I'm wondering if anyone here has looked into swapping a 4 cylinder (5.2 liter) diesel engine and transmission from an Isuzu NPR into a big bolt? Apparently, these come with double overdrive 6 speed automatic transmissions. A little searching around on the internet shows that NPR's have rear end ratios as low as 5.85, so it seems these might be ideal match for AD trucks with their 6.17 rear gears.
