Does this sound like a rod knock or bearings? I finally was able to get my exhaust leaks fixed, but I still. Have this noise which sounds like it's coming from behind the oil pan. The motor still has great oil pressure and runs great otherwise.

 

Sounds like lifters to me. Rod knock or vesting is usually deeper.

 

I'm also wondering if this could be a cracked flex plate. It's coming from that area. If it was a bearing, it just seems odd to me I wouldn't see a fluctuating oil pressure or poor oil pressure.

Is there a way to check the flex plate without pulling the transmission?

 

That would sound right being flexplate. Don't autos have a window you have to remove to remove the bolts? Or take off the starter to look in the trans. You could crank it around to look for cracks. There's a dust shield on the lower half of my NV3500 but don't know if autos have that.

 

They do, true name is "inspection cover" is there for this reason

 

There is an inspection cover, but you can only see the teeth. You can't see where it bolts to the crank which is where they usually seem to crack. I may just hope it holds together for a few months and pull my transmission once it warms up.

 

If you unbolt the torque converter, you can push it back a bit, and use a flashlight, and small mirror to inspect the flexplate....... Cumbersome, but, doable.