Fix the Shudder in my automatic transmission on my Honda CRV

This time on Stefans Honda CRV i will try to fix the vibration problem i have had for the last year. i think it comes from my automatic transmission. i have a classic 4 gear automatic transmission. I belive i have found out that i am not the first and that there is an additive that might solve the problem. It is called Shudder Fixx