I am not a tranny expert. There are several of the members around here that pulled the pan and replaced the filter. The kits that you can get from NAPA will have a gasket with the kit. In many cases, the pan filter was partially plugged and it was a very good idea to change it. After about 100 miles, you should re torque the pan bolts. They are usually very loose. I use Duralube for the transmission and it seems to be very similar to the Lucas stuff. I have seen transmissions that seemed shot recover and go many miles after it was added.