I have a 46 on my 4100. It's a subframe hoe so it takes more time and effort to install/remove than the 47 or 48. I got the 46 because I already had the 4100 and did not want to upgrade the tractor at this point so it was my only option. If you're looking to upgrade your tractor and get a BH go for something bigger like a JD4310 with a 47 or Kubota 2910. I have the standard 9 inch bucket, it digs fine but can push the tractor around quite a bit. The entire 3 point hitch and all MMM quicktach hardware has to be removed when the BH is attached. Steve