T Frames

I am no Model T expert but I have always wondered if all T frames are the same. If say a 23 frame will fit a 27 or not?

 

26/27 frames are different from the earlier frames. 09/25 frames are essentially the same, dimension wise, though there are many minor differences in hole spacings, brackets etc

 

What is the main difference between the 09-25 and the 26/27? Length or width?

 

The main difference between the early frames and the 26-27 frame is the wide rear crossmember used in 26-27.

Length and width are same in all years. Wheelbase 100".

 

front end is "pinched" it is smaller then the back
my wheelbase is 108 ('27 roadster)
http://i12.photobucket.com/albums/a236/TrackT/100_2122.jpg

 

Stock Ford 26-27 chassis has front crossmember "ears' to attach the fender brackets, and the rear crossmember is wider. 1915-25 are about the same, but running board brackets differ early/late. 1909-14 are worth a good buck to restorers.

 

Yes, but that is not a stock T frame.

 

http://www.wescottsauto.com/WebCatalog/FrameDiagram1926-27.pdf