d30 disco swap

What does it take to switch a non disco d30 in.I got one don't see a difrence in the other then the vacum system.

It will go right in but you'll need to rewire and install the non-disco switch in place of the vacuum switch on the t-case so the 4wd light works if you care about it. The disco uses a vacuum switch on the passengerside firewall to turn on the 4wd light as opposed to the non-disco switch on the t-case.