2.76 to 3.91's SG

I have had about all the popular gears over the years. 3.23,3.55,3.91,4.10 etc... I've mostly had 3.91 gears in the majority of my cars,but remember I think things were a little different 10 even 20 years ago I think peoples driving habits have changed they tailgate a little more use electric devices, now a days I prefer a 3.23 or a 2.94. But I am also getting older I think I might have slowed down a little. By the way you won't notice to much of a difference between the 55's and the 91's, also people seem to get real hung up on these casing's 741, 742, and 489 good, better , best. Bottom line highly and I stress highly unlikely you will ever break any of them, unless you are making some serious horse power and if you are to would have to get all the traction to the pavement. I ran a '70 Challenger (90's) w/440 4-speed 3.91 741 casing never a problem. Ran a '70 Charger (80's) 440 727 3.91 721 casing never a problem. hopes this helps.