Reverse lights come on in neutral (700r4)

[mosel70]

'70 C10, originally a 4-speed manual, PO put in a TH400, I just put in a 700R4 with Lokar shift linkage and a new CPP steering column (column shifting). It has the standard neutral safety switch (NSS), got it all wired correctly. I adjusted the NSS all the way to one side and reverse lights come on in neutral. The passenger side mount screw hole is about half the hole off from lights coming on in reverse.
Any ideas out there?

btw, this forum was a big help helping me figure out the wiring since it was originally a manual. Thanks!