Do you have any trans mount upgrades? I had the group N mount which produced a little whine on deceleration in 2nd gear. I recently installed the TiC tranny crossmember bushings and changed fluid to amsoil 75w-90. Whine increased (only in second gear, mind you), but I was told by TiC that this NVH was just due to the stiffer bushing/mounts. Just my $.02
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