There Toyota 5-speed manual gearbox with OVERDRIVE???

OVERDRIVE is possible to install a Toyota 5-speed manual gearbox??? (H55 - R151 - R150)
I could only get information regarding FAIREY OVERDRIVE for 3-speed manual and 4-speed manual gearbox.
What is the difference between a Toyota OVERDRIVE automatic gearbox and manual gearbox???
Thanks for your help and comments...
OVERDRIVE is possible to install a Toyota 5-speed manual gearbox??? (H55 - R151 - R150)
I could only get information regarding FAIREY OVERDRIVE for 3-speed manual and 4-speed manual gearbox.
What is the difference between a Toyota OVERDRIVE automatic gearbox and manual gearbox???
Thanks for your help and comments...
