Anyone else having this issue?  Hard to test solutions as much of the time when cold enough, it’s also wet/slushy.  Starting with the obvious (relay fuse/contacts, solenoid connections, relay change, then solenoid change).  I’m thinking it’s unlikely to be a temp-related internal trans./OD issue, since once the engine is warm, so is the trans.
Sometimes the OD won’t engage until the engine gets warm, but on a recent sub-freezing drive, it never did. Anything I’ve overlooked?  The kick-down switch is fairly new, and functions normally.  I suppose cleaning those connections/contacts could be included eventually.  I will need to drive a fairly long distance trip this winter, and would hate to run at 3000+ revs. for very long on the highway.

6 VOLTS/POS. GRD. NW INDIANA