Fresh 5R110 Tranny issue

[Biggsw784]

Just had my tranny rebuilt with a rcd converter and suncoast ironpack 3 rebuild kit and after getting it back it is acting wierd into reverse. Once I put it in reverse, I have to barely hit the throttle for it to engage. Now once it goes it is perfect. Now 1st gear is doing it only sometimes though. I am thinking it is the solenoid that controls the low/reverse since they are on the same circuit. I was told that the location on that solenoid was on the back row on the drivers side?? Has anyone seen or heard of this issue before?? Thanks for any info.