I am planning to remove my rotoflex drive shaft and replace it with a drive shaft out of a 91 range rover that I got. I cant get the rear flange off of the range rovers diff. and i was wonderingwhat the flange is calledsothat i could getone online. I have a 1996 disco 1. What is that4 bolt flange called that will fit my disco?

 

You have it right "Four bolt flange" for the rear driveshaft.

You will need to pull the center line up "plug"for the rotoflex to get to the bolt that holds the 3 bolt flange on.
If you look you can see that the plug has threads in the center thats how you pull it out when I started to do the replacement I started to build a tool to do it but it was easier to have a Land Rover Shop do it, I payed $125 U.S.D.

 

Why replace the rotoflex, especially with a more light duty drive shaft from a RR?
Not a good direction to go.