Originally Posted by
Frank87
I have also checked this out for the 5HP18 but upgrading this box in a similar way is not feasible. The drums are too small and a V8 version is already stacked close to clearance. In addition, 2 drums are made of aluminium and always show wear on the teeth from the clutch plates. This means these drums can actually not handle the 310Nm torque max.. Even if you increase clutch strength, the limiting factor here is those 2 soft drums.
A 5HP24 would be a great upgrade for any M60B30 also because it shifts better due to not having a brakeband. However the 5HP24 is a real OBD transmission and probably won't work in an E34.
I do not yet have the knowledge HOW a gearbox program works and if you can in someway reverse engineer and map it like you can with engine computers.
5HP30 on a 4.0 harness is the way to go. That extra weight is no factor to me. Less cargo and lose some weight yourself.
But the hp30 requires the 210 driveshaft, differential, output shafts, brake hardware. A spare 540 is crucial (which I have).
95 E34 530I V2.37
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John F. Kennedy