Cheap Engine/trans dolly

That turned out great! If you want to strengthen it up a tad, cut a 2x4 so it fits from the 2x8 that the engine sits on, down to the leg at the casters. Cut it on a 45 at each end, and nail it up. You made a good move by snagging all of those casters!
Thanks! I wasn't sure if the 2x2's would be stout enough, but it seems fine. I had to do a pitstop on it today though, one of the casters lost a huge chunk of rubber. Jacked it up with the floor jack, swapped it out, all good. I'm willing to bet these casters are 50+ years old. My mother and father-in-law stopped by yesterday and saw this setup, and both got smiles when they saw I was using Bill's old stuff :)