Issue was RB box on the Rb25 (R32) is a small housing box and not as beefy as the later model R33 and R34.
Apparently the later boxes share bits with 300ZX and Rb26 internally. (30 Spline)
The 32 GtST box is similar to the sr20 box. (24 Spline output )
So as soon as the wrecker has a box ill exchange it.