The AWD system is called ATTESA E-TS and it was used on the R32 and R33. The G35x/Skyline also used this system and not the ATTESA E-TS Pro which the VSpecs and R34 used. ATTESA E-TS always did front to back torque split, the Pro system made it for each wheel too.
VQ35DETT never was in production and certainly not in the 90s.