As i recall, the '84 Y manual trans was the 4+3 OD (late Super T-10 with planetary OD box) - OD engagement was ecm controlled in top 3 gears. '85 added an driver override switch. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.diy-efi.org/pipermail/gmecm/attachments/20000107/e6cdbd7d/attachment.html>