Solved: Transmission shifting late and downshifting early

I have never worked on A/T much, just something I never learned to do. I need some help. I recently changed the filter and fluid but it did not fix the problem. I read all the troubleshooting steps but, I don't know what the most likely cause may be. My 318 with a 904 shifts late. The manual says 1-2 at 10-15 mph and 2-3 at 17-23 with down shift at 7-10 mph. Mine is 1-2 at 20mph, 2-3 at 42 mph and downshift at 35 mph. I'm not sure where to start looking. Craig

Problem solved. YA'll were close....:oops:I forgot to put return spring back on after adjustment. Thanks