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When i get my mustang, i plan on upgrading everything i need to, to handle 500+ HP, once everything is done, i will be installing a whipple supercharger
My question is is there any need to upgrade the stock 3.55's for 3.73's
this will be my daily driver that i will probably take to the local drags once or twice a year
i will be upgrading the driveshaft for a single pice
No need to change the gears if you do not want to.
Plus the difference between those two ratios isn't worth the cost. You need to make a bigger jump to actually realize some difference. But with the power you are planning, 3.55's will do just fine.