I don't know if that's a TT or not, but if it is it's been significantly modified. Whether it's a T or a TT, the neither the front wheels nor the rear wheels look like Ford wheels. The wheel base sure looks a lot longer than a TT. I'm not sure what to make of the running board, it looks longer than a TT running board and shorter than a T running board.

I think it's some sort of TT after market kit. What say the rest of you?

Very cool photo Jay. Thanks!

Looks like a commercial job of car chassis conversion to truck. Since the picture was taken in San Francisco, this may be a Fabco conversion done across the bay in Oakland. They made outside brakes for Ts and other items.

There were several Truck extensions made for Model T one ton truck chassis.
Here is one well know one the Olson Extension.

Ford Canada, Australia, New Zealand and England used one of their extensions to make a two ton Ford Chassis.

It was an extended frame, truck Ruckstell axle with a extended tailshaft and half elliptic springs.

If these were 2-ton trucks with Model T engines and transmissions in San Francisco, I'm glad I never had to be behind one going up or in front of one coming down.

yep, I've seen many pictures floating around of the different brands. had one on mine before I bought it. my frame has the rust scars to show. moisture sets in between the frame where it is bolted together. it was an Olson if I recall but can't be sure. now on a tt in Michigan being restored. I have pictures somewhere. some were chain drive extensions. Burger, how fast can this one go? nice truck but I have to admit it looks like a true tt tortoise. maybe workhorse is more complimentary.

Thanks Peter, now I know what my TT is! It has got to be an Olson.

Did they use the stock rear axle ? Sure makes a stout looking truck frame.