Thread: Which rear gears for Ford 302/T-5?

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What is the operating range of your cam? Overdrives can be nice ,but if they get rpms below the cam range performance and mileage will suffer,

I have 3.89 gears in my '32 with 30 inch rear tires matched to a 700R4 overdrive. It is perfect for what I like--cruising around town in drive and cruising in overdrive at 70-75 mph on the interstate all day long and never exceeding 2200 rpm.

Originally Posted by 53 Willys

What is the operating range of your cam? Overdrives can be nice ,but if they get rpms below the cam range performance and mileage will suffer,

Here's the spec sheet from the cam builder. I was originally going with a C4 auto & 3.0 rear gears but decided to switch to 5 speed. I'm not quite sure how to interpret these numbers.....

With those cam specs, I would say definitely 3.89's.