If the flange on the trans is "wavy"...it is possible that attempting to place and aftermarket flat pan would actually leak more than a "flexible" metal pan....
Place an original pan bolt thru the metal pan and measure how far the bolt sticks thru...make sure the new socket head screws are no longer than the original bolts....
There are some blind holes in the pan rail and even if the bolts are torqued to spec, if they are bottoming out before providing the crush needed to seal...it will leak...
Grab the old metal pan and check each of the bolt holes in the rail...over time the pan deflects from tightening creating small hills around each bolt hole....again, the bolt may be tightened to spec, but the raised metal area can bottom out before the gasket is sealed...(the old cork gaskets would actually split around a raised bolt hole and leak like a sieve).
Suggestion....lay the metal pan flange on the edge of a solid bench edge, and tap the area around the bolt hole down flat on all bolt holes.
Clean the surface with brake clean and allow to dry.
Grab yourself one of these gaskets and install the metal pan using original bolts....do not glue the gasket to either the pan or the trans flange.
https://www.summitracing.com/parts/l...yABEgIzzPD_BwE
Hope this helps
Image courtesy of AGCOAuto
