TF 998/999 parts into push button 904 ?

Some of the A998 parts will fit; others won't. If you want to run the wide-ratio gearset, you would need to use a certain mix of parts off various-year 904s to make it all fit/work in the trans and still accept the pre-'68 small-nose torque converter which is the only type that can be used with a '67-down crankshaft in the engine, unless the crank's rear counterbore is enlarged to accept the '68-up large-nose torque converter. I'm sorry, I no longer remember the recipe as far as which specific parts from what specific transmissions you need to gather up and assemble. I did this a few decades ago because I was convinced the wide-ratio gearset would make a big improvement in my '65. I was very, very wrong; I regretted it a couple of minutes into the first test drive, and only stopped hating the transmission in that car once I yanked it and swapped in a trans with stock-ratio gearset and without the hodgepodge of parts.

The wide-ratio gearset was intended to cope with super-tall 2.45 and 2.26 rear axles Chrysler were putting in passenger cars because they didn't have a 4-speed overdrive automatic like Ford and GM did. The wide-ratio gears didn't work well for me in front of my 3.23s, and even when I tried to save the project by swapping a 2.76 centre chunk into the 8-3/4" rear, that just made it suck somewhat less.