727 Disassembly and Advice

Well I've run into another issue here.
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The forward Planet gear assembly housing is cracked pretty bad, as well as one gear having some bad wear on it. Looks like I'll be getting a new one.

There's currently 2 on ebay, a 3 pinion for $65, and a 4 pinion for $125. If I go to 4 pinion, it doesn't matter that the rear planet set is still 3 pinion right? I know the 4 is stronger than 3 so I don't mind going for it as long as I only need to get the one. Also, are there any differences in the years for the planet gears? Do I need to get a specific year range?

Also another thing I saw on the Rear Planet, one of the pins that holds the gear in place was loose, easily slid out of its bore. Are these just put in and then the end hammered to shrink the bore a bit on the end?
Hell's bells?I can't even believe you paid four hundred dollars for this used transmission... Really? I don't like to pay over a hundred and fifty bucks.For an unknown used seven twenty seven or 904...
I would say bad luck of the draw.Look for one under two hundred dollars and start over again... you don't want to go down an Avenue of tons of expensive parts... that would be throwing good money after bad...