Change 'href' attribute in AJAX enabled links
Drupal link based Ajax, correspond to a Drupal.ajax['#id'] element object and drupal works with them not with DOM Objects.

So you don't have to change the href attribute you need to change the URL where it's doing POST in the Drupal.ajax element, in this case do this:

// Confirm structure first executing on console 'Drupal.ajax['#id'].options.url'
var href = 'hook_url/ajax/parameter1/parameter2';

// And change the href POST parameter
Drupal.ajax['#id'].options.url = href;


And it's done!