I see lots of worries about the 727. Mine runs stock input and output shafts, stock input hub, 3 pin planets. Though I did go to a steel front planet after stripping 2 in aprox 725 passes. It does have aluminum drums and a home modified sun shell. Stranded me 3 times in 9 years. 2 of those were me being to cheap to invest in a steel front planet. The other was an aftermarket aluminum front clutch carrier failure. Who knows how many passes it had. I traded for it used. It was easily repaired and is still in service. Not that there isnt a time and place for a TH400 or a glide. But my 727 has certainly served me well. Doesn't kill clutches or band either. So basically it has a good front drum, Super sprag (though it never hurt the stock one), steel front planet. Like I stated it has some other used aluminum stuff. Front clutch carrier and a rear drum. But neither of those do I consider stronger than stock.
Doug