rear end gears

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12-15-2009, 08:17 PM

#21

OCHOHILL

2nd Gear Member

Join Date: Jul 2009

Location: az

Posts: 459

Quote:

Originally Posted by adutch06

I have a 302 small block, 4 barrel Holley, RPM air gap intake, b303 ford racing cam with 480 lift, aluminum pro comp 210cc heads, Roller rockers, holley 90psi electric fuel pump, t5 5speed trans. I was giving a 9inch ford rear end from a buddy in oklahoma and i need to rebuild it. Im not going to drive my mustang on the highway much, if at all, so i want a pretty high gear from great launches and accel. What gear should i get? Also if someone had a guess, How much HP could my motor make?

Thanks
Aaron

As far as the HP you are making will depend a lot on the tune. I don't know much about engines but I think 210 cc head runner volume is a bit much for a 302 unless you plan on a whole lot of rpms. I have 3.89's with a T5z in a similar setup on 25.5" tall tires. I am making less hp than you and I get through the gears quickly. The more torque you have the shorter(think smaller number) the gear ratio you can run 'cause the engine can pull it.

Your tire size may help you choose your rear gear ratio. For me 3.89 gears would be my limit with my current set up or a set up with a little more power. A lot more power and I would want 3.70's.

Based on your post, I would recommend 3.89's.