When we developed our Transmission Fluid Change Kits over 10 years ago, the MT82 Transmission Fluid Kit was the first kit released. We have offered the GT350 Kit for almost as long.
Improves the shift performance of the Tremec 3160 6 speed manual transmission used in the Ford Mustang GT350, Mach 1, Dark Horse, Dark Horse R from 2015 to Present. The OEM Automatic Transmission Fluid (ATF) Fill does not stand up to the heat and loads generated when these vehicles are driven hard in a Road Course environment. 

Automatic transmission fluids (ATFs) and other light lubricants are often recommended for use in transfer case, manual transmission, and transaxle applications. Due to their light viscosity and low film strength these fluids do not fully protect all components. Manual transmissions and transaxles in particular, induce severe fluid shearing,
greatly sacrificing wear protection. 

BG Syncro Shift® II provides exceptional thermal stability along with outstanding extreme pressure characteristics. The special additive chemistry contained in BG Syncro Shift® II does not sacrifice any performance characteristics as does ATF or other low viscosity fluids.

BG Syncro Shift® II was the foundational chemistry we rely upon. We have shipped thousands of quarts of this product to every corner of the world.
BG Syncro Shift® II Full Synthetic Gear Lubricant is specially formulated for manual transmissions, transaxles, transfer cases, and Haldex units. It is a full synthetic API GL-4 gear lubricant that provides unmatched film strength and wear protection. It provides exceptional resistance to mechanical shearing, has excellent low-temperature fluidity, and is safe for all steel, brass, and copper alloys. 
BG Syncro Shift® II is an API GL-4 gear lubricant blended to SAE 75W-75 viscosity and may be effectively used in all vehicles where engine oil, ATF, or GL-4 gear oil is specified as “service fill” for manual transmissions. 

Compatible and suitable for use where the following are specified:

• Ford XT-11-QDC (Spec. WSS-M2C200-D2)    

• GM Auto Trak I and II

• GM Versa Trak  

• GM Synchromesh  

• GM PN 12345349 (specification 9985648)     

• GM Transfer Case Fluid PN 88861950        

• Mopar PN 04874464, PN 05016796AB, PN 05016796AC, PN 05170055AB, PN 05179014AA, PN 68001758AA, PN 68089195AA, PN 68092630AA  

• Motorcraft XL-12  

We include 4 - 32oz (quarts) of Syncro Shift II, 6oz of MGC Additive, a fluid pump, and Color Instructions.