Its been a while since this thread peterred out. Having just read all 17 pages it appears the only ways are...
1) Remove both parts of prop shaft including VCU.
2) Remove only 1 part of propshaft - seams easier to remove the whole thing to me, and if the VCU was working, this would trash it as it would have permantent drive to 1 side only (ie constantly locked up).
3) Remove both parts of prop shaft including VCU, and the rear pinion from the IRD and replace with a blanking plate - may overcome some problems with IRD.
4) Fit a 2WD replacement IRD with rear pinion disabled.
How to companies modify the IRD to make it 2WD while retaining the pinion? I presume a gear is taken out.
Some pretty good ideas for enhancing the 2/4WD capabilities in the thread? Did anyone get any more info?
Personally, I think you were all looking at the complicated solutions. I bought one of those pump jobbies that suck in oil and pump it out - to fill my IRD. So I'm thinking I could mount this in the center console and run a pipe from it to the VCU - when I want 2WD - I simply suck all the viscous fluid out of the VCU and then pump it back in again for 4WD.
However, the PTO option had my attention - could finaly find a use for this on my SIII....