Ford 9in gear ratio

[motomaster_707]

I have a extended cab f150 with a C6 behind a 302 runnin 405 hp and 380 ft lbs torque at 6500 rpm. What is a good gear ratio so I can get in the triple digits on the fast sections and not stuck between 1st and 2nd or 2nd and 3rd in the slower more technical stuff. I don't know much about rearends so any help is appreciated. I have 4.56 in it now but haven't got to run it due to it still being built. Thanks in advance

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[yzcrasher]

Are you still going to use this on the street, or dirt only? what size tire? If dirt only,on 35" or 37", you want 5.50 to 6.00

[Ramsey_ElWardani]

I ran a F150 in Stock Full for several years and tried all sorts of ratios. With 35" tires and 450 HP my favorite was 4.10 and we often saw speeds of 115.

[CraigMT]

It will depend on your tire size..... But with a ratio of 5.13 + or -, and a true 33" tire you should be able to get into the 'over' 100mph range (over 5000 RPM's) depending on trans stall/slippage.