Blinder

Hello All

Stupid Question.

Was given an M41 gearbox with attached J type and told it was working OK. I have connected these up to my B20 and I am ready to drop the engine back in the car.Turning the crank over-the rocker gear,valves etc do what they should. If I slip it into gear I can feel the resistance so assume the gearbox is working OK. But the flange on the overdrive remains static.

Does the overdrive have to be wired up and solenoid engaged to enable the flange to rotate? Don't want to have to fix any problems under the car.

Many Thanks
Brian