Yes, killing power should release the solenoid. And there is a mechanical stop that keeps it from going into reverse. As I found out it can be defeated with force by breaking something. Had I stopped to think I would have realized it was locked out but I forced it as if it were a linkage problem.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.