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WVZR-1 · 05-28-2013

There's not a "single" gear set that can be said to be "best". NONE! Serious thought should be put into a gear set and NOT just because he said, he has or what ever. Tire size, fly-wheel weight, engine modifications and the topography of where the car sees the majority of use are all equally important. John has 4.10's, but John has 315/35,s, Dick says John has 4.10's I need them but Dick has 345/19's, John has a 14# fly-wheel, Dick has the stock 40# fly-wheel, John's a "flat-lander" in Ohio or Indiana, Dick's in NW PA in the hills and his car sees an Interstate twice a year. There's "no similarity" in what could be considered a "good choice". 6th gear creates I believe the most heat of any of the transmission gears and I don't believe you'll often see O/D ratio's calculated into a power-band of a drive-train. I'm not a "flat-lander" and my car has seen 6th maybe less than a dozen times, way less.

There's an RPM and a gear that you're comfortable with and that RPM is one that you know the car will accelerate to suite "you" from. A gear selection should I believe be based on that.

3500 RPM in 4th gear with a 315/35 tire and a 3.45 gear should be something near 78 MPH, a 3.73 takes that MPH to 71, a 3.91 takes it to 68 MPH and a 4.10 to 65 MPH regardless of mods.

If your intentions are drag racing often/frequently that's a different conversation, ORR really different conversation and I don't believe you'll see an ORR guy discussing 6th gear either.

05-28-2013	#16
WVZR-1 Join Date: Oct 2004 Posts: 1,884	Re: Gear ratio choice There's not a "single" gear set that can be said to be "best". NONE! Serious thought should be put into a gear set and NOT just because he said, he has or what ever. Tire size, fly-wheel weight, engine modifications and the topography of where the car sees the majority of use are all equally important. John has 4.10's, but John has 315/35,s, Dick says John has 4.10's I need them but Dick has 345/19's, John has a 14# fly-wheel, Dick has the stock 40# fly-wheel, John's a "flat-lander" in Ohio or Indiana, Dick's in NW PA in the hills and his car sees an Interstate twice a year. There's "no similarity" in what could be considered a "good choice". 6th gear creates I believe the most heat of any of the transmission gears and I don't believe you'll often see O/D ratio's calculated into a power-band of a drive-train. I'm not a "flat-lander" and my car has seen 6th maybe less than a dozen times, way less. There's an RPM and a gear that you're comfortable with and that RPM is one that you know the car will accelerate to suite "you" from. A gear selection should I believe be based on that. 3500 RPM in 4th gear with a 315/35 tire and a 3.45 gear should be something near 78 MPH, a 3.73 takes that MPH to 71, a 3.91 takes it to 68 MPH and a 4.10 to 65 MPH regardless of mods. If your intentions are drag racing often/frequently that's a different conversation, ORR really different conversation and I don't believe you'll see an ORR guy discussing 6th gear either.