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Ford Performance TREMEC T56 6-Speed Transmission; 2.66 1st Gear

Item 50429
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Genuine Ford Performance Part
      • Magnum T56 Transmission
      • Gear Ratios: 1st 2.66; 2nd 1.78; 3rd 1.30; 4th 1.00; 5th 0.80; 6th 0.63
      • Torque Capacity - 700 lbs/Ft
      • Input Shaft - 26 Spline
      • Output Shaft - 31 Spline
      • Additional Parts Needed for Installation
      • Fits 1999-2004 Mustangs


      Tremec Magnum. Is your high performance Mustang making more power than your factory manual transmission can handle? Then you need to upgrade to the Ford PerformanceTremec Magnum T56 6-Speed Manual Transmission. This Tremec T56 is the perfect replacement for your old TR-3650 and has a torque capacity of 700 lbs./ft. making it ideal for high-performance applications such as a 5.0L Coyote engine swap.

      Built Ford Tough. The Ford PerformanceTremec Magnum T56 Transmission is equipped with a 26 spline input shaft and a 31 spline output shaft and features provisions for mechanical and electronic speedometers. This Tremec Magnum T56 Transmission is capable of handling up to 700 lb-ft of torque.

      Gear Ratios. 1st 2.66; 2nd 1.78; 3rd 1.30; 4th 1.00; 5th 0.80; 6th 0.63

      Application. The Ford Performance Tremec Magnum T56 6-Speed Manual Transmission is designed for use in the 1999 to 2004 Mustangs equipped with a small block Ford 4.6L SOHC/DOHC or 5.0L Ti-VCT V8 engine.

      Installation Notes. This Tremec T56 transmission may require a shorter driveshaft, a modified crossmember/trans mount and other minor modifications for proper installation. For SBF 302/351 Windsor engines use Quicktime bellhousing (part# 8031), for 4.6L/5.0L/5.4L modular engines use Quicktime bellhousing (part# 8080).

      NOTE: Ships Continental 48 States ONLY. No Canada, APO/FPO, Hawaii, Alaska, Puerto Rico, Guam or Us Virgin Islands.

      If shipping to a business, please include the business name. Also, after your order is placed, be prepared to let us know if you will need a Lift-Gate service. You will be contacted via email before your order ships.

      Fitment: 1999 2000 2001 2002 2003 2004 Details

      Ford Performance M-7003-M6266

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (6)

      Write a Review

      Ratings Summary

      3.0 out of 5 overall rating from 6 customers

      Installation Time: Full Day

      • July 05, 2017

        1 2004 GT - Corey

        Be Aware

        At first, I wasn't concerned about the big lettering that says "MADE IN MEXICO" on the box. But now it's regretful. My personal T56 Magnum has a horrible internal noise at low RPM, higher load (1500-2000rpm, half throttle and higher). Almost a metal on metal growling noise or bad bearings, then goes away. It also does not like to shift into 2nd gear above 3500rpm without grinding horrendously. All clutch/flywheel parts were checked and measured before install, so it is not that. Fluid was changed and it was as metallic as a pearl paint job on a lowrider G-body. Not saying this is for all the Magnums they sell, but this is my experience so far with 800 miles on it. Looks like a call to Tremec is on the schedule as from other reviews, AM directs you to Ford Racing.

        Helpful (40)
      • January 01, 2017

        1 1986 Other - Slayton67 Installation Time: Full Day

        Poor quality

        I have put 4000 miles on my transmission and it has already broken causing me to get the car towed home over 200 miles. It has had a rattling sound since about 2000 miles Ford Performance Parts DOES NOT offer a warranty. Now im out a transmission, $3,050, a hefty tow bill, and my only vehicle i would not buy again.

        Helpful (28)
      • August 08, 2016

        1 2003 Cobra - Tracy

        Tremec Transmission

        They don't tell you that there is no warranty, after about 300 miles started seeing leaks on the ground, called American Mucsle, refeered me to Ford Racing, no warranty because it's consider racing equipment

        Helpful (28)
      • March 03, 2016

        5 2003 Mach 1 - 04DSG Installation Time: Full Day

        Shifts like butter

        I would recommend this trans to anyone, it shifts very smooth. Gear shifts are crisp and effortless. I have about 1000 miles on mine with no complaints. It comes with a shifter base but you will need a handle for it. It does require an 03/04 cobra bellhousing, crossmember, and shortened driveshaft, or aftermarket equivalents of those. For the price I feel like you cannot beat the bang for your buck with this trans.

        Helpful (24)
      • February 02, 2016

        5 2003 Mach 1 - 04DSG Installation Time: Afternoon

        T56 Magnum for new edge mustangs

        I have not gotten to drive the car with the magnum installed yet, but I have completed installation. There are some modifications needed to make this swap happen in a new edge. Anyone not already running a Cobra T56 will need a stock Cobra bell housing, crossmember, clutch fork, possibly even clutch cable setup would be best. In addition, the crossmember holes will need to be slotted 1/4" or so since the T56 magnum sits differently in the car. Your driveshaft will need to be shortened (measure for this once installed) roughly 1", maybe more, and a 31 spline yoke is required, stock cobra is a 27 spline piece. Anyone planning on running a twin disc clutch will need an adjustable pivot ball, and modifications to the clutch fork will be required for clearance. The Magnum already has a couple slots machined in the face of it for the clutch fork to sit in, but it is still not enough room for a twin disc. I know this sounds like a ton of work but it's really not bad. I am told the swap is completely worth it! I will update after I have completed trans break in mileage with driveability etc.

