Flywheels Only
  • Includes Pivot Stud
  • Does Not Include Engine Block Plate

Stiffler’s Crossmember Kit:

  • Fits 79-81 Ford Mustangs With T5, TKO 3550, TKO 500/600 & TKX
  • Strong, Compact & Lightweight Design
  • Allows More Exhaust Clearance Than OEM Style
  • Direct Fit To OEM Crossmember Mounts, NO FABRICATION REQUIRED!
  • Works With SETBACK Engines
  • Powder Coated For Endurance


  • Stiffler’s Crossmember Install Kit
  • Ram Clutches Pilot Bearing
  • Ford Performance 10.5″ Pressure Plate & Dowell Kit
  • Energy Suspension Polyurethane Transmission Mount
  • Inland Empire Driveline 1330 Joint 31-Spline Driveshaft Yoke
  • Transmission to Bellhousing Bolt Kit

Additional information

Weight 120 lbs
Dimensions 35 × 15 × 18 in
Available Transmission Models

TCET17765 – 2.87 1st Gear, .68OD, TCET18084 – 2.87 1st Gear, .81OD, TCET18085 – 3.27 1st Gear, .72OD

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