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Ahhh, the MT-82. There is a lot to be said about it, some good and some bad, but if you are reading this it is probably bad.
Everyone knows MT-82 life can be difficult. Sometimes it is luck of the draw, sometimes it is the street and the strip doing what they do. Either way there is a fix: a Calimer Transmissions built MT-82.
Ben Calimer has built a serious reputation supplying some of the fastest 6-speed cars in the country. Whether your MT-82 has already let go or you are getting out in front of it, there are four stages to choose from. This page covers what each one gets you and the practical details people call us about.
The MT-82 Problem
Two things fail on these boxes: the shift mechanism and, at higher power, the gears themselves. Ford used plastic pieces in the shift rail assembly and the factory shift pads wear. That is where the vague, sloppy, missed-gear feeling comes from long before anything actually breaks.
Every Calimer stage addresses the shift mechanism first, with bronze shift pads and a billet shift rail stop replacing the factory plastic. That is the baseline. What separates the stages above that is how much strength gets added, and whether the gearset itself gets replaced.
All Four Stages Compared
| Stage 1 | Stage 2 | Stage 3 | Stage 4 | |
|---|---|---|---|---|
| Bronze shift pads | Yes | Yes | Yes | Yes |
| Billet shift rail stop | Yes | Yes | Yes | Yes |
| New synchros & seals | Yes | Yes | Yes | Yes |
| REM polishing | - | Yes | Yes | Micro-polishing |
| Cryo treatment | - | Yes | Yes | - |
| Billet G-Force gearset | - | - | Yes | Yes |
| 26-spline input shaft | - | - | Yes | Yes |
| HD billet main shaft | - | - | - | Yes |
| Carbon fiber synchronizers | - | - | - | Yes |
| Painted case | - | - | - | Yes |
| Oil included | - | - | - | Yes |
| Core required | No | No | No | No |
What Each Stage Adds
Stage 1
The shift mechanism fix plus a fresh rebuild. Bronze shift pads, billet shift rail stop replacing the factory plastic pieces, and new synchros and seals. If your box shifts badly but has not failed, this is the honest starting point.
Stage 2
Everything in Stage 1, plus REM polishing and cryo treatment. Both are surface and material treatments: polishing reduces friction between the gear faces, cryo improves the metal's durability. You are not adding parts, you are making the existing ones last longer under load.
Stage 3
This is where it stops being a rebuild. Stage 3 adds a billet gearset produced by G-Force specifically for Calimer Transmissions, on top of everything in Stage 2.
Stage 4
Calimer's most comprehensive package. Billet gearset and 26-spline input shaft as in Stage 3, plus an HD billet main shaft, new carbon fiber synchronizers, and micro-polishing of internal parts to reduce friction, increase longevity and improve gear engagement. New seals and bearings throughout, professional reassembly, a painted case, and the recommended oil included.
This is the serious high-horsepower and competition answer. If you are building a car that will see repeated hard launches at real power, this is the one.
Billet shift rail stop
New synchros and seals
No core required
REM polishing
Cryo treatment
No core required
Rated to 1000 hp / 900 tq
26-spline input shaft
Requires a 26-spline clutch
Carbon fiber synchronizers
Micro-polished internals
Painted case, oil included
Before You Order
Three things catch people out. None of them are difficult, all of them are annoying to discover after the transmission arrives.
Getting a 26-spline clutch sorted at the same time? Our McLeod clutch comparison covers which line suits your power level, and the break-in guide covers what to do once it is in.
Frequently Asked Questions
Why do MT-82 transmissions fail?
Two separate issues. The shift mechanism uses factory plastic pieces and shift pads that wear, which causes vague shifts and missed gears. Then at higher power the gearset itself becomes the limit. Every Calimer stage fixes the first problem; Stage 3 and 4 replace the gearset to fix the second.
Do I need to send in my old transmission as a core?
No. There is no core required on any stage, so you are not waiting on a core exchange with the car down.
Which Calimer stage do I need?
Stage 1 if it shifts poorly but has not failed. Stage 2 if you want the same rebuild with REM polishing and cryo treatment for durability. Stage 3 if you are at real power and need the billet gearset. Stage 4 for high-horsepower and competition use.
How much power will a Stage 3 MT-82 handle?
It is rated to 1000 hp and 900 tq. Calimer's position is that no other Stage 3 MT-82 matches that capability.
What clutch do I need for a Stage 3 or Stage 4?
A 26-spline clutch, because both use a 26-spline input shaft. Use the same clutch as a 2007-2009 Shelby GT500. A 23-spline clutch will not fit.
Will a Calimer MT-82 fit my 2015 or newer Mustang?
Yes, but the transmission ships with a 2011-2014 tailshaft. On a 2015+ car you use your own 2015+ tailshaft.
Does the transmission come filled with fluid?
No, it ships dry. Calimer prefers 2 quarts of Amsoil Synchromesh plus 0.75 quart of Amsoil 75-90 Transaxle Fluid. Ford's factory recommended fluids are also acceptable.
What is REM polishing and cryo treatment?
REM polishing smooths the gear surfaces to reduce friction between them. Cryo treatment is a cold process that improves the metal's durability. Neither adds parts; both make the existing components survive more load.
Is there a Calimer option for a 2018 or newer Mustang?
Yes. Those cars use the MT-82D4, and Calimer builds that separately, covering 2018+ S550 and 2024+ S650 Mustang GT.
Can I use a Calimer MT-82 in a swap or non-Mustang project?
People do. The source of these boxes is the Mustang, but we do not discriminate about where it ends up. Call us and describe the project.
Keep Reading
Questions on which stage fits your build? Email support@lethalperformance.com or call 877-2-LETHAL.
Stop Replacing the Same Transmission
Four stages, no core required, and a builder whose boxes are under some of the fastest 6-speed cars in the country.
