Unknown transmission

From some research it seems it may be a 727 with lockup converter that came in 95 B2500 vans. I went out to the driveway and looked to verify that it is a 95 engine. Looks just like a 727 because it has no overdrive. The designation from the research is a 36RH. I looked at the numbers on the side rail and could only come up with PK5211917.... couldn't distinguish the other numbers.