Differences between 1/2 and 3/4 T frames (47-54)

[markmdz]

So I know this one has been discussed a few times in the past, but what I can't find is any hard specs. I've read that the 3/4 T frames are more narrow behind the cab than the 1/2 T, but how much more narrow?

Are the frame rails taller as well?

I jumped the gun and bought a Speedway triangulated 4-link kit but now I'm reading that the 1/2 and 3/4T frames are different out back. That's obviously a bit of a problem for me considering I have a 3/4T ('47 3600).

So now I need to determine how much of a problem it really is, or if I could easily modify the Speedway kit to adapt it to my frame.

Any and all help is greatly appreciated.