Of course! In my position with the company I'm able to work a bit outside the box, as well as tasked with keeping up on new industry news, so others many not even know about the 4 speed auto options.
Im not familiar with jakes, but the 4l80 is a big fella...not sure how much surgery you want to get into.
But yes, give me a call any time. I'm ext 1010. Leave a vm if I'm tied up. Will get right back with ya.