Converted my '96 Moab 3 (stock 26") to 29" (700c) capable,
i.e. can still run the 26" wheels as an option.
This was done by modding steering and brakes:
*swapping the entire steering column for rigid/threaded, and
*swapping the stock canti-brakes,
for extra-long V-brakes (125mm arms, 44mm of adjust)