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Rb25 engine and gearbox swap 180sx

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Hey guys I’m just wondering how to rb25 engine and gear box swap a 180sx I’ve currently got a rb20 gearbox in the car with a 25 sitting in front of it (also using a r32 engine cross member) but had a change of heard for power numbers and now I’m wondering how I can fit the 25 gearbox but no one online seems to give clear description on how to do it 

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unbolt rb20 box put in 25 box, weld metal tabs to extend gearbox mount so all 4 bolts line up, get new tail shaft to suit gearbox & length.

Exactly how I did mine 11 years ago....... 
Keeping Assessor Training Simple

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