Technical Toploader info

Are the later toploader gear boxes the same size as 39 and older?
And are they stronger?

 

Later like this four speed toploader, 1960's style, most Ford hi-perf cars used them.


39 style three speed.


Worlds apart.

 

The later is much stronger. I swapped my 39 3 speed for a 3.03 ford top loader 3 speed with a Jeep shifter conversion and I beat on it pretty good. Plus it’s fully synchronized.

 

Or is the OP referring to a 3 speed top loader from a flathead era p/u which be open drive shaft?

 

Im thinkin about the flathead era 3speeds and power handling. Can a 36 handle more power than a flathead? Is the 39 better? I know about the better syncro. Im not going to burn tires and such.
So question is, is there a go to gearbox of the same size or can one buy new gears that handle more power?