Z axis won't go up after changing to lead screws

[bugwhat]

Hello,
I can not find where to post to the forum.

I have had this I3 Pro X for about 4 years. I haven't used it much lately because it does not print extremely well. I have added parts to make it better and so far it is only slightly better.

I replaced the Z axis threaded rod with T8 lead screws and now it seems the stepper motors are not strong enough to lift the hot end rail, ALL the stepper motors I have are the same (42SHD0217-24BF), or I would try swapping them. I edited the code: M92 Z400, it was Z2560.

Any help would be appreciated.