I have just swapped out an 01 4L80-E transmission with an 03 4L80-E transmission I used all of my sensors and hardware on the used one and it shifts a little hard in second and harder in 3rd. It started shaking the whole van yesterday when I went up steep hill. I pulled over put in park then put back in drive and it's been ok. Do I need new sensors?? I'm dumb when it comes to transmissions!

2 pulleys I have here 56mm OD don't have the right spacer, them are 9mm, and the right distance is 6.5mm
it is essential to have the right distance, in order not to wear out the belt