The bubble cab looked ridiculous on a 3600 too. It was pretty oversized on a 4600. I too am amazed Ford thought they needed a 4100. Only ever seen them with the old style super deluxe cabs off the preceding 1000 series or some sort of other make of cab (duncan?). I think our 4600 would have been improved for the fitment of 13.6r 36s instead of the 12.4s. Game tractor but didn't sound nice. IH 885XL that replaced in a different league.I agree. I never saw the point of the 4100. You want small there was the 3600 and medium was the 4600. I’ve done many hours on both and I reckon the 4600 was as small as you want to go and as a tractor it was superb at a lot of things. Great torque. Baled for years with its predecessor 4000 which I really liked.