You can do the math and see what RPM you'll be running at what speed with which gears.
http://www.onlineconversion.com/bigger_tires.htmI have run 5.14, 4.56, and 4.10 in my 1 tons (different times) all with tires 32-33" tall and direct drive transmission, and either 235 or 228 engines.
5.14 is just slow, plenty of power but not much road speed.
4.56 is better, still wish for a faster gear, only occasionally wish for more power.
4.10 is pretty good all around, usually fast enough, usually have enough power for high gear on most hills, but not much extra. Down shifting is always an option.
3.73 I have not used, but will try it next. I suspect it's geared to fast for the little 228 in a truck that weighs 4,500 lb or so. With more power 3.73 might be a likable gear ratio on a 3/4 or 1 ton, but stock I bet it's a stretch unless your truck is light and you live in the flat land.
With increased speed stopping becomes even more important, the old brakes might not do well enough, and otherwise your suspension and steering need to be in great shape.
Your situation will vary if any of the following are different than mine; road conditions (hills), driving style, engine, transmission ratio, tire diameter, and vehicle weight.
Use the gear calculator and adjust your expectations and plan to suit your situation.
Grigg
