I decided I was too tired after work for a 6 hour drive.
So I had another crack at pulling the 4 speed to bits. Howerever, I forgot to bring a pin punch home. Thus I couldn't knock out the roll pins on the selector forks.
But I but I did remove the countershaft, and the reverse idler pinion shaft. This opened things up, enable-ing me to make a closer comparsion between my spare (But not in deal condition) gears, and the ones in the four speed.
And in my unexpert opinion, they look very same. The only discernable difference was that the 2nd gear from four speed has two gaps in the dogs(?) opposite each other. Whereas 2nd gear from the five speed doesn't have those spaces. And for the 3rd gears, its the exact opposite. The 5 spd third gear has a couple of gaps, whereas the 4 speed doesn't. It's beyond me why they'd even do that?
My only concern is that with two less teeth where the selector ring engages, it wont be quite as strong. (And second gear gets a VERY hard time in my car. lol