Can i fit RR diffs and 7.50's?

Hi all

I am just finishing rebuilding the axles on my S3 88" and am trying to decide wether i should fit RR classic or series diffs.

I will be running 7.50's for the extra ground clearance and is powered by a 2.5TD.

Will i be running the risk of overgearing it and potentially braking the gearbox or halfshafts if i fit the RR diffs?

Thanks

no it will be fine a 2.25 diesel might struggle but td wont