It seems PR motors made a gearbox for dumpers in 1955 known as the cm, constant mesh. I will have a look inside this one as the older crash boxes are described as fabricated and cast steel. My one is a cast alloy, model not on the plate! It still seems to engage and drive with the diff working fine, a test would be under load. Next to find how it originally looked, the late 90 yr old owner who gave me it cannot remember, he towed it around behind a grey fergie! Cheers the noo.

Thats great Alan, top marks I’d say. That makes sense now as it is too small to be a four wheeled dumper so its history is a drawbar being welded on after the engine died and other brackets gas axed off too.
So the plan now is to marry it to an auto gardener that is beyond repair to original and conjour up a 4wd Doe style twin engined oddity,👍😀.
I will keep you posted once every other project gets done, oh and paying jobs, 🙄. Thanks loads for your time, Andy King near Kinross.