Change the fluid but don't touch the filter. You may want to do it twice to get the burned fluid out of the converter. Like I said before, don't remove the filter. When a trans gets old its used to a certain amount of flow and if all the sudden its starts seeing more pressures it often will blow seals and die a quick sudden death. You need the lubricity so freshen the fluid. I would stay away from the RP if it were me.