I've used a Fatman kit in my 45 for 7 years with no problems and a whole bunch of miles, if you want to drop your 3/4 ton axle give Sid a call or visit his web site http://www.droppedaxles.com/ , I;ve got a 4" drop he did for me on my '46 flatmotored Ford PU.

'45 Ford PU
66 Valiant wagon, leaning tower of power.
79 Chevy C10 w/250
02 PT Cruiser Convertable