E46 328i manual conversion part question

[bikerz]

1) do i need to change my rear differential?2) if yes, what is the ratio good to my car?3) do i need to change meter and ECU?Because I get alot of conflict info, some say need to change, others say no need. I really need this info before i do my conversion because i really hope my conversion doesnt be my nightmare.If anyone who had been through this process, please do share your experience and knowledge.

 

[Galaxy7]

in my honest opinion:

1. probably yes because auto and manual gb have different ratio for the same cc category. read this http://www.bokchoys.com/differential/GearRatios.htm
2) refer the link above
3) no need for auto to manual conversion. but if manual to auto, u have to get the auto gb ecu. meter no need to change for both conversion.

your current auto rear diff must be 3.46(if still in stock condition) and the standard manual rear diff for your car is 2.93