If you take the whole lot out and plonk them as is into 2.5 casing, yes - no mods... If you only want the 6th gear - then there will be some work to doPud, just asking, as I have idea about any diesel gearbox. Would the gears from the 1.9 box fit directly with the rest of the 2.5 gearbox ?
ie, with no modification ?
In the comments:
sibin99 : 3,0 v6 24v gearbox and flywheel from 156 2.5v6
3rd gear just below 140km/h on redline looks 2.5 normal
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