Formula Hybrid
Strongest box; TT, Aristo & Tiptronic.
Strongest torque-converter; TT, Aristo & Tip. (Thickest bolts 12MT x 1?)
Strongest bolts - t.c. & crank; TT, Aristo & Tip. (no. 11's)
Flex-plate; TT, Aristo, Tip or GS430. (Bigger bolt holes - V8 t.c. & f.p. parts are a lottery)
Most efficient compatible valve-body; Supra N/A or GS300.
Bell-housing from; engine type used.
Transmission cross-member; TT, Aristo, Lexus 5-speed, 2J VVT-i's, LS400, Soarer V8 or GS430.
Sump, dipstick & tube, for 1 & 2J; TT, Aristo or Tip. (Larger than GE S6 fluid capacity - largest is GS430 5-speed + re-cal dipstick)
Sump, dipstick & tube, for 1UZ; GS430. (Largest V8 fluid capacity + re-cal dipstick)
Prop-shaft front section; car box taken from.
Prop-shaft tail-section; car box going into.
Line-feed cable from; car going into, or bespoke.
There are a few internal bits and pieces to swap & tinker with that I have not divulged, to prevent tears.