What is a Worford transmission?
It's an aftermarket pass thru transmission. There are 3 basic types, 3 speed having underdrive, direct, overdrive and the other 2 are ether direct with underdrive or direct with overdrive. Google MTFCA; Warford there has been a lot of info posted in the past.
And to add to what Mark said, the Warford was a very popular add-on tranny "back in the day." It had no synchronizers on the gears, and it was tricky to shift. They are now being reproduced, but with gears like a race car or motorcycle so they shift easily. They are a fine piece of equipment, but pricey. The new ones ("KC Warford") give you Ford's two forward gears plus four more, for a total of six. Elmer Layne makes them; Birdhaven sells them.
Also available from the maker. They also shorten drive shafts. http://www.laynemachine.com/Products.html
Lots of us have the original Warfords and really love them and often can be found here or on Tbay. They are a pretty easy installation and it's hard to say which I like better, the Underdrive around the neighborhood and parking lots or the Overdrive on the freeways and open roads. Many of the trucks had cast iron but today the alum cases are preferred. If you haven't Googled Warford yet check it out.
The shifting is sort of like a old standard tranny using no clutch. you just have to match the engine speed with the transmission. Pretty easy after a few tries.
I have a KC Warford in my 27 Tudor. I really like it. This car has 4:1 diff. gears so pulling hills is much easier. The OD gives a good top end RPM.
To add a bit to what Gene said, I bought a '26 Touring that has a Ruckstell "AND" a Warford! Not sure I'd have built a "T" this way (with both) but I can tell you one thing,..... that with everything in "low", it makes loading the "T" on a trailer absolutely foolproof! I literally "crawls"!
But remember one thing. not sure about the newly designed / built ones, but with the originals, just like a Ruckstell, if you miss a gear change, you ain't got no brakes till you get the thing back in gear and I know someone who can confirm that is not always easy. Luckily he and his wife did survive!
If you are going to invest in such an item, I'd fit a set of Rocky Mountains or such first.