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Would the [56A 4-speed] gear box be able to stand out for long [with an A15 engine]?
Probably. The 56A 4-speed is a lot stronger than the 56L 4-speed that came in the Datsun 1200s. The A version came in B210/B310 and 1200 truck/ute/pickup. I was using a 56A 4-speed with my 1500 cc engine and it was holding up fine.
The 56A 5-speed will be weaker than the 56A 4-speed. The recommended transmission for an A15 is the 60-series 4-speed, that's the one Nissan fitted behind A15s.
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