So when I bought my truck the PO had told me a bunch of stuff about it and as I starting poking and prodding I was discovering things about the truck that the PO had said that wasn't true.
One of the things that what I "thought" was that the truck had 3.73 gears in the rear but when I was driving on the highway it
sounded like the truck was revving a lot higher than it was.
Fast forward a couple of months and this weekend I put a tach into my truck and was out on the highway and looked at how fast I was going... 100km/h (65mph) and looked at my tach and saw that I really was only at about 2700-2800rpms

woohoo!
So I came home whipped up a engine rpm calculator page (
http://www.csgnetwork.com/multirpmcalc.html) punched in all the data including the tire size of which mine is 28" and low and behold it says for a AUTO 2700 rpm.
SCORE!So I know now that I own a 305 with a crappy qudrajet backed by a th350 transmission ending with a rear end that has 3.42 gears!