4 speed rebuild

Are the kits online decent? Brewers seems to have the most complete.

Also, I have not asked a dumb question in a while, so here goes. Why is the 18 spline A833 considered stronger than a standard 23 spline?

That is reverse of every other trans available...

Tried googling it, nada
Do you have a 4-speed in need of a rebuild?
Or are you looking for a conversion?
I am just down the road from Winnipeg.