In a US spec gt/gti, the only difference is the diff is physically slightly larger and only comes in a 4.1 final drive, swift/geos come with 3.52, 3.79, 4.1 and 4.389 final drive ratios.
Same actual gear ratios, same bearings, same syncros, same hubs etc etc, externally the gt box is the one with an extra lug on the housing for a brace that bolts to the engine, good luck trying to fine a gt transmission is reasonable working order, pretty much all thrashed from the high revs and old age.
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