was there a combination of years, motors, that they put different
gears in? if was looking for a 4.10 ratio what year bronco or motor
size should i be looking for? Anyone have some sort of list?

 

I think your best bet to find stock 4.10s would be an '87+ with the 302 and 5 speed manual.

 

Were 4.10s available in any of the Broncos? I thought you could only get them in the trucks. Or was it a special order item?

 

4.10s were avail in Broncos, but I've never seen them w/the 351 or any auto tranny. Not sure on the I6. Anything is possible, tho. I think sometimes Ford just tries to use up what's lying around and throws a truck together.