I have a 1995 Dyna Wide Glide with 35,000 miles on it. I just changed the transmission fluid to Amsoil and now it is slipping. I rode it today for the first time since changing the fluid and it is slipping in 4th and 5th gear. It has never slipped before. Could I have under or overfilled the transmission and caused this. I also changed the primary chaincase fluid at the same time. I am able to do most repairs myself, so I could use some help as to what might be causing this problem. Thank you for your help.