if its a 3.09 its not a transit/P100 axle, the closes you get to that in a transit/P100 alxe would be a 4.56, when i was building my 24v P100 i used a Ford Explorer axle, they are 3.73 and all you do is move the spring pearches to suit the P100, once the pearches were moved it went straight on, with a bit of modding the handbrake cable fitted the disc brakes as well, you have to use the explorer wheels or anything 5 stud Jap should fit the axle, i fitted granada cosworth wheels but the stud pattern is 2mm out so not ideal, explorer axles are american 8.8 and have LSD and discs as standard, the they fit capris as well with no modifing other than the floor for the prop!!!!!