the engine was running when pulled...the motor just needs to be cleaned, some gaskets replaced and primed and started. its a fully mechanical motor...
the spacer is roughly rectangular with rounded edges...i don't remember the dimensions. i have it all written down somewhere. basically i have a 2.3l peugeot turbo diesel motor that i picked up off of craigslist for cheap from a eurocar guy in des moines when i was living there. as luck would have it, they actually came factory with a ba 10/5 which the guy happened to have. The ba 10/5's have a removeable bellhousing and the tranny side bolt pattern is identical to the jeep bellhousing. the shaft diameter, spline count and pilot bushing hole are all the same size...its just 1.25" longer on the shaft than the stock peugeot tranny. a 1.25" spacer ring would allow the jeep tranny to fit perfectly on the back of the bellhousing...thus allowing you to use the stock ba 10/5 mounting location and the stock np231 that came with that tranny. the ba 10/5 doesn't hold up well against the jeep 4.0, but the 2.3l would be the perfect companion...
they got 40mpg in the cars they came it which weren't any lighter or more aerodynamic than a jeep. i won't expect it to get close to that, but someday it will get dropped in an mj...someday