Longfella (sorry, I know you've told us your first name, but I've forgotten)- All that sealant everywhere just means that whoever built it is too lazy to clean all the mating surfaces properly; that fact in itself doesn't necessarily mean it wasn't built correctly, but if he cuts corners there, you never know what will be inside...
As has been mentioned, talk to Kirk. To determine what ring & pinion is actually in the trans, with the rear wheels (or brake drums) off the ground, put it in 2nd gear. Mark 1 tire (or drum) at the top. Turn the input shaft by hand with a clutch disc, noting the # of clutch revolutions needed to get 1 complete revolution of the tire/drum. 9 revolutions gives you a 4.375 r&p, 8 1/2 turns= 4.125, and 8 turns= 3.88
Once you know what the r&p is you'll have to resort to Mitch's methodology (and math) to figure out what 4th is. Take the time to figure it all out so you make sure you're getting what you paid for. Al