Need some help with my auto trans please

Before you CHANGE anything, get WHAT YOU HAVE operating CORRECTLY FIRST.

The caps are not me yelling, but just stressing important stuff. lol

There are two cables. The park cable and shift cable. As said, the factory service manual will make it very easy for you to adjust it correctly. I would also recommend adjusting both bands. The factory service manual outlines that, too.

It also has manual linkage for the throttle pressure (kickdown) that should be adjusted correctly. That can have a huge impact on when it shifts.

Get it right FIRST, then see if you still want to modify it. You may well be happy with it once all is adjusted correctly.

Good luck!