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I am doing the FRPP Hot Rod Cams on my 07 GT and have heard rumors that i will have to go from my 3.31s to the 3.73s. i don't race the car, well seriously anyway. but if it's a must just want to know before the cams get installed.
 

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I think that it would be a waste if u don't put the gears in. 3.73s are a good gear for both street and racing. well worth it
 

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with the cams you're going to loss a lot of your low end torque. especially with a 3.31 gear which is already sluggish you'll want to upgrade to 3.73s or maybe even 4.10s. the lower (higher number) gearing will make up for that lost off the line torque.
 
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