Abstract: A sun roof assembly for an opening in a vehicle roof in which a sun roof panel mounted on a pair of mounting arms is moved between closed and vented positions by an improved stable lifting mechanism which includes two pairs of cooperating lift members each a sliding member mounted in stable sliding relation on an associated track for rearward and forward movements with respect thereto between closed, vented and open positions and a pivoting member pivotally connected to an intermediate portion of the associated mounting arm. Each cooperating pair of lift members have spaced first and second sliding connections therebetween constructed and arranged so that when the sliding member is moved between the closed and vented positions thereof the associated pivoting member is stably moved to pivot the associated mounting arm about the pivotal axis of the associated forward slide member between the closed and vented positions of the associated mounting arm.