Normally you push and the purchaser then pulls!
(i.e you initiate the push and the purchaser is given instructions by Godaddy.com how to complete the change of ownership).
You will need the new owner's registration details to do this.
The process is more "formal" than, say, an Open SRS push, and as far as I can see, doesn't involve the slight risk of someone else putting in a transfer request at the same time as the legitimate purchase (discussed elsewhere on another thread).
The new owner won't be able to change owner or registrar for a 60 day "lock down" period, which is a (probably sensible) safety measure.