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Message: <blockquote data-quote="ess530i" data-source="post: 338845" data-attributes="member: 13496">t2ribena i think the upshift issue has got to do with your engine/tranny overheating problem. the gearbox goes crazy when overheated. suggest you look into the cooling system first before spending money on the tranny. i think the ZF gearbox in the e60 is very robust and not easily damaged even by hard driving. i had similar problem with the tranny and occasional overheat problem before turn out it had something to do with the installation of my supercharger. a leak in the sc caused rapid misfires which increased engine heat & gave wrong signals to the tranny. the tranny communicates with the ecu and reduces engine power during gearshifts so there may be some miscommunication there. now the sc is properly installed and absolutely no more problem with the tranny even with on wheel 257HP/325NM power. changing the tranny & differential oil helps too. this is just my opinion from experience...u may do a little reading on the ZF transmission at <a href="http://forums.e60.net/uploads/1162137709/gallery_237_213_323991.pdf" target="_blank">http://forums.e60.net/uploads/1162137709/gallery_237_213_323991.pdf</a></blockquote>