Originally posted by Gazim:
You can usually find one cheaper in a salvage yard.
If you can find a torque tube style 3rd member in a salvage yard with 3.55:1 gearing, let me know where. Otherwise, you'l not only need the complete rear end, but also a transmission and a custom fit driveshaft. Plus, you'll have to do a little modification to your spring mounts and probably the shock mounts. I don't think you'll save much doing that, although you will have a lot more choices for transmissions and rear end ratios.