After speaking with Don this morning it seems that my 635 CSI Euro differential has the snappy oil cooler but it is not an LSD. It's a 3.07 open diff which means it's not what I want to put into the blue coupe. I am going to save the cooler because it looks like it will fit into any one of our differentials and if I'm lucky enough to find the one I wish for the cooler will give it a little extra "bling". Oh, BTW, anyone want to buy an open 3.07 diff really cheap? 
Sorry, wrong place to post, but the lesson I continue to learn is that I know very little about interchangeability. I'm pretty sure the engine and trans will be an upgrade from what I have as my engine is tired and my trans is quite noisy in gears 1,2 & 3.
Sorry, wrong place to post, but the lesson I continue to learn is that I know very little about interchangeability. I'm pretty sure the engine and trans will be an upgrade from what I have as my engine is tired and my trans is quite noisy in gears 1,2 & 3.