Is torque converter failure common even after F37?

Not common but it does happen if one can go by how many have been replaced by the dealers. They like to throw parts at most problems rather than do the diagnostics.

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Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.