Longer tongue. Much easier to back up. Also, if you enlarge the middle photo you will see 'stroke reducing collars' on the cylinder shaft to limit the return stroke. The original valve was replaced with a detent, a third engine because the second one became hard starting. Although, once started it still ran well. The cylinder is original. It does need to be level side to side because the box axle tube is the hydraulic resevour (spelling?) and oil will come out the breather. Hated to sell it after so long. Replaced it after getting a SuperSplit and TW-6 with log lift for the big stuff or I'd still be using it. K car or mini van rear axles are cheap at the junk yard to jack it up. Mine had split shackles or straps bolted around the box tube and axle. Not pretty but worked. It had been raised up to pull behind a tractor in an orchard before I got it.