4 speed ka-booom !

^^ AJ - I seemingly short shift because it seems to run out of steam at 5900. Likely do to stock 596heads 1.88-1.60 valves ? It seems the cam and very well balanced rotating assembly want to keep going, but time slips don't seem to get better. So, I set the shift light at 5900 and completely depending on how much fun I'm having (or if that ford Mustang wants to try and get in front of me) i hold it out longer, but again time slips don't seem to show improvement.
i just had a friend who was telling me this morning in fact he put synthetic gear oil in his tranny and was having trouble. So , I'm also curious as to what marco has to offer on the subject.
now I've heard of using synthetic oil's after break in ?