m52 setup questions

[matt86]

I have a m52 engine with m42 gearbox, clutch and flywheel.

Was wondering what diff and prop I should use as I don't understand ratios. I want good acceleration, not bothered about fuel consumption, but also don't want something that is high revving on the motorway.

Would a m40 or a m42 prop and diff be best and what ratio?

Thanks

[Brianmoooore]

If you've used your existing diff., then the revs. for a given speed will be exactly the same as they were before the swap.
If you want it to rev. less for a given speed, then you need a numerically lower ratio that whatever you have now.

[DanThe]

Most use a 3.64 with the M42 box

[matt86]

Thanks Brian and Dan.

One more question will the existing m10 prop and differntial mate up with the m42 gearbox. I think I was told they wont, but will with a m30 conversion due to a different bolt pattern on the gearbox housing

[DanThe]

320i prop is normally used