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Message: <blockquote data-quote="Lionel_Koh" data-source="post: 337773" data-attributes="member: 205">M42 flywheel is too small to handler d power of M54B30 ....... U can use back d gearbox which is getrag 220 ...But u need to change d flywheel to at least 328 with 9 inch clutch ...If can get d E36 M3 flywheel then even better ..... For d rear axle .....M42 using 3.45 which is too high for M54B30 .... U need 3.15 and below ratio to get a better rpm especially at d high speed ..... Another thing ...ur M42 rear axle is a small housing .....so if u change to 3.15 ratio or below which is big housing .....u need to change d drive shaft and u might need to modified d long shaft as well.... hope tis will help ....</blockquote>