3 Speed Overdrive Wont engage

[CATrucks]

So I found me a muncie three speed overdrive, had my transmission guy rebuild it. Finally got it in the truck, hooked up the lockout cable and wired up the switch and solenoid. I did the basic wiring, not using govenor or kickdown switch. I bench tested solenoid, it works, can hear it go in and out when I flip the switch in the truck too. So I take it a test drive, push in the lockout cable so it is freewheeling, flip the switch to engage solenoid, let off gas, then gas back on, no shifting into overdrive... I checked the lever for the lockout cable and it goes all the way in each direction. Any ideas as to what the problem is?

Thanks

Joel