Good going guys with the advices. At first, I had no success trying to run full synthetic in my A-833. When I pushed it, it wanted to grind at every shift, even though it shifted quietly, all-be-it somewhat slowly, with the 50/50 I had been running up to that time.(50% ATF,50%EPgear oil).I took the tranny down multiple times for modding,eventually getting it to shift sweet at 7200rpm, with the synthetic oil. Those gears must be heavy at redline. All the usual mods, but left the brass rings in it for street. Hope you can get with just a fluid change, and linkage adjustment.best of luck.