355 diff gearing

Between the high rev necessary, (imo), to enjoy the 355 performance and the driving conditions most common in my area, I am feeling shorter diff gearing would be a great improvement. I have done this on several cars with great results, again, for my driving environment. Has anyone changed out the gears for a shorter ratio set. This is often referred to as the poor mans supercharger. From what I gather in my owners manual, it looks like the final drive gearing is 2.80, is that correct?
In past cars I have lowered gearing an average of 10 to 12%, resulting in a more responsive and available power band. With a 6sp, the difference is all positive and even cruising on the interstate, which I seldom do, is changed by only about a 300rpms rise at 70mph.
Any info appreciated, thanks, John

 

no feedback at all???? surely someone has changed diffs on one of these, or knows someone who has.

 

Eric, where are you from in Hawaii? I have spent time there every winter for 20 years, mostly on the big island. John

 

Threads did not really help although interesting. I guess Rob S. would be a good source of info though, so helpful in that way. I will post any info I get, John