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Transmissions
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The Mustang was available with four different manual transmissions between 1994 and 2004, depending on the engine and model year. Ford sourced these transmissions first through Borg Warner, which was purchased by the Mexico-based Tremec company in the mid 1990s. Initially, the 1994 and 1995 Mustangs were available with the T-5 5-speed transmission popularized in the Fox- body Mustang. The V-6 came with the T-5 through the ’04 model year, but the 4.6L V-8 debuted in ’ 96 with the T-45 5-speed transmission. The 4.6L Mustang received an upgraded 5-speed, the T- 3650, beginning in mid-2000 model year. The 2000 Cobra R and the ’03-’04 supercharged Cobra each used a different version of the T-56 6-speed transmission. Automatic transmissions offered in the Mustang included the AODE on the ’94-’95 Mustang, which evolved into the 4R70W electronic overdrive transmission used from ’96 until ’04 on the GT. The ‘03-’04 Mach 1 used an upgraded version of that transmission known as the 4R75W. So, now that you have the background, let’s get inside them.
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T-5 5-Speed
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The T-5 World Class 5- speed transmission is standard equipment in the ’94-’95 Cobra.
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The T-5 5-speed manual overdrive transmission was used in ’94-’95 5.0L V-8 cars and all V-6 cars from 1996 to 2004. The T5 has a separate bellhousing that can be removed from the main transmission case, unlike the T-45 where the bellhousing is an integral part of the transmission case. The input shaft has a 10-spline input, and the World Class V-8 transmission is rated at 335 ft- lbs torque capacity.
While reasonably robust, these transmissions can be prone to failure as power output is increased. In particular, third gear seems to fail when abused. The shift forks can get bent or broken from power shifts, and the synchronizer cones often get chipped or burred teeth from hard shifting. Some of these problems can be helped with a good aftermarket shifter, such as the ones manufactured by Steeda and Hurst. In addition to providing a shorter, more positive shift, adjustable shift stops allow the driver to bang home the gears without bending the shift forks. Serious drag race and open track types can now get dog-box conversions of the T-5. These upgraded transmissions have the stock synchronizers replaced with positive-engagement dog drives, just like custom race boxes have. Although impractical for the street, these do offer the ultimate in speed shifting potential, and are extremely durable in high-power situations. A number of transmission specialists are around now, such as G-Force and Liberty, who can handle T-5 rebuilds and upgrades.
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T-45 and T-3650 5-Speeds
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The T-45 5-speed has been used in the 4.6L Mustang GT and Cobra from 1996 until mid 2001, when it was replaced by the T-3650.
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The T-45 transmission was used on the 4.6L V-8 powered Mustangs from 1996-2000. An upgraded version, called the T-3650, was released in mid 2000 and used through the 2004 model year. The Mustang changed in 1999 from a mechanical to an electronic speedometer output. Keep this in mind if you’re planning a gear swap.
The early T-45 transmissions were not noted for their reliability, especially behind the Cobra engine. Although the stock 2-valve engines were not too hard on the T-45, they started breaking once the owners started adding superchargers and nitrous. As usual, some owners can get more life from their transmissions than others. I have a couple of clients with 500+ hp cars and after five or six years, they still have the original transmission, while others are on their third or fourth transmission. Honestly, some people could break a hammer in a sandbox!
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My favorite manual transmission story involves John Mihovetz, the fastest 4.6L drag racer for a number of years now. Some time ago, he was driving a Mustang with a Doug Nash 5-speed trans in it. While launching the car at a drag race, the driveshaft broke, and tore up the extension housing on the transmission where the shifter bolts on. It broke with such force, that the shifter, with John’s hand still holding on firmly, was forced upward at great speed. It hit the roof of the car, nicely denting the sheetmetal on the outside of the roof. Try explaining that one to the owner of the car! Anyway, after a couple of interim upgrades over the years, Ford replaced the T-45 with a T-3650 in mid-2000 model year. These transmissions were indeed more robust than the T-45, but it is still possible to hurt them with hard shifting and an abundance of torque.
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T-56 6-Speed
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Aftermarket T-56 six-speed transmissions are popular upgrades with Mustang enthusiasts. More is required to install one of these than just the transmission, however.
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The 2000 Cobra R, with its torquey 5.4L engine, was released with a T-56 6-speed transmission. The car didn’t particularly require six forward speeds, but the increased 440 ft-lb torque capacity of the T-56 gave reliability to what was essentially a factory-produced racecar.
