Since when did fram market trans rebuild kits?

The trans I'm considering this for isn't driven crazy, (hey it's a heavy late B body, 318, 2.76 gears) just starting to show signs that the piston seals are probably getting hard, still soften up and do their job as the motor warms up
doesn't drive like it used to, until it warms up. Fluid is still very red but starting to slip a bit when stone cold and when not driven regularly (when pulled out so I can use the garage in the off-season to work on something else for example)
Only 56k original miles on a 78, just needs a freshen up.