        Helpful (21)
      • July 21, 2013

        5 2003 Cobra - cman Installation Time: Full Day

        Love Tremec transmissions

        This is a great transmission. I love the way this thing shifts and its super easy to drive. I have not had a 6 speed before and was a little concerned about getting into 5th but after driving I have no worries. If you buy one of these make sure you can source a clutch fork if going on a cobra.

        Helpful (25)

      Questions & Answers (18 answers)

      5 Top Rated Questions

      Will this fit my stock bellhousing on my mustang V6 2000?

      • The Ford Performance TREMEC T56 6-Speed Transmission is for use with 999-2004 Mustangs equipped with a small block Ford 4.6L SOHC/DOHC or 5.0L Ti-VCT V8 engine. Unfortunately, this transmission will not work with your vehicle if you have the 3.8L V6 motor.

      Helpful (5)

      Would this work w a 2003 mustang v6?

      • This can be used with all Mustang models, however it is not a direct bolt on application.

      Helpful (1)

      I have a stock 02 GT and my tr3650 is toast so I wanted to upgrade. My question is will the stock engine be able to handle these steep gears and what will I need to do the swap? If not what would be a good transmission to swap (preferably 6 speed)? Also will I need to change to 4:10 rear end ratio or not? Hopefully in a couple of years there will be a 5.0 coyote and I don't want to have to buy a stronger transmission so I want to set myself up good for the future but the 5.0 is only a dream right now due to school and the lack of knowledge/money. Thank You!

      • The Ford Performance TREMEC T56 6-Speed Transmission - 2.66 1st Gear will work in your 2002 GT. The shift points are going to be completely different because you are going to putting in a 6-speed transmission. You will need to order a Quiktime bellhousing, a custom driveshaft (which will need to be shorter than stock), and a 26-spline clutch with a new flywheel to match. You will not need to change your rear gear ratio, but if you prefer to do so, I strongly suggest going with a 3.73 gear as the 4.10 gear is good if you are going to race your Mustang.

      Helpful (1)

      Given the difference in Input shaft and output shaft splines, is this a direct replacement for the T56 in my 2003 Cobra? Same bellhousing, shifter, speedo connections etc?

      • Not a direct 1:1 swap. (few parts will make it a faster swap) Shifter is different that the normal 4 bolt on the factory T56. (6 bolt you see in the picture is in the correct location) You will need to change to a 26 Spline clutch. You will need a shortened drive shaft due to the longer tail shaft. Speedo/other connections still work with no extensions. You will need to re-use your factory K-Member . I bought a aftermarket steel bellhousing instead of re-using the factory as it makes the top bolts easier to access. I also had to slightly reform my trans tunnel. Did this swap on a 2003 Cobra.

      Helpful (1)

      Looking to put in a 94 cobra with fully built stroked to 318 c.i. engine with a procharger. What gear ratio would be best if driving on street and highway?

      Post Your Question
      10 More Questions
      I have a 2004 mach 1 automatic, wanting to swap over to manual, is this direct bolt on or what will i need? 1 answer
      will this fit a 383 stroker? 0 answer
      I have a 99gt with a cobra rearend what i need.I have a 98teskid engine with 800h.p. or more. 1 answer
      I have a 03 GT Could i just use a cobra driveshaft instead of having mine custom made to fit this 1 answer
      (99-04) GT. Will this transmission be a direct fit, or will I have to make any adjustments to make it to fit? 1 answer
      How hard is it to swap this to a 96 gt? 1 answer
      does anyone know what specific vehicle this transmission comes in stock? i am trying to do some research to find out how stout this transmision is. Do to mixed reveiws on AMs website. thank you for any replies 1 answer
      I have read that dealers can swap overdrive sets between 2.66 and 2.97 transmissions. Is this still true, and does American Muscle provide this modification? I'm looking for a 2.97 first gear with the .80/.63 overdrive set.. Thanks. 1 answer
      Im building a v6 mustang with a lot more then 400 hp, and i dont know if the current tranny will hold up. Will this tranny fit with slight mods or do i have to get a custom build? The stang will have 520HP when finish as a v6 with some of the part i built myself and need a strong manual tranny. 1 answer
      would this work well with my mach 1 2003 it just has exhuast andother bolt ons and does it come with a performance clutch? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Transmission

      Tech Specs

      Will It Fit My Mustang

      • Bullitt - 01
      • Cobra - 99, 01, 03, 04
      • Cobra R - 00
      • GT - 99, 00, 01, 02, 03, 04
      • Mach 1 - 03, 04
      • V6 - 99, 00, 01, 02, 03, 04

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