Ford turned to the T-56 again in 2003 for the supercharged Cobra, which required a robust transmission to cope with the power of the supercharged engine. Unlike the 2000 Cobra R version, the ’03-’04 Cobra 6-speed had different gear ratios and a smaller output shaft, instead of the 28-spline output of the Cobra R’s T-56. However, it did come with a 10-spline input shaft, which has proved to be the Achilles heel of the T-56. Many high-output Cobras have simply twisted the input shaft off from too much torque. We first saw this phenomenon in road-race cars in 1999 with the T-45 5-speed trans. We had not seen this before, even on drag cars with slicks. Seemingly, the on-off action of the road-racecars eventually stressed the input shaft back and forth, causing the shaft to fail. Today, 26-spline input shafts are available from G-Force, and Don Walsh from D&D makes some high-capacity T-56 boxes from Viper cores, customizing them for the 4.6L. Dog-face gear engagement is also now available for the T-56 from G-force, and if you have the money, you can even get a full sequential T-56 from Quaife in England.
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Aftermarket Transmissions Let’s say you want a stronger manual transmission, but you don’t want to rebuild your stock unit. Well, Tremec has some aftermarket 5- and 6-speed transmissions for those Mustang owners wanting to upgrade.
Tremec’s latest offerings are the TKO 500 and TKO 600. The two different designations, 500 and 600, refer to the transmissions’ torque capacity, 500 or 600 ft-lbs, respectively. The 600 is available in either a wide-ratio setup, with a .64:1 overdrive ratio, or a .82:1 overdrive close-ratio box, which is better suited to road racing. Both are based on the previous TR3550 TKO, a heavy-duty 5-speed that previously was, well, a bit agricultural actually. The new version, however, is a vast improvement, having improved synchronizers and better shift quality. The TKO-600 come with a 26- spline input shaft, which requires a new clutch disc, but that’s not too much bother. The 500 and 600 also come with both electronic and mechanical speedometer outputs, covering all years of SN95 Mustangs with one application.
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The Tremec TKO 500 aftermarket 5-speed transmission is rated with a 500-ft-lbs torque capacity. A 26-spline input shaft version is also available, the TKO 600, which comes with 600-ft-lb torque capacity.
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You can get an aluminum bellhousing from Tremec for all of these transmissions to fit a 5.0L, 5.8L, or the 4.6/5.4L. Lakewood makes high-strength steel scatter shields, which are required by NHRA for drag racing. Steeda, Hurst, and others make upgraded shifters to fit the Tremec TKO transmissions, too. Tremec recommends either Dexron ATF transmission fluid or a GM synchromesh fluid. We have always felt that the synchromesh fluid performed better in the TKO, especially for motorsport activities.
In addition to the 5-speed transmission, Tremec also offers three aftermarket 6-speed transmissions designed to upgrade ’94-2004 Mustangs. One fits the ’94-’95 5.0L car, and the other two are for the ’96-’98 4.6L and the ’99-2004 4.6L, respectively, the difference being a mechanical or electronic speedometer output. The 6-speeds require some additional components for installation, like a shortened driveshaft, transmission mount, reverse solenoid wiring, etc. Installation kits are available from Sean Hyland Motorsport and D&D.
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Shifters The OEM shifter used in the Mustang can really benefit from an upgrade. Billet shifters from Hurst, Pro 5.0, and Steeda offer improved shift quality, shorter throws, and perhaps most importantly, adjustable external stops. These stops keep the internal shift forks from getting bent or cracked with a hard shift. A good shifter is usually among the first upgrades a Mustang owner makes.
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A short shifter like this billet Steeda Triax provides shorter, morepositive shifts. The adjustable positive stopsprevent hardshifting from bending or cracking the transmission shift forks.
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Clutch and Flywheel The clutch assembly is easily the most abused piece of equipment in a performance Mustang, but it’ s necessary for getting your power to the ground. The ’94-’95 5.0L, ’96-’98 Cobras, and ’96-’99 GT all used a 10.5-inch clutch assembly. In 1999, the Cobra switched up to an 11-inch clutch. The GT got the 11-inch upgrade in 2001, along with the T-3650 5-speed. The factory clutch assemblies are actually quite robust, easily accepting 100 additional horsepower, if not more, without undue failures. Once the clutch needs to be replaced, several reasonably priced choices are available.
