Based on our Transmission Fluid Change Kits developed over 10 years ago, the BG Combo Kit includes our world famous MT82 Syncro Shift II Kit with your choice of BG Ultra-Guard Differential Fluid which allows you to perform a complete driveline service with 1 kit for your S550 or S650 Mustang that did not come equipped with Transmission and Differential Oil Coolers.

We recommend the 75W-90LS for all street driven Mustangs.

BG Ultra-Guard® LS Full Synthetic Gear Lubricant is a universal, full synthetic API GL-5 rated gear lubricant blended to SAE 75W-90 viscosity. It provides the ultimate protection for driveline components, especially those requiring limited-slip function. It is formulated for increased thermal stability, improved seal performance, quieter operation, and unsurpassed protection against wear, pitting, and corrosion.

BG Syncro Shift® II is 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 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. 
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. 
 We include 1 - 96oz (2.8 liters) Container of Syncroshift II, 6oz of MGC Additive, a high volume fluid pump, 2 Quarts (64oz) of Ultra-Guard, a pump, dipstick, teflon sealant tape and Color Instructions.