Fins, air dam, all good. I'd take anything to help. Luckily the 2008 Sable AWD (parts car 115,000 mi) PTU I pulled to swap into my 08 Taurus X AWD the gear oil was still fluid with very little evidence of cooked oil. I opened it up and cleaned and decreased it, inspected the internals. Looked pretty good! I replaced the 2 D.S. input shaft case seals and PTU-to-trans gasket seal, I also replaced the P.S. input shaft internal oil seal, case seal, and seal deflector. One of these days I'll post pics, I took a bunch and have a list somewhere of the original replaceable parts numbers (i.e., bearings). I also added a drain plug and removed the vent valve tapped for a barb fitting to fab up my own vent extension (rather than Fords $50+ part).
Keep in mind I was doing this as preventative maintenance while I had the engine and tranny out for other work.
HTH, Bill.
p.s. Something noisey in the bank 1 firewall cyl head argh and trans won't shift right so darn car still sitting.