[400TT]

The GTR centre has different drive flanges, actually just about everything is different. Just about all Harrisons with Skyline rears have R32 GTS-T diffs fitted, certainly a more than capable rear-end.

We use one of the rear(diff) speed sensors for speedo etc. Not all diffs have the sensors as the sensors only exist if the vehicle was fitted originally with ABS. All GTR's had ABS. Even the mounting flanges are removed on non-ABS vehicles.

We also have a front wheel speed sensor fitted. Originally fitted for traction control.

Can't you just fit ABS Commodore hubs to the front?