Having only a 2wd Granvia, I'm not familiar with what would be the effect on the transfer-gearbox of disconnecting the drive to the front axle (or removing the remaining front half-shaft). There must be plenty of advice available on converting a 4wd Toyota to 2wd....
If it is just the U/J that is broken it is not too difficult to fit another but you will need to watch a video on utube to see how it is done if you have never done one before, but you will need a vice, hammer, sockets, grease and internal circlip pliers to carry out the job, and the U/J of course.
Try this link to help look up your parts, just put in your chassis number where it asks for frame number.
The front axle is always driven and the rear axle is driven via a viscous coupler, which has to 'warm up' before acting.
This makes the two 4x4 Granvias that I have basically mostly front wheel drive, this may be due to age of the vehicle though, both mine are over 100k miles.
I took the front prop shaft off to see if it would drive and I had to floor the van in drive before the viscous coupler would engage, I managed to 'lock' it up for a couple of days before it released and you sit somewhere revving until it locks again with the required heat.
I have converted both my vans to rear wheel drive due to front 'axle' spline wear noise, by welding the viscous couplings and removing all the components forward of the transfer box.
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