Thanks for the link hd3, really helpful. I guess the motivation would be to reduce strain on the drive components and only engage 4wd when really necessary, realistically once the front wheels have slipped. So surely if you've lost traction already it's not that bad having to be stationary to...

Right, I'm new to this, had a look but I couldn't find any posts/threads for this so here goes. I'm thinking about making a manual VCU conversion, as a bolt in unit to replace the original, so I could run front wheel drive with the back wheels/shaft assembly from the vcu back freewheeling when...