I have a '08 Tahoe, a week ago I changed the tranny fluid to amsoil, 56,000 miles. I pulled a cooler line and pumped out all the old dexron and replaced all the fluid with amsoil, also did the filter change. Now I am getting a weird gear oil smell even though the tranny is running cool, maybe 185 in city traffic, more like 165 on the highway. Anyone else experience this? Also the tranny has slipped a couple of times under hard acceleration, anyone experience this? I am starting to wish I had left well enough alone.