If your a mechanically sympathetic driver the Series3 gearbox will be fine, I don't know where the rumour that the Series3 box is weaker than the 2A box originated, because its not . When you have them in pieces its clear that the S3 is the stronger box. Put a rebuild kit though it and it should see you out.
Series 3 LT76 Complete Overhaul BUNDLE | Online Gearbox Parts Shop
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