R151 turbo transmission bell housing rubber plug

This is what should be covering the gaping hole on your 5 speed (or automatic) bell housing. It's only used on the turbo trucks. The purpose of the hole in the bottom of the bell housing? It's a secret........ actually, I don't know for sure. 

Keep dirt and water away from your clutch assembly. Install it if you don't have one. 

Fits 1986-1988 turbo trucks only.