I have a 2007 TR-3650 and found that the RPM or input shaft or whatever that keeps spinning after you floor the clutch pedal, takes a few moments to spool down when it is cold. Once everything gets warmed up, it seems that it doesn't take as long for the synchros to do their job. For instance, if I left my house with a cold engine/trans, doing a simple 2000 RPM granny shift from 1st to 2nd will require a lot of effort to push into the 2nd gear gate. Now, if I revved to 2k, clutched out, and waited about 1-2 seconds, it will be easier to shift into 2nd gear. I used 3 qt of Redline High-Temp ATF, but the same thing happened with the factory fill ATF. I suppose if you're not careful about this, it can wear out the 2nd gear synchros which seems to happen to some people.