how many rpm's will i drop going from 3.91 to 3.55????????????????

Took my ride for a few rides the last 2 days/ man I wish it had MORE gear, like 4.10 or even 4.56's

4.56 would be the "perfect" gear for the 340 it seems, 1st gear is nice with the 3.91's but 2nd gear is lugging a bit till its over 55 mph and 3rd gear seems like a nice cruising gear till over 55 mph.

Now the engine does seem happy around 2200 rpm so I guess it be nice to have that and 70 mph vs 40 mph but when you get on the gas you can feel its being held back just with the 3.91's let alone 2.94's.

So I my 3.91;s and 27 inch tires IS a compromise, going any taller would just make it a nice driver...like the new cars are toady, lol