Welcome to the forum and thanks for your question.
Product support handles these but they don't routinely monitor the shop management software forum, so I try it before sending it to them.
Are you looking at Estimator off DVD or hard drive? I'm seeing V6 4x4 times in ondemand5.com for all Liberty models right now:
Tim McDonnell -
National Training Mgr / Forum Moderator / Mitchell 1 Training Media Developer