Hello everyone, I’m looking for a old leaking Heat Exchanger (Transmission Gear Oil to Coolant), Part Number 180846. My plans are to design and evaluate the costs to fabricate replacements at a cheaper price than the factory units. I need the old unit to reverse engineer. I also don’t know what the exact failures are. I’ll look at both stainless steel and aluminum. Those that don’t drive there car hard may benefit from a less complex version with fewer internal tubes.