ATS Diesel Performance Valve Body Assembly- Allison LCT1000.The control center of a transmission is the valve body. It controls transmission operation, torque converter control, shift feel and ultimately, transmission reliability. ATS used a pro-active approach to re-engineer Allison valve bodies and trim valves from the ground up. ATS Engineering has developed a valve body assembly That result is a comfortable, yet confidence-inspiring shift and increased holding capacity. ATS valve bodies come with a 5 year / 500,000 mile warranty. Valve Body has Performance "A" Trim and "B" Trim Valves.