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Message: <blockquote data-quote="ALBundy" data-source="post: 104806" data-attributes="member: 15">Even though the 520 and 525 cars both used the 5hp-18 tranny, the internal components of the gearboxes have some differences. Firstly the 525 tranny has more clutch discs, certain gear has more than 1 clutch plate extra and so forth. That being said, the torque converter is also about 3/4 inch bigger in diameter. I supposed if you are slow driver, then the 520i gearbox should be pretty okie. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />The 5hp-18 tranny is good for up to 300 NM, problem is they never said whether its a 525i 5hp-18 or otherwise! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /></blockquote>