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Message: <blockquote data-quote="LAFENATU" data-source="post: 544591" data-attributes="member: 10097">D4 would be a 1974 Block.Before planning many engine mods to an AODE/4R70W equipped vehicle, you should install an AODE Valve Body Kit/Shift Kit. Installation of the Valve Body kit will allow 1997 and earlier AODE/4R70W transmissions to perform reliably in a 350 to 375 horspower application. 1998 and later 4R70Ws can handle up to 500 horsepower with just the addition of the Valve Body kit due to a hardened input shaft and the one-way mechanical diode. Karl Baumanns website has TONS of FAQ's about the AOD/AODE/4R70W<a href="http://www.becontrols.com/ourfaqs/index.htm" target="_blank">http://www.becontrols.com/ourfaqs/index.htm</a></blockquote>