So yes. I inspected the rear main seal via the peep hole on bell housing and cover looked clean. Rear main seal looked OK. What prompted me to do the job was the top of the bell housing was covered in oil and no way that's happening unless coming from the top. I only did the knock sensors and all those gaskets because I wasn't taking all that off and half assing the job. Valley pan gasket, grommets all got replaced. My friend and I were both shocked at how clean the engine was. No gunk or buildup on heads or area under valley pan. I've had rig for 3+ years now, so I'm not sure of previous owners maintenance.