1979-2004 Mustang Tremec TKX Transmission - 26 Spline - .72 Overdrive by Tremec

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1979-2004 Mustang Tremec TKX Transmission - 26 Spline - .72 Overdrive

Bulletproof your drivetrain with Tremec's 1979-2004 Mustang 26 spline TKX transmission with .72 ratio overdrive!

Item #LRS-18085
MPN# TCET18085

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Benefits

Extreme Durability
Optimized Gear Layout
600lb-ft Torque Capacity
8000 RPM Shifting Capability
Provides Smooth, Superior Shift-Ability

Features

Wide Gear Ratio
26 Spline Input Shaft
31 Spline Output Shaft
Multi-Cone Synchronizers
7 Tooth Internal Drive Gear

What's in the Box

(1) Tremec 5-Speed TKX Transmission

Mustang Tremec TKX Transmission

Ensure your transmission can handle the extra power your engine puts down with this 1979-2004 Mustang Tremec TKX transmission! Designed to be the successor to the TKO transmission, the TKX features triple cone synchronizers with a non-leading tooth profile (taken from the T56) to eliminate the notchy feeling the TKO had. With the provided billet aluminum, short-throw shifter you'll experience buttery smooth shifts all the way up the extended RPM range! The TKX is capable of 8,000 RPM engine speeds with shifts at 7,500 RPMs. An updated end loading design provides improved strength along with a new case for increased tunnel clearance making fitment issues a thing of the past. This TKX has the .72 overdrive 5th gear which is ideal for cars that see regular highway use. Built to handle 600lb/ft of torque, this is the next generation of performance transmission.

Tremec Quality

Utilizing the highest-quality materials, this TKX transmission is durable and built to last. The synchronizers are built with a sintered bronze and carbon material that provide smooth shifts without sacrificing strength. Tremec optimized the gear layout to control stress levels and NVH, while providing structural stiffness with a ribbed 3-piece housing. A 7.2" length, 26-spline input shaft is combined with a 31-spline output shaft for added strength. Each gear is made with a high-grade steel (ASTM 4615) which results in the 600lb/ft torque capacity. Tremec uses tapered roller bearings on every shaft along with a caged needle bearing on the main shaft to reduce noise. To further optimize durability, oversized gear widths are used, along with gaskets at all flanges. The TKX will hold 2.7 quarts of manual transmission fluid. All of these improvements and more provide you a bulletproof transmission that's built to handle anything you throw at it!

TKX Gear Ratios

1st - 3.27
2nd - 1.98
3rd - 1.34
4th - 1.00
5th - 0.72

Transmission Note

Input shaft is 26 spline
Output shaft is 31 spline
For all TKX 5-speed models, TREMEC recommends TREMEC High-Performance Manual Transmission Fluid (HP-MTF™), Dexron-III, GM Synchromesh™, Mobil 1 Synthetic ATF, or Pennzoil® Synchromesh.
Fluid capacity is 2.7 quart
You will need to either transfer your factory shift handle and shift ball or pick up a new set!
Machining marks on transmission mount boss may be present.

Application

Fits 1979-2004 Ford Mustang (See Fitment Notes Tab)

TREMEC Transmission Limited Warranty - Click Here

Ford Mustang - 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004

1979-1995 - 5.0L

Bellhousing LRS-6392A or RM-6065
1979-93 Requires cross member STF-TCBM01
1994-1995 Mustang V8 requires cross member STF-TCBM03
1994-1995 Mustang V8 will need to lengthen driveshaft .625" or install a driveshaft spacer
31 Spline Driveshaft M4602J or Slip Yoke M236041X
26 Spline Clutch for TKX 26 Spline input shaft

1996-1998 - 4.6L

1994-1998 Mustang V8 requires cross member STF-TCBM03
Bellhousing M-6392-M46 or RM-6081
Drive Shaft Spacer may be necessary
26 Spline Clutch for TKX 26 Spline input shaft

1999-2004 - 4.6L

Crossmember STF-TCBM20
Bellhousing M-6392-M46 or RM-6081
Speed pickup conversion for mechanical speed pickup to electrical.
Drive Shaft Spacer may be necessary
2003-2004 Cobra would require 31 Spline Driveshaft M4602J
2003-2004 Cobra would have to convert the pinion flange with the driveshaft
26 Spline Clutch for TKX 26 Spline input shaft

The All-New TREMEC TKX

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Service Manual

Download the pdf Link opens in a new window

Mustang Tremec TKX Transmission Swap Guide

Adding power to any car is a hassle to put the power to the wheels through the stock transmission. That is why many turn to the Mustang TKX Swap, follow along and we will guide you on all of the needed steps for this swap. more

Posted on 4/20/2022

Transmission Gearing Explained

When choosing a new transmission, gear selection will play an important role in the driving characteristics of your Mustang. more

Posted on 2/10/2023

California Residents:

WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

Ship Weight: 143 lbs

About This Brand

Tremec is one of the industry leading manufacturers of performance manual transmissions. They have spent years researching and developing the highest quality torque transfer solutions. Tremec provides world class products to the global automotive and industrial markets. With a wide range of Tremec transmissions available for the Ford Mustang, Latemodel Restoration is proud to offer the Tremec Magnum XL 6 speed transmission!