Mats wrote:Not sure about this but the diameters of the shafts between the Alfetta and 75 boxes are not the same, neither is the splines for the fifth/reverse gear assembly.
today i striped down 3 gearboxes
1 alfetta gtv 2.0 karb(41/10) 1alfa 75 2,0 karb(43/10 ?!?) and 1 from 75TS(41/10LSD) good news are that pignion shaft are identical
so if clutch shafts are same its posible to make close ratio set ... i want to transfer only 1 gear from TS to alfetta , so ratio spacing will become ever close between famous 1-2 shifts and less abuse for synchro
but diameter of 1 gear on clutch shafts is so small .. i doubt is it posiible to cut then spline-press on maschined alfetta shaft
clutch shaft reverse-fifth gear have completely differnet splines ... may be 3-4 is different too 
original tickness is 2mm .. on my TS box was 0.5mm 
this clearence cause pignon shaft to float for-backward