REAR MAIN SEAL FOR MULTI FUEL POWERED M35A2 AND M54A2 SERIES TRUCKS WITH THE LD-465, LDT-465, AND LDS-465 ENGINES. 

IF YOU ARE CHANGING YOUR CLUTCH, IT IS A GOOD IDEA TO CHANGE THIS ALONG WITH IT. 

# 10951177 NSN 5330009180595 , 46839, ER5248, 476801HAR