What's the spec? If for instance you have a very mild cam with a 215 to 219 spec then chances are the engine is all finished making power by 4,500 to 5,000 RPM and 3.73 gears won't be a perfect match at all.īut if for instance you have a cam with a duration spec in the neighborhood, then the engine should make power right up to 6,000 RPM, and in that case, a 3.73 gear ratio would be more at home. But you'll also have to consider the camshaft you presently have in the engine. If you want a considerable acceleration difference from a gear swap alone, then going from 2.73's to 3.73's will fill the ticket. You'll notice a drifference, but it won't be a major one. ratios of 16 : 1 on center and 12.4 : 1 and only took 2.9 turns of the wheel. Another thing you have to consider is that if you'll be relying on a rear gear ratio change all by itself to improve your 0-80 MPH acceleration, then don't expect a whole lot from going from a 2.73 ratio to a 3.31. I had 26.5" tall rear tires, and a 4 speed manual trans, and it reved at 3,200 RPM at 70 MPH which was tolerable for me. But it's all about how you use your vehicle and how you drive, and what you want out of it. If i was cruisinf for lenghthy stretches on the highway on a regular basis, the 3.73's might have been changed for a more conservative gear ratio. With the 3.73 gears, I took that car on a 150 mile interstate trip now and then, and it was fine cruising at 70 MPH with occassional 100 MPH blasts when the traffic cleared, but that was only once or twice a year. But if you drive 20+ miles on the highway atleast a few times a week, having the 3.73's might get old quick. 5 miles of that commute was on the highway. I had 3.73's in an old Vette that i drove three days out of the week to work and back for 6 years, and I liked it. I agree with what Derrick and some others said: 3.73's are just fine even without an overdrive trans unless you like to cruise at 80+MPH. Brand Revolution Gear and Axle Price: 102.99 Application Chevrolet Camaro 1970-81 Chevrolet Chevelle 1968-72 Chevrolet Malibu 1968-72 Chevrolet El Camino. You're going to get an array of varied answers on this one.
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