I have a 1998 3500 4x4 Cummins Diesel that has a front main oil seal leak. I need to know if it is a one-piece seal or a two piece seal... Is there anyone that can help me answer this question before I tear into it?

 

Can anybody help me on this?

 

Since this is a CTD issue ... I suspect you'll get a better response over in the CTD area. [&:]

 

Single piece unless your crank is grooved, then you'll want one with a wear sleeve. Either way they're a fun install