The diesel I am planing if I do not use the 4.0 came out of a 240D, but will add a turbo to it, to bring up the HP to the org 2.3 power, but will have a tad more torque , early 2.3 turbo T5 because of almost 4 to 1 first gear , the turbo and manifolds will come off the 300 SD with mods to the intake and exhaust manifolds to fit the 240D engine, but the weight is just about the same as a 2.8 V-6, simple motor mount will make it a bolt in and they run forever , if I go that way, just that I have a spare engine for my old rusty but trusty 240D, but still over in the other corner sits a 4.0 , I bolted it in the car a few years ago to see how things would line up, just about the same as the 2.8 I took out of it , it fits the C-3 the mounts fit like they belong , only I had the remove the oil pan to do it (pump pick up in back) the 2.8 oil pan will fit with mods to one side of the pan , one inch wider on one side only , the other side all the bolt holes line up and will take the same 2.8 gasket , the only problem I see is the tall intake, might weight a few lbs more but it is the same engine family as the 2.8, but if I do I will have to find another A4LD to put it on the back of the 4.0 because it went into my 76 2.8 pinto, hope this helps you , later Blaine