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This Lakewood scattershield is a hydroformed one-piece bellhousing constructed of high-strength steel. It is designed to contain fragments in case of clutch/flywheel explosion.
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Previous | Next
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This has been a sample page from
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High-Performance Mustang Builder's Guide 1994-2004 by Sean Hyland
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High-performance ‘94-‘04 Mustangs represent the high-water mark for late- model Mustang enthusiasts. From the ’94-’95s with the 5.0L, through the ‘96-‘04 models with the 2- and 4-valve 4.6 Ls, to the Bullitt, Mach 1, and factory supercharged ’03-‘04 Cobras – never before has such a range of highly modifiable performance cars been available. These Mustangs were amazing performers straight from the factory, but they can be even better with the right combination of performance parts. Regardless of which ’94-’04 Mustang you start with, the availability of high- performance parts is unparalleled. You can build your Mustang for drag racing, road racing, or improved street performance – and High- Performance Mustang Builder’s Guide 1994-2004 will show you how! Author Sean Hyland uses over 300 photos to explain how to upgrade your Mustang’s engine, suspension, chassis, transmission, rear end, brakes, and body. There’s even a special chapter on getting active in various forms of organized racing.
Sean Hyland is the proprietor of Sean Hyland Motorsport, which builds and supports internationally competitive Mustangs for road racing, drag racing, and everything in between. Sean recently did a complete Mustang build-up for Speed Channel’s Sports Car Revolution and is also the author of the bestselling title How to Build Max-Performance 4.6-Liter Ford Engines.
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Click below to view sample pages from each chapter.
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Chap. 1 - Chassis Chap. 2 - Wheels and Tires Chap. 3 - Suspension Chap. 4 - Brakes Chap. 5 - 3.8 Engines Chap. 6 - 4.6 Modular Engines Chap. 7 - Transmissions Chap. 8 - Rear Axles Chap. 9 - Aerodynamics Chap. 10 - Safety Equipment Chap. 11 - Get Involved! Chap. 12 - Project Cars
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8-1/2 x 11" Sftbd. 144 pgs. 300+ color photos Item: SA106 Price: $22.95
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Click here to buy now!
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This is a great book that any Mustang enthusiast will enjoy!
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How To Build Max Performance 4.6 Liter Ford Engines Sean Hyland gives you a comprehensive guide to building and modifying Ford’s 2-, 3-, and 4-valve 4.6- and 5.4-liter engines. You will learn everything from block selection and crankshaft prep, to cylinder head and intake manifold modifications. He also outlines eight recommended power packages and provides you with a step-by-step buildup of a naturally aspirated 405- horsepower Cobra engine. This is the definitive guide to getting the most from your 4.6- and 5.4-liter Ford.
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Price: $22.95
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Building 4.6/5.4L Ford Horsepower on the Dyno This book takes the guesswork out of modification and parts selection by showing you the types of horsepower and torque gains expected with each modification. More than 340 photos and 185 dyno graphs show you which parts increase horsepower and torque, and which parts don't deliver on their promises. Includes complete before-and-after dyno graphs, so you can see where in the RPM range these parts make (or lose) the most horsepower and torque. Covers 2-, 3-, and 4-valve modular engines.
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Price: $22.95
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The Mustang Performance Handbook
The Mustang Performance Handbook is a comprehensive
resource to help you modify your Mustang’s 5.0-liter engine
and drivetrain for maximum performance. Hundreds of
photographs and drawings enable you to custom build you
5.0-liter engine for any performance application, from high
performance street to drag racing, road racing and
autocross. The latest bolt-on hardware from Ford motorsport
and other popular manufacturers is further described in
detain to help you select the proper combination of
components. This book is an essential guide to unleashing the power potential of your 5.0-liter engine.
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Price: $
18.95
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Payment, Shipping & Sales
Tax: Iowa
residents must pay 7% sales tax. Items usually ship within one
business day of receipt of payment! Standard shipping is a flat rate of
$4.95 to anywhere in the United States with USPS Media Mail.
Priority Mail shipping is available for an additional $2.95, or
$7.90 for shipping. Shipping is combined and discounted for multiple item
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with USPS Priority Mail International for $11.95, and to most
locations in Europe, Australia, Asia, Japan and South America for
$14.95. Satisfaction is Guaranteed. Our store has a NO HASSLE RETURN
POLICY within 7 days of purchase.
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