With the front adapter elevated, the cryo- and REM-treated input shaft with its press
American Powertrain’s cryogenic treatment consists of slowly reducing the temperature of the parts to -300 degrees F using liquid nitrogen, and then holding that temperature for 12 hours. This process relieves stresses and minute fissures in the part by refining the structure of the metal, resulting in a more uniform material. Strength and wear resistance are improved.
The rate at which the temperature of the part returns to normal also contributes to its attributes. According to American Powertrain, the quicker the part is returned to normal temperature after the process is completed, the better.
 After Greg taps the bearing onto the front of the mainshaft using a properly sized tr
REM treatment follows cryo and is a process that fills the minute imperfections that occur naturally in the gear’s surface. By filling and polishing these minuscule valleys and inconsistencies, fluid pressure requirement and friction are reduced across the gear face, and durability and corrosion resistance are enhanced. According to Gray, this translates into reduced temperatures, noise, and parasitic loss—which is good.
With the package chosen, we disassembled our broken transmission and sent the parts to American Powertrain to have them treated and put back together with parts included in the Level 2 package. Greg Lovell at Anti Venom handled the disassembly and reassembly.
 The shift rails were installed next. These will house the shift forks that we sent ou
While Anti Venom is mostly known for its high-end builds and performance installs, Greg has been rebuilding transmissions since he was a teenager and most of those high-horse cars that roll off out of his garage feature a trans he rebuilt. Even with the great “how-to’s” out there, it’s always best to seek out professional expertise when dealing with an expensive manual transmission.
Please keep in mind that this is not a step-by-step trans teardown and rebuild story, as space would simply not allow it. Instead, we cover most of the highlights of the process and discuss the upgrades.
 Greg slides on the new bronze fork pads. From the factory, these pads are made of a n
 This is what 80,000 miles of performance driving can do to the stock fork pads. These
 Here we see what the transmission looks like after installing the mainshaft, counters
The Transmission Package
Level 2 M12 T56 transmission
495 lb-ft constant-load torque rating
The Level 2 kit includes:
Bronze fork pads for 1st, 2nd, 3rd, 4th, 5th, 6th, and Reverse
Billet synchronizer keys and spring kit for 3rd/4th synchronizer assembly
Cryo treatment of 1st-4th gears, shift forks, and sliders
Call tag to pickup parts from customer (within continental U.S.) to have cryo-treatment performed
The following parts will need to be removed and boxed for American Powertrain to Call Tag for this upgrade:
1st/2nd/3rd/4th gears and their input shaft
Countershaft (lower gear in gearbox, also known as cluster)
Sliders, not hubs, for 1st-2nd and 3rd-4th
Shift forks (no rails) for 1st-2nd and 3rd-4th
 Next, Greg lines up the parts for the Fifth/Sixth driven gear and Reverse gear to be
 This closeup of the shift-fork rail assembly gives you an idea of its complexity, whi
 Greg slowly lowers the case onto the front adapter. This can be tricky, as the parts
 Finally, the Fifth/Sixth gear driven is lowered onto the main shaft with Sixth gear a
 Carefully, the transmission extension housing is lowered into place and guided in wit
 Here’s the completed trans, ready for reinstallation. The process of removing the tra
 As per Gray’s suggestion, instead of tracking down another expensive OEM bellhousing,
 This is the ACT Street Disc (PN GM9-HDSS)—an entry-level clutch, which offers a holdi
 We combined the clutch kit with the SFI-approved Prolite Xact Flywheel (PN 600585; $3