Working on my sons 06 LBZ. It has a coolant leak where the oil cooler elbow meets the block. He took it apart and somehow got the whol assembly out but now we can’t get it back in. The elbow on the back of the oil cooler hits what I believe is called the midplate before the holes line up on the block for the two o ringed oil passages. I don’t see how this happended as it was in there but I have tried everything. If I take the elbow off , the oil cooler goes right in. It almost seems as if I have to grind out the midplate to give it clearance but it came apart. We have been trying for 4 hours and cant get it back in, we tried leaving the bolts loose on the elbow. It almost seems to me like the transmission will have to come out and that midplate be loosened then the oil cooler installed while thats loose ?.