30 year mechanic, 8 years in heavy duty (journeyman certificate)and 22 years at a Toyota/Lexus dealership. Have my journeyman's certificate in automotive as well as I have my MasterTech qualification through Toyota.
I cut the anti-squat wire for the transmission on my sc400. Found the info on this thread http://www.clublexus.com/forums/performance-and-maintenance/380511-want-better-low-end-performance-try-this-its-free.html It does make a noticeable difference in the shifts.