I believe these transmissions are built by the Company ZF they make alot of trannys for alot of vehicle manufacturers now. This transmission and the 6 speed in the 3.3 seem to be no dip stick. Meaning it is filled from under the vehicle. The trans filter is built into the trans pan, so when trans gets serviced the pan gets thrown away and a new pan is installed. The trans pan is not on most models made of stamped steel. it is made of a durable nylon plastic type..