I'm about halfway through an engine swap on my 96 Blazer 4x4. I'm gathering all the gaskets and what not that I'll need when I put it all back together.

When I pulled the front driveshaft off the transfer case, there was a very worn out, basically in pieces, white soft rubber type ring/seal around the output shaft on the t-case. It just fell out in pieces.

I can't figure out what I need to buy. Its not the type of fluid seal that presses into the t-case. It was just loose around the front output shaft.

Any ideas what this is? I've been searching around sites like Rock Auto and can't figure it out.

Thanks!