transmition problems
 

Hey guys, when i drive around for a bit at high speeds like the free way, and come park or come to a stop light my cars transmission makes a lot of noise like a hissing sound like something rubbing onto metal. I thought by changing my transmission fluid it would fix but i want your guys opinion before i make any fixes. thanks alot

Helps to know which one you got. is it a 3.0, 4.4, 4.6, 4.8? Need to describe more about the noise. Is it something you are certain is coming from the tranny and not somewhere else? Is the tranny reacting differently? Bucking, slipping, etc?

I have a 4.4 and yah it does sometimes jerk and I'm 100% sure it's from the tranny and like when I go from sport mode to regular drive it jerks real bad

You can try to change the fluid and see if it helps, but it sounds like you are in for a rebuild, swap or possibly the torque converter.

There is no such thing as "Lifetime" transmission fluid. BMW has since retracted this statement I think. I change mine every 75k using Valvoline Maxlife. No issues in 7 years.