I think Paul Lamar evaluated that and a few other transfer type case arrangements on his website. Not sure where it all went, but someone was trying to adapt one.
I think his son is getting his website back up running now.
MW
From: Rotary motors in aircraft
Sent: Sunday, July 05, 2020 2:20 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] PSRU
What do you guys think ? Could this part ,of a Dodge Rambler V8 Diesel transfercase, be incorporated as one of the parts of a psru ?More specific for the housing for the ouput shaft. The piece that contains the ringear and planetset must still be machined.The housing is 8,5 inches long and contains a needle bearing (front and place for a oilseal)
Found it on ebay and on first sight, looks like the old Ross psru casing.This casing is rated for 460 Nm torque.