TKO-600 cost to convert .64 OD to .82?

[Dwight]

We talk about the fifth gear ratio but never talk about the torque range of the motor nor tire size, and rear end ratio that all play into the equation.

Does your motor have the torque at 2,000 rpms (which I consider to be a good cruising range) to cruise down the hiway smoothly, without trailer hitch jerking?

You can change tire size or rear end ratio to help.

I can count 11 different Cobras in our group that can cruise at 1,900 - 2,200 range with easy.

Big blocks and small block with carbs, that I had driven or rode with. Rears end are 3.31, 3.54, 3.55, 3.25. Tires, this I'm not as sure about but I would say 26" - 27" tires.
All have .64 fifth gear.

I have been around several that cruise at 2,800 - 3,000 rpms though the years but they were guys not in our immediate group. I kept wishing they would shift before the motor came apart but they loved the sound. Each to his own.

You can pick your parts. Build your car. If you don't like something then spend the time and money to change it till you like it.
That's why some things I did four or five times. Part of the fun.
Some guys build pyramids, some build cars. I like cars

Dwight

[Shootnride]

Originally Posted by Dwight

We talk about the fifth gear ratio but never talk about the torque range of the motor nor tire size, and rear end ratio that all play into the equation.

Does your motor have the torque at 2,000 rpms (which I consider to be a good cruising range) to cruise down the hiway smoothly, without trailer hitch jerking?

You can change tire size or rear end ratio to help.

I can count 11 different Cobras in our group that can cruise at 1,900 - 2,200 range with easy.

Big blocks and small block with carbs, that I had driven or rode with. Rears end are 3.31, 3.54, 3.55, 3.25. Tires, this I'm not as sure about but I would say 26" - 27" tires.
All have .64 fifth gear.

I have been around several that cruise at 2,800 - 3,000 rpms though the years but they were guys not in our immediate group. I kept wishing they would shift before the motor came apart but they loved the sound. Each to his own.

You can pick your parts. Build your car. If you don't like something then spend the time and money to change it till you like it.
That's why some things I did four or five times. Part of the fun.
Some guys build pyramids, some build cars. I like cars

Dwight

Well said Dwight. I have the .64 fifth gear in mine and I love it. My motor doesn't like to cruise much under 2000 RPM, but it works out perfectly on the highway. 2300 RPM is about 70 MPH.

Ted

[Chilibit]

No argument from me. The original poster was talking about 55-60. 4th gear is a more than fine for those speeds I think. My diff is 3.46 and I think that works pretty well with the .82.

With my somewhat meager 500 ft/lbs I prefer to have a few more RPMs if I am forced to take evasive action. I am not always fast enough to add a shift to the mix. So some of my preferences are designed to offset my shortcomings.

[Mark Brye]

[quote=Chilibit;1423987]No argument from me. The original poster was talking about 55-60. 4th gear is a more than fine for those speeds I think. My diff is 3.46 and I think that works pretty well with the .82.

I am running 373s and a 335/35/18 Nitto Drag Radial tire. Not sure what the tire height is on those tires with out looking up. And yes almost all my cruising on freeway is at 55-60 because of the speed limits...and traffic. The .64 is not fun at that speed and in 4th it's fun but gets to loud for even my "young ears" after a while.

[AC Ventura]

Originally Posted by Shootnride

Well said Dwight. I have the .64 fifth gear in mine and I love it. My motor doesn't like to cruise much under 2000 RPM, but it works out perfectly on the highway. 2300 RPM is about 70 MPH.

Ted

Hi Ted,

Is that with the 3.54 axle?

[Shootnride]

Originally Posted by AC Ventura

Hi Ted,

Is that with the 3.54 axle?

No, I have the 3.73 gears and rear tires are 26.8" O.D.

